Ashcroft Pressure Switches

FEATURES

B-Series switches have proven reliablein such harsh environments as:

• Offshore oil rigs

• Chemical and petrochemical plants

• Pulp and paper mills

• Steel mills

• Power plants

•Water and sewage-treatment plants

• Other corrosive environments

B-Series Switches – Pressure, DifferentialPressure, Temperature & Hydraulic

Ashcroft Inc. supplies highly reliableAshcroft® switches and controls for indus-trial and process applications.We beginwith rock-solid designs, matching the mostappropriate technology with the safety andreliability requirements of the applications.The materials of construction are specifiedto Ashcroft’s exacting standards, and prod-uct is built to last in the toughest applica-tions. Our modern, responsive manufactur-ing facility is supported by an extensivenetwork of stocking distributors and factorysales offices located in virtually every partof the world. Special application assistanceis always just a telephone call away.The Ashcroft B-Series switch line isdesigned to satisfy most switch require-ments. Materials of construction have beenselected for long life. A wide variety of pre-cision switch elements are available tomeet every application requirement,including hermetically sealed contacts foradded reliability and safety. The actuatorswe use have been proven in more than 20years of service in the world’s plants andmills. Special designs are available for firesafety, NACE, limit control and other morestringent requirements. Simplicity andease of use are stressed to improve relia-bility of the installation.Applications include: pumps, compres-sors, washers, filters, degreasers, evapora-tors, recovery systems, food processing,ground support equipment, reverse osmo-sis systems, heat exchangers, hydraulicsystems, lubrication systems, marineequipment, textile machinery, heating andair conditioning equipment.

BULLETIN SW10

Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USATel: 203-378-8281 • Fax: 203-385-0408email: [email protected] • www.ashcroft.com

All specifications are subject to change without notice.All sales subject to standard terms and conditions.© Ashcroft Inc. 2007 10/08

ThermowellsThermowells must be used on any appli-cation where the stem of the temperatureswitch may be exposed to pressure, cor-rosive fluids or high velocity. Additionally,the use of a thermowell permits instrumentinterchange or calibration check withoutdisturbing or closing down the process.Ashcroft temperature switches havebulb diameters to match 3⁄8˝ nominal borethermowells. The bulbs have a sensitiveportion length of 2˝ which can be usedwith 21⁄2˝ “U” dimensioned thermowells orlonger. For maximum accuracy, a thermo-well’s “U” dimension should be selectedto permit complete immersion of the sen-sitive portion plus 1˝ when measuring thetemperature of liquids; an extra 3˝ shouldbe allowed when measuring the temper-ature of gases.Thermowell bushings should be usedwith remote mount temperature switches.We recommend the standard 3˝ bulb andcode 69 Series bushings for use with anythermowell “U” dimension. A split rubbergrommet allows easy installation and “S”dimension adjustment.

B-Series Switches – Pressure, Differential Pressure,Temperature & Hydraulic

BULLETIN SW10



STANDARD TEMPERATURE RANGE SELECTIONMaximumNominal Range(1) Temperature Approximate Deadband(1) Switch Element

°F °C °F 20, 26, 27 21, 24, 31 50 22 32, 42

–40 to 60 –40 to 160 400 1.0-2.0 3.0-8.0 1.5-5.5 1.4-6.0 8.0-16.00 to 100 –20 to 400 400 1.5-3.0 5.0-12.0 2.2-8.5 1.5-7.5 9.0-20.075 to 205 20 to 95 400 1.5-3.5 8.0-16.0 2.5-12.0 2.0-9.0 10.0-24.0150 to 260 65 to 125 400 1.5-3.0 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0235 to 375 110 to 190 500 1.5-3.5 5.0-12.0 2.5-8.5 2.0-9.0 10.0-24.0350 to 525(3) 175 to 275 700 2.0-4.5 8.0-16.0 3.2-12.0 2.5-10.0 15.0-34.0500 to 750(2) 260 to 400 900 4.0-8.0 16.0-30.0 7.2-24.0 5.0-23.0 30.0-50.0

1 All deadbands given in °F.2 Available with remote mount thermal systems only.3 Not available with 23⁄4˝ stem.

NOTES: 4 Dual switch element multiply single switch element value by 1.6 forapproximate deadband.

5 Set and reset points must fall within the adjustable range.

Temperature SwitchesB-Series temperature switches featurea SAMA Class II vapor pressure thermalsystem. This system provides quick,accurate response to process tempera-ture changes with negligible ambienttemperature effects. This is inherent inthe design due to the precise relation-

ship that exists between temperature andpressure according to the vapor pressurelaws. A wide selection of sensing bulband armored capillary lengths is avail-able. The vapor pressure system designfeatures small bulb sizes, making instal-lation easy and cost-effective.All models feature ±1.0% percent of

span setpoint repeatability with very highovertemperature ratings.These standard designs perform wellin applications where shock and vibra-tion could be a problem and should beused with Ashcroft thermowells for bulbprotection and ease of installation andmaintenance.


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Pressure & Differential Pressure SwitchesB-Series pressure, differential pressure and

vacuum switches use two different actuatorsdepending on setpoint require-ments. For set-points between 2 and 3000 psi, the simple,rugged diaphragm-sealed piston actuator isused. This design features high reliability andchoice of actuator seal materials for virtuallyevery application. An optional welded design isalso available for setpoints up to 1000 psi for

maximum reliability. This design is available in316 SS or Monel. Differential pressure modelsuse a unique, dual diaphragm-sealed pistondesign that features very high static operatingpressures and small size.For setpoints between 4.5 and 150 inches of

H2O, a large diaphragm is used for increasedsensitivity in both pressure and differentialpressure designs with good choice of materials

of construction.All standard models feature ±1 percent of

range setpoint repeatability and a minimum of400 percent of range proof pressures.These standard designs perform well in appli-

cations where shock and vibration could be aproblem and may be used in conjunction withAshcroft diaphragm seals in extreme servicessuch as slurries or abrasive process fluids.

Overpressure Ratings Approximate Deadband(2) Switch ElementNominal Range(1) Proof psi Burst psi 20, 26, 27 21, 24, 31 50 22 32, 42

Vacuum–30˝ Hg –760mm Hg -100 kPa 250 400 0.3-0.7 1.5-3.0 0.5-2.2 0.4-1.5 2.1-4.2

Compound–15˝ H2O/ –375mm H2O/ –3.7 kPa/ 20 35 0.15-.75/ 1.5-2.5/ 0.45-2.0/ 0.5-1.2/ 2.1-3.5/15˝ H2O 375mm H2O 3.7 kPa 0.15-.75 1.5-2.5 0.45-2.0 0.5-1.2 2.1-3.5–30˝ H2O/ –760mm H2O/ –7.5 kPa/ 20 35 0.30-.60/ 1.5-2.5/ 0.45-2.0/ 0.5-1.5/ 2.1-3.5/30˝ H2O 760mm H2O 7.5 kPa 0.30-.60 1.5-2.5 0.45-2.0 0.5-1.5 2.1-3.5–30˝ Hg/ –760mm Hg/ –100 kPa/ 0.5-1.0/ 2.0-3.0/ 0.75-2.5/ 0.7-1.8/ 2.8-4.2/15 psi 1.0 kg/cm2 100 kPa 250 400 0.3-0.7 0.5-1.5 0 .5-1.0 0.7-1.4 0.7-2.1–30˝ Hg/ –760mm Hg/ –100 kPa/ 1.0-1.5/ 3.0-6.0/ 1.2-4.5/ 1.4-2.4 4.2-8.4/30 psi 2.0 kg/cm2 200 kPa 250 400 0.3-0.8 1.0-2.0 0.7-1.5 0.4-1.3 1.4-2.8–30˝ Hg/ –760mm Hg/ –100 kPa/ 2.0-3.0/ 5.0-9.0/ 2.5-7.0/ 2.8-4.5 7.0-12.0/60 psi 4.0 kg/cm2 400 kPa 250 400 0.7-1.5 3.0-5.0 1.1-4.0 1.0-2.3 4.2-7.0

Pressure10˝ H2O 250mm H2O 2.5 kPa 20 35 0.2-0.5 1.0-2.0 0.35-1.5 0.4-1.0 1.4-2.830˝ H2O 750mm H2O 7.5 kPa 20 35 0.3-0.6 1.5-2.5 0.45-2.0 0.5-2.0 2.1-3.560˝ H2O 1500mm H2O 15 kPa 20 35 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0100˝ H2O 2500mm H2O 25 kPa 20 35 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7150˝ H2O 3750mm H2O 37 kPa 20 35 1.0-2.5 4.5-8.5 1.7-6.5 2.0-6.0 6.0-12.015 psi 1.0 kg/cm2 100 kPa 500 1500 0.1-0.35 0.5-1.5 0.2-1.0 0.4-1.0 0.7-2.130 psi 2.0 kg/cm2 200 kPa 500 1500 0.1-0.50 0.5-1.5 0.3-1.0 0.4-1.0 0.7-2.160 psi 4.0 kg/cm2 400 kPa 500 1500 0.3-1.0 1.0-3.5 0.7-2.5 0.6-2.0 1.4-5.0100 psi 7.0 kg/cm2 700 kPa 1000 3000 0.5-1.7 1.5-5.0 1.1-3.5 1.0-4.5 2.1-7.0200 psi 14 kg/cm2 1400 kPa 1000 3000 1-3 5-13 2-9 3.0-7.5 7.0-18.2400 psi 28 kg/cm2 2800 kPa 2400 3000 4-7.5 5-24 5.5-15 4.0-11.0 7.0-33.6600 psi 42 kg/cm2 4200 kPa 2400 3000 4-11 9-30 7-20 5.0-23.0 12.6-421000 psi 70 kg/cm2 7000 kPa 12000 18000 7-30 30-110 18-70 15-80 42-1543000 psi 210 kg/cm2 2100 kPa 12000 18000 15-60 80-235 37-160 30.0-230 112-329

PRESSURE/VACUUM SWITCHES

DIFFERENTIAL PRESSURE SWITCHESPressure Ratings Approximate Deadband(2) Switch Element

Static Work-Nominal Range(1) ing Pressure Proof psi 20, 26, 27 21, 24, 31 50 22 32, 42

30˝ H2O 750mm H2O 7.5 kPa 5.4 21.6 0.3-0.6 1.5-2.5 0.45-2.0 0.5-2.0 2.1-3.560˝ H2O 1500mm H2O 15 kPa 5.4 21.6 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0100˝ H2O 2500mm H2O 25 kPa 5.4 21.6 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7150˝ H2O 3750mm H2O 37 kPa 5.4 21.6 1.0-2.5 4.5-8.5 1.8-6.5 2.0-6.0 6.3-12.015 psid 1.0 kg/cm2 100 kPa 500 2000 0.5-1.0 2.0-5.0 0.7-3.5 0.7-1.4 2.8-7.030 psid 2.0 kg/cm2 200 kPa 500 2000 1.0-2.0 2.0-5.0 1.5-3.5 1.4-2.8 2.8-7.060 psid 4.0 kg/cm2 400 kPa 500 2000 2.0-4.0 3.0-6.0 3.0-4.5 2.8-5.6 4.2-8.5100 psid 7.0 kg/cm2 700 kPa 1000 4000 4.0-10.0 11.0-20.0 7.0-15.0 6.0-14.0 16.0-28.0200 psid 14.0 kg/cm2 1400 kPa 1000 4000 5.0-15.0 12.0-40.0 10.0-26.0 7.0-21.0 17.0-56.0400 psid 28.0 kg/cm2 2800 kPa 1000 8000 10.0-20.0 20.0-60.0 15.0-40.0 14.0-28.0 28.0-84.0600 psid 42 0 kg/cm2 4200 kPa 1000 8000 20.0-40.0 80.0-150.0 30.0-115.0 30.0-56.0 112.0-210.0

Values shown are for zero static working pressure.

NOTES: 1 Switches may generally be set between 15% and 100% of nominal rangeon increasing pressure. Consult factory for applications where setpointsmust be lower.

2 All deadbands are given in English units as shown in the nominal rangecolumn. Deadbands shown are for switches with Buna N diaphragm.Approximate deadbands for optional diaphragms:

Viton: Multiply Buna N value by 1.4Teflon: Multiply Buna N value by 1.2Stainless Steel: Multiply Buna N value by 1.7

Monel: Multiply Buna N value by 1.7Dual Switch Element: Multiply single switch element value by 1.6

for approximate deadband.


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B-SERIES PRESSURE AND DIFFERENTIAL PRESSURE SWITCH MODEL NUMBER:To specify the exact switch desired, select entries from appropriate tables as shown in example below.

B 4 2 0 B X P K 600 PSI

1 2 3 4 5

1 – ENCLOSUREPressure switch, Type 400, watertight enclosureB4 meets NEMA 3, 4, 4X, 13 and IP66 requirements.Pressure switch, Type 700, explosion-proof

B7 enclosure meets Div. 1 & 2, NEMA 7, 9 and IP66requirements.Differential pressure switch, Type 400, water-

D4 tight enclosure meets NEMA 3, 4, 4X, 13 andIP66 requirements.Differential pressure switch, Type 700, explosion-

D7 proof enclosure meets Div. 1 & 2, NEMA 7, 9 andIP66 requirements.

2 – SWITCH ELEMENT SELECTIONOrder Switch ElementsCode UL/CSA Listed SPDT20(7) Narrow deadband ac 15A, 125/250 Vac21 Ammonia service 5A, 125/250 Vac22(6) Hermetically sealed switch, 5A, 125/250 Vac

narrow deadband23 Heavy duty ac 22A, 125/250 Vac24(1) General purpose 15A, 125/250/480 Vac

1⁄2A, 125 Vdc1⁄4A, 250 Vdc; 6A, 30 Vdc

25(2) Heavy duty dc 10A, 125 Vac or dc,1⁄8 HP, 125 Vac or dc

26(7) Sealed environment proof 15A, 125/250 Vac27 High temperature 300°F 15A, 125/250 Vac28(5) Manual reset trip on 15A, 125/250 Vac

increasing29(5) Manual reset trip on 15A, 125/250 Vac

decreasing31 Low level (gold) contacts 1A, 125 Vac32 Hermetically sealed switch, 11A, 125/250 Vac

general purpose 5A, 30 Vdc42 Hermetically sealed switch, 1A, 125 Vac

gold contacts50 Variable deadband 15A, 125/250 Vac

UL/CSA Listed Dual (2 SPDT)61(7) Dual narrow deadband 15A, 125/250 Vac62(7) Dual sealed environment 15A, 125/250 Vac

proof63 Dual high temp. 300°F 15A, 125/250 Vac64 Dual general purpose 15A, 125/250/480 Vac

1⁄2A, 125 Vdc1⁄4A, 250 Vdc

65 Dual ammonia service 5A, 125/250 Vac67(4,6) Dual hermetically sealed 5A, 125/250 Vac

switch, narrow deadband68(4) Dual hermetically sealed 11A, 125/250 Vac

switch, general purpose 5A, 30 Vdc70 Dual low level gold contacts 1A, 125 Vac71(4) Dual hermetically sealed 1A, 125 Vac

switch, gold contacts

3 – ACTUATOR SEALRange

Code Processand Temperature Vac. 0-600 1000 3000

Material Limits °F(9) ˝ H2O psi psi psiB – Buna-N 0 to 150 • • • •V – Viton 20 to 300 • • •T – Teflon 0 to 150 • • • •S – 316L(8) 0 to 300 • •P – Monel(8) 0 to 300 • •

4 – OPTIONSUse table from page 7

5 – RANGESelect from table on page 3

NOTES:

1 Standard switch.2 Not available with psid ranges.3 Dual switches are 2 SPDT snap-action switches, not independentlyadjustable.

4 Wires cannot be terminated inside B400 switch enclosure.5 Not available with type 700 enclosure.6 Estimated dc. rating, 2.5A, 28 Vdc (notUL listed).

7 Estimated dc rating, 0.4A, 120 Vdc (not UL listed).8 Available on pressure only.9 Ambient operating temperature limits –20 to 150°F, all styles, setpointshift of ±1% of range per 50°F temperature change is normal.Switches are calibrated at 70°F reference.


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B-SERIES TEMPERATURE SWITCH MODEL NUMBER:To specify the exact switch desired, select entries from appropriate tables as shown in example below.

T 4 2 0 T 0 5 030

1 42 3

X N H

5

150° to 260°F

6

1 – ENCLOSURETemperature switch, Type 400, watertight enclosureT4 meets NEMA 3, 4, 4X, 13 and IP66 requirements.Temperature switch, Type 700, explosion-proof

T7 enclosure meets Div. 1 & 2, NEMA 7, 9 and IP66requirements.

3 – THERMAL SYSTEM SELECTIONDirect Mount

Order Code System Material Style

TS 3l6 SS RigidRemote Mount

Order Code System Material Line Length Style(9)

T05 316 SS 5´ CapillaryT10 316 SS 10´ withT15 316 SS 15´ 302 SST20 316 SS 20´ SpringT25 316 SS 25´ Armor

4 – BULB LENGTH SELECTIONDirect Mount

MinimumOrder “S” ThermowellCode Dimension “U” Dimension027(8) 23⁄4˝ –040 4˝ 21⁄2˝060 6˝ 41⁄2˝090 9˝ 71⁄2˝120 12˝ 101⁄2˝

Remote Mount030(9) 3˝ 21⁄2˝

5 – OPTIONS

Use table on page 7

6 – STANDARD TEMPERATURERANGE SELECTIONAdjustable Range

°F °C–40 to 600 –40 to 1600 to 100 –40 to 40075 to 205 20 to 95150 to 260 65 to 125235 to 375 110 to 190350 to 525 175 to 275500 to 750(2) 260 to 400

2 – SWITCH ELEMENT SELECTIONOrder Switch ElementsCode UL/CSA Listed SPDT20(7) Narrow deadband ac 15A, 125/250 Vac21 Ammonia service 5A, 125/250 Vac22(6) Hermetically sealed switch, 5A, 125/250 Vac


1⁄2A, 125 Vdc1⁄4A, 250 Vdc; 6A, 30 Vdc

25 Heavy duty dc 10A, 125 Vac or dc,1⁄8 HP, 125 Vac or dc

26(7) Sealed environment proof 15A, 125/250 Vac27 High temperature 300°F 15A, 125/250 Vac28(5) Manual reset trip on 15A, 125/250 Vac

increasing29(5) Manual reset trip on 15A, 125/250 Vac

decreasing31 Low level (gold) contacts 1A, 125 Vac32 Hermetically sealed switch, 11A, 125/250 Vac

general purpose 5A, 30 Vdc42 Hermetically sealed gold 1A, 125 Vac

contacts50 Variable deadband 15A, 125/250 Vac

UL/CSA Listed Dual (2 SPDT)61(7) Dual narrow deadband 15A, 125/250 Vac62(7) Dual sealed environment 15A, 125/250 Vac


1⁄2A, 125 Vdc1⁄4A, 250 Vdc

65 Dual ammonia service 5A, 125/250 Vac67(4,6) Dual hermetically sealed 5A, 125/250 Vac

switch, narrow deadband68(4) Dual hermetically sealed 11A, 125/250 Vac

switch, general purpose 5A, 30 Vdc70 Dual low level gold contacts 1A, 125 Vac71(4) Dual hermetically sealed 1A, 125 Vac

switch, gold contacts

NOTES:1 Standard switch.2 Available with remote mount thermal systems only.3 Dual switches are 2 SPDT snap-action switches, not independentlyadjustable.

4 Wires cannot be terminated inside T400 switch enclosure.5 Not available with Type 700 enclosure.6 Estimated dc rating, 2.5A, 28 Vdc (not UL listed).7 Estimated dc rating, 0.4A, 120 Vdc (not UL listed).8 Not available on 350 to 525°F.9 Consult factory on remote mount for bulb lengths other than 3.̋


BULLETIN SW10



B-SERIES HYDRAULIC PRESSURE SWITCH MODEL NUMBER:To specify the exact switch desired, select entries from appropriate tables as shown in example below.

H 4 2 4 V X F S 3000 PSI

1 2 3 4 5

1 – ENCLOSUREHydraulic pressure switch, Type 400, watertight

H4 enclosure meets NEMA 3, 4, 4X, 13 and IP66requirements.

2 – SWITCH ELEMENT SELECTIONOrder Switch ElementsCode UL/CSA Listed SPDT20(3) Narrow deadband ac 15A, 125/250 Vac21 Ammonia service 5A, 125/250 Vac22 Hermetically sealed switch, 5A, 125/250 Vac


1⁄2A, 125 Vdc1⁄4A, 250 Vdc; 6A, 30 Vdc

25 Heavy duty dc 10A, 125 Vac or dc,1⁄8 HP, 125 Vac or dc

26(3) Sealed environment proof 15A, 125/250 Vac27 High temperature 300°F 15A, 125/250 Vac28 Manual reset trip on 15A, 125/250 Vac

increasing29 Manual reset trip on 15A, 125/250 Vac

decreasing32 Hermetically sealed switch, 11A, 125/250 Vac

general purpose 5A, 30 Vdc42 Hermetically sealed switch, 1A, 125 Vac

gold contactsUL/CSA Listed Dual (2 SPDT)

61(3) Dual narrow deadband 15A, 125/250 Vac62(3) Dual sealed environment 15A, 125/250 Vac


1⁄2A, 125 Vdc1⁄4A, 250 Vdc

65 Dual ammonia service 5A, 125/250 Vac70 Dual low level, gold contacts 1A, 125 Vac

3 – ACTUATOR SEALCode Processand Temperature

Material Limits °F(4)

V – Viton 20 to 300 Viton O-Ring,Stainless SteelPressureConnection

4 – OPTIONSUse table from page 7

5 – STANDARDPRESSURE RANGE

Adjustable ProofRange Setpoint Pressure

psi Limits psi psi

1000 150-1000 12,0002000 300-2000 12,0003000 450-3000 12,0005000 750-5000 10,0007500 1125-7500 100,000

NOTES:

1 Standard switch.2 Dual switches are 2 SPDT snap-action switches, notindependently adjustable.

3 Estimated dc rating, 0.4A, 120 Vdc (not UL listed).4 Ambient operating temperature limits –20 to 150°F, allstyles, setpoint shift of ±1% of range per 50°F temperaturechange is normal. Switches are calibrated at 70° F reference.

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B-Series Switches – Pressure, DifferentialPressure, Temperature & Hydraulic

B-SERIES SWITCH OPTIONSAppicable Switch Series

Differential Temp-Pressure Pressure erature H

AllCode Description (psi) (in. H2O) (psi) (in. H2O) Ranges Notes

XBP Wall Mounting Bracket in. H2O • •XBX 1⁄2˝ Male NPT Bushing •XCH Chained Cover • • • • • •XC8 CSA Approval • • • • • 11XCN ATEX Directive 94/9/EC EEx d IIC T6 • • • • •XD2 Dual Seal Rating (700 Series only) • •XFM FM Approval – Single Element • • • • 17

FM Approval – Dual Element • • • • 17XFP Fungus Proofing • • • • • •XFS Factory Adjusted Setpoint • • • • • • 2XG3 Belleville Actuator • 16,17XG5 UL Limit Control to 150˝ H2O • 1, 17XG6 UL Limit Control to 600 psi • 1, 17XG7 Secondary Chamber with Vent • 13XG8 Steam Limit Control to 300 psi • 7XG9 Fire Safe Welded Actuator • 7XHS High Static Differential Pressure • 15

High Pressure, 40 psi, (static) d/p onlyXHX 160 psi (proof) d/p only • •

100 psi (proof) pressure only (˝ H2O)XJK Left Conduit Connection • • • • • • 9XJL 3⁄4˝ to 1⁄2˝ Reducing Bushing • • • • • •XJM Metric Electrical Conduit Connection

M20 x 1.5 • • • • • •XK3 Terminal Block (700 Series only) • • • • • 6XLE 6 foot Leads on the Micro Switch • • • • • •XNH Tagging Stainless Steel • • • • • •XNN Paper Tag • • • • • •XPK Pilot Light(s) Top Mounted • • • • • • 4XPM 3⁄4˝ Sealed Conduit Connection

with 16˝ Lead Wires • • • • • •XTA 316 Stainless Steel Pressure • •Connection for in. H2O RangeXTM 2˝ Pipe Mounting Bracket • • • • •XUD 316 Stainless Steel Pressure Conn. •XUX IECEx Rating (700 Series only) • • • • •

Pressure Connection:X06 1⁄2 NPT Male, 1⁄4 NPT Female • • • • 5

316 Stainless Steel (Combination)X07 1⁄2 NPTF Press. Conn., 316 SS • • • • 10X6B Cleaned for Oxygen Service • • • 3

Diaphragm Seal • • • •

NOTES:1 Buna N and Viton diaphragm.2 Advise static or working pressure for differential pressure switches.3 Buna N cannot be cleaned for oxygen service.4 N/A on 700 Series.5 Standard with 1000 and 3000 psi ranges. Bottom connection only

on DP in H2O ranges.6 Terminal Blocks standard with 700 dual switches.7 Stainless steel diaphragm only.8 Pressure connection 1⁄4 NPTF.9 Standard on 700 Series. N/A with DPDT element on 400 Series.10 N/A with Monel diaphragm.11 Standard on 400 Series.12 N/A on 3000 psi range. Available with Teflon diaphragm only.13 SS diaphragm required. Teflon diaphragm is the backup.

NEMA 7 only.14 Available in ranges vacuum to 600 psi. Not available with stainless

steel or Monel diaphragm.15 Buna N and Viton diaphragm – 15#D & 30#D only.16 24, 32, 64 or 68 element only.17 N/A on all combinations.18 700 Series only.

OPTIONAL FEATURES AND ACCESSORIES

BULLETIN SW10




4.03(102)

Ø 0.28 X 3 HOLES(7)

0.22(6)

3.32(84) 3.26

(83)

5.95(151)

1.25(32)

0.50(13)

0.14(4)

1.39(35)

2.78(71)

3.50(89)

Ø 5.12(130)

Ø 0.342 HOLES

0.36(9)

0.25(6)

(58)

1.25(32)

2.77(70)

5.62(143)

3.06(78)

2.843/4 NPT

1/4 NPTFEMALE

BRACKET WHENREQURIED “XBP”VARIATION

(72)

4.03(102) Ø 0.28 X 3 HOLES

(7)0.22

(6)

3.32(84) 3.26

(83)

6.07 (154)

1.57 (40)

0.50 (13)1.39(35)

2.78 (71)

3.50 (89)

Ø 5.12 (130)

Ø 0.342 HOLES

0.36 (9)

0.25(6)

2.27 (58)

1.25(32)

2.77(70)

5.62(143)

3.06(78)

2.96 (75)3/4 NPT

1/4 NPTFEMALE

BRACKET WHENREQURIED “XBP”VARIATION

3.32(84)

4.03(102)

0.22(6)

3.26(83)

Ø 0.28 X 3 HOLES(7)

1/4 NPTFEMALE HIGHPRESSURE PORT

H L

(58)

1.25(32)

2.77(70)

2.99(76)

0.25(6)

1.55(39)

Ø 2.31(59)

7.16(182)3/4 NPT

1/4 NPTFEMALE LOW

PRESSURE PORT

2.27

3.32(84)

0.22(6)

Ø 0.28 X 3 HOLES(7)

3.26(83)

5.68(144)

4.03(102)

2.77(70)

2.27(58)

0.25(6)

5.11(130)

2.50(64)

1.25(32)

Ø 2.31(59)

3/4 NPT

0.22 (6)

3.32(84)

3.26 (83)

0.28 (7) X 3 HOLES4.03 (102)

Ø2.31 (59)

4.61(117)

2.31

ACTIVE BULBLENGTH

(59)

2.77(70)

2.27(58)

1.25(32)

0.25(6)

3.00(76)

Ø 0.37(9)

“L”

2.50(64)

2.00(51)

3/4 NPT

Ø0.22(6)

3.32(84)

3.26 (83)

Ø 0.28 (7) X 3 HOLES

4.03 (102)

Ø2.31 (59)

4.61(117)

2.77(70)

2.27(58)

1.25(32)

0.25(6)

Ø 0.37(9)

2.00(51)

1.31(33)

2.31

ACTIVE BULBLENGTH

(59)

“S”

3/4 NPT

1/2 NPT MALE

7/8 HEX

Pressure switch – psi ranges

Temperature switch – direct mount Temperature switch – remote mount

Pressure switch – inches of water ranges

Differential pressure switch –psi differential ranges

Differential pressure switch –inches of water ranges

Dimensions – 400 Series

BULLETIN SW10




Dimensions – 700 Series

5.20(132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES(7)

1.11(28)

Ø 5.12(130)

1.93(49)

2.78(71)3.50(89)

0.36(9)

1.39(35)

6.43163

0.50(13)

0.36(9)

Ø 0.34 X 2 HOLES(9)

Ø 3.90(99)

0.03(1)

3.58(91)

0.31 (8)

5.62(143)

3.06(78)

1.22 (31)

1/4 NPT FEMALE

3/4 NPT2 HOLES

BRACKET WHENREQUIRED "XBP"VARIATION

5.20 (132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES (7)

1.93(49)

2.78 (71)

3.50 (89)

Ø 5.12 (130)

0.36 (9)0.50(13)

0.36(9)

Ø 0.34 X 2 HOLES (9)1.39(35)

6.43(163)

1.43(36)

Ø 3.90(99)

0.03(1)

3.58(91)

0.31 (8)

3.06(78)

5.62(143)

1.22 (31)

1.11(28)

1/4 NPT FEMALEHIGH PRESSURE PORT

3/4 NPT 2 HOLES

BRACKET WHENREQUIRED "XBP" VA

1/4 NPT FEMALELOW PRESSURE PORT

5.20(132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES(7)

3.09(78)

Ø 2.31(59)

1.93(49)

1/4 NPT FEMALELOW PRESSURE PORT

1/4 NPT FEMALEHIGH PRESSURE PORT

H L

Ø 3.90(99)

0.03(1)

3.58(91)

0.31(8)

7.78(198)

1.55(39)

3/4 NPT2 HOLES

1.93(49)

5.20(132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

5.73(146)

Ø 0.28 x 3 HOLES(7)

Ø 3.90(99)

0.03(1)

3.58(91)

2.31(59)

0.31(8)

1.22(31)

1/4 NPT FEMALE

3/4 NPT 2 HOLES

5.20(132)

3.61(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES(7)

2.31(59)

5.23(133)

1.93(49)

2.31

ACTIVE BULBLENGTH

(59)

Ø 3.90(99)

0.03(1)

3.58(91)

0.31 (8)

1.22 (31)

2.50(64) “L”

3.00(76)

Ø 0.37(9)

3/4 NPT 2 HOLES

5.20(132)

3.60 (91)

2.18(55)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES(7)

1.93(49)

0.32(8)

5.23(133)

2.31(59)

Ø 3.90(99)

0.03(1)

3.58(91)

0.31(8)

1.22(31)

0.37(9)

2.31

ACTIVE BULB(59)

1.31(33) “S”

1/2 NPT MALE

3/4 NPT 2 HOLES

7/8 HEX

LENGTH





Differential pressure switch –inches of water ranges

BULLETIN SW10



B700-Series Wiring Diagram

© Ashcroft Inc 2006., 250 Ea st M a in St., Str a tford, CT 06614-5145 USA, Tel: 203-378-8281, F a x: 203-385-0499, www.ashcroft.com B700-Series Wiring Diagram Dim. Dwg.

Switch Element

NC

NO

C NC

NO

C

FRONTSWITCH

REAR

SWITCH

RED BLUE WHITE

RED

BLUE

WHITE

RED

BLUE WHITE

NC

NO

C

SINGLESWITCH

SWITCH ELEMENTWIRING DIAGRAM

B4, D4, T4, B7, D7, T7

217

Consult factory for guidance in product selectionPhone (203) 385-0217, Fax (203) 385-0602 or visit our web site at www.ashcroft.com

DIFFICULT PROCESS MEDIA

When specifying pressure or temperature switches, the material in contact with media must be compatible with it. Otherwise, fail-ure could occur, resulting in leakage, injury, loss of life, property or production. The user should review prior experience with materials of construction in the process for guidance in material selection. If this is not appropri-ate, contact Customer Service for assistance. Relevant information such as process media, concentration of each constituent, tempera-ture, pressure, the presence of contaminants, particulate, vibration or pulsation is necessary to make the best recommendation.

Some applications are best handled by adding an Ashcroft diaphragm seal to isolate the fluid media from the pressure or differential pres-sure switch.

Diaphragm seals are recommended where:

• The process media being sensed could clog the pressure element.

• The process media temperature is above or below the ratings of the actuator seal materials.

• The application calls a for sanitary process connection.

Note: The addition of a diaphragm seal may increase the deadband and response time of the pressure switch to process pressure changes. Please consult Customer Service for details.

OXIDIZING MEDIA

When specifying a pressure switch for use in oxidizing media, such as chlorine, oxygen and several other chemical compounds, the wetted materials must be compatible with the media, and the switch should be cleaned for oxygen service. This is necessary to remove any residue that might react violently with the oxidizing media. Specify option X6B (clean for oxygen service).

STEAM SERVICE

In order to prevent live steam from coming into contact with the switch actuator, a siphon filled with water should be installed between the switch and the process line. We recom-mend the optional stainless steel welded pro-cess connection and diaphragm even though viton is rated for use with steam. Experience has shown that in many steam applications, the 300°F high temperature limit of viton is exceeded by steam under pressure.

In some boiler applications, a special U.L. list-ing, “MBPR,” which requires unique features is needed. Ashcroft offers these features with option XG8.

NACE

NACE is the acronym for the National Associa-tions of Corrosion Engineers. Their standard MRO175-93 titled “Sulfide Stress Cracking Resistant Metallic Materials for Oilfield Equip-ment,” is cited when ordering instruments for oilfield applications involving sour oil or gas with traces of hydrogen sulfide. It is a legal requirement in many states. NACE instruments are also suitable for use in sewage treatment plants and other applications with traces of hydrogen sulfide in the process.

For high concentrations of hydrogen sulfide in a diaphragm seal should be used; a Tanta-lum diaphragm and Hastelloy C (C276) lower housing are recommended. For over 3% or 30,000ppm, a seal is essential.

HIGH TEMPERATURE PROCESS

Refer to the actuator seal table for process temperature limits for pressure switch actua-tors. Pressure switches mounted directly to the process can withstand up to 300°F when equipped with optional viton, stainless steel or monel wetted parts. If process temperature exceeds 300°F, four feet of 1/2˝ tubing between the process and the switch will generally pro-tect the switch from damage.

Alternatively, an Ashcroft diaphragm seal, can be used to isolate the switch from the hot process.

VIBRATION

Generally, vibration will not harm Ashcroft pressure switches. However, premature trip-ping may occur under severe conditions. This tends to be annoying, but repeatable for a given situation and might be in the order of 5% to 10% of switch range from the setpoint, i.e. a 100 psi switch set at 50 psi on increasing pressure might trip somewhere between 40 and 45 psi on increasing pressure. This would not reduce the life of the pressure switch.The best approach in this type of application is to mount the switch remotely, connecting the switch to the process or equipment with flex-ible tubing. If this is not possible, consider the use of the Belleville actuator, option XG3.

PULSATION

Pressure pulsation below the range of the pressure switch will not harm it. However,

because the switch can react to pressure pulses less than one second duration, it might be desirable to include a dampening device. Several Ashcroft accessories, such as snub-bers address this situation. Consult Customer Service for more information.

MOUNTING

All Ashcroft pressure, temperature and differential pressure switches with snap acting contacts may be mounted in any position. This includes the sensing bulbs of temperature switches. This is an important advantage of snap acting switch designs.

SWITCH ELEMENT SELECTION

B-Series switches are available with a wide variety of snap acting switch elements to meet most electrical requirements. The standard contact arrangement is single pole, double throw (SPDT). This includes both normally open and normally closed contacts. Standard contact material is fine silver which generally is suitable for switching 8 volts or more, up to the rating in the Switch Element Selection Table. When switching less than 8 volts, optional Gold Alloy contacts are recommended.

Optional Dual, or 2 SPDT contacts may be sup-plied in B-Series enclosures for applications requiring two switch functions at the same setpoint. These contacts are technically not double pole, double throw (DPDT). They are synchronized at the factory to actuate within 1% of nominal range of each other. For simul-taneous actuation of 2 SPDT contacts, option XG3 should be ordered.

Additional Pressure and Temperature Switch Application Information

218


Additional Pressure and Temperature Switch Application Information

INFORMATION & GUIDELINES FOR SETTING ASHCROFT PRESSURE, TEMPERATURE AND DIFFERENTIAL PRESSURE SWITCHES

All Ashcroft pressure, temperature and dif-ferential pressure switches can be set at any point between about 15% and 100% of the range as designated on the label or the nomi-nal range table.

Ashcroft pressure and temperature switches can be either set in the field or ordered from the factory preset to your requirements. When set at the factory, the specification is ±1% of the nominal range.

Factory setting, or XFS, is a very popular option, and as a result, we often get orders that do not have enough information or have incorrect information.

HOW TO ORDER

When “XFS” is desired:

1. Setpoint must be indicated.

2. Increasing or decreasing pressure must be indicated.

Ex: B424B XFS 100# Set: 60# decreasing

3. For differential pressure switches, static operating pressure must be given also.

Ashcroft is the leader in providing pressure and temperature switches for alarm, shutdown and control in hazardous locations.

Models are available with single or dual set-points, fixed or adjustable deadbands.

Choose from standard, miniature or compact enclosures, construction of epoxy coated alu-minum or stainless steel.

HAZARDOUS LOCATIONS a. Division I.

Ashcroft 700 series or other explosion proof enclosures are required to meet the requirements of Division I Hazard-ous Locations as defined by the National Electrical Code.

b. Division II. These enclosures also meet the less strin-gent requirements for Division II Hazard-ous Locations. Alternatively, Ashcroft 400 series or other watertight enclosures, with hermetically sealed switch elements are approved for use in Division II hazardous locations.

c. Intrinsic Safety. Any Ashcroft pressure or temperature switch may be used with an approved barrier in most intrinsically safe systems. These switches do not create or store energy and are therefore designated “simple devices’’ in these systems. Exception: Ashcroft N series electronic pressure switches require power and may not be suitable for use in all intrinsically safe systems.

c. ATEX. ATEX is a European designation that deals with standards for equipment and protective systems intended for use in potentially explosive atmospheres. This approval is required for switches intended for use in hazardous locations, especially important to OEMs who export to Europe and contractors specifying or purchasing products for European applications.

215


Product Selection Information

PRESSURE, TEMPERATURE AND DIFFERENTIAL PRESSURE SWITCH SELECTION

Before making your selection, consider the following:

1. Actuator The actuator responds to changes in pressure, temperature or differential pressure and operates the switch element in response to these changes.

The actuator is normally exposed to process fluid and must therefore be chemically compatible with it. The following may be used to help select actuator type:

For nominal pressure ranges 0-15 psi through 0-3000 psi, the standard actuator is a diaphragm-sealed piston. In this actuator, process pressure acting on the piston area causes it to overcome the adjustment spring force and actuate a snap-action switch. A diaphragm and O-ring seal the process media from this mechanism. These are available in various materials, i.e.: Buna N, Teflon and Viton. The standard process connection is stainless steel. Optional monel pressure connec-tion is available.

For ̋ H2O Pressure and Differential Pressure Ranges, a diaphragm actuator is used. In this design, the standard pressure connections are carbon steel. Diaphragms are available in Viton, Buna N and Teflon. Always review process tem-perature limits before making seal selections.

Optional stainless steel pressure connections are available (option XTA).

For High Differential Pressure Actuator Ranges, 3-15 to 60-600 psid, a Dual Diaphragm-Sealed Piston Actuator is used. This actuator is designed to for high static-pressure applications. The stan-dard pressure connections are nickel-plated brass. Diaphragms are available in Viton, Buna N and Teflon. Always review process temperature limits before making seal selections. Optional stainless steel pressure connections are available (option XUD).

For all temperature ranges the standard Ashcroft® temperature actuator operates on the vapor pressure principle: the vapor pressure in a sealed thermal system is applied to a sensing element, which in turn actuates a switch. This is known as a SAMA Class II system. Various filling materials are used, including Propane, Butane, Methyl Alcohol, N Propyl Alcohol and Xylene. High overtemperature capability is possible with this type of system. The interface between liquid and vapor is the point at which sensing occurs. This is the “sensitive” portion of the bulb. Bulb extensions and capillary are normally filled with vapor, and have little effect on the setpoint, regardless of ambient temperature variations; therefore, no ambient compensation is required. For best results, the bulb should be mounted within 60 degrees of vertical to assure the liquid remains in the bulb.

2. Enclosure The enclosure protects the switch element and mechanism from the environment and has provi-sions for mounting and wiring. All Ashcroft switch enclosures are epoxy-coated aluminum or stainless steel for maximum corrosion resistance. Choose between watertight NEMA 4, 4X for most industrial applications and explosion-proof NEMA 7/9 for most process applications.

Ashcroft enclosures include watertight cover gas-kets, external mounting holes and one or two 3/4 NPT electrical conduit holes for ease of installa-tion. Pressure switches may also be mounted directly to the process by means of the standard 1/4 NPTF or optional 1/2 NPT pressure connection.

Note: When installing Ashcroft switches, refer to instruction sheets included with each switch, the National Electrical Code, and any other local codes or requirements to assure safety.

3. The Switching Function Next, consider the switching function. Most appli-cations for alarm and shutdown are satisfied by single setpoint, fixed deadband models. For high/low or alarm and shutdown, the dual setpoint models may be selected. For pump, compressor, level and other control applications, an adjustable deadband model is often the best choice.

4. The Switch Element Finally, the electrical switching element must be compatible with the electrical load being switched. For ease of selection, all electrical

216


switching elements are snap acting, SPDT (single pole-double throw), or 2 (SPDT). Select a switch element with electrical rating that exceeds the electrical rating of the device being controlled by the switch. For better reliability and safety, optional Hermetically Sealed switching elements may be specified.

ADDITIONAL SWITCH TERMINOLOGY

Accuracy – (See repeatability) Accuracy normally refers to conformity of an indicated value to an accepted standard value. There is no indication in switch products; thus, instead, the term repeat-ability is used as the key performance measure. Ashcroft switch accuracy is 1% of nominal range.

Automatic Reset Switch – Switch which returns to normal state when actuating variable (Pres-sure or Temperature) is reduced.

Adjustable or Operating Range – That part of the nominal range over which the switch setpoint may be adjusted. Normally about 15% to 100% of the nominal range for pressure and differential pressure switches and the full span for tempera-ture switches.

Burst Pressure – The maximum pressure that may be applied to a pressure switch without causing leakage or rupture. This is normally at least 400% of nominal range for Ashcroft switches. Switches subjected to pressures above the nominal range can be permanently damaged.

Deadband – The difference between the setpoint and the reset point, normally expressed in units of the actuating variable. Sometimes referred to as differential.

Division 1 – A National Electrical Code Classifica-tion of hazardous locations. In Division 1 loca-tions, hazardous concentrations of flammable gases or vapors exist continuously, intermittently or periodically under normal conditions; fre-quently because of repair or maintenance operation/leakage or due to breakdown or faulty operation of equipment or processes which might also cause simultaneous failure of electri-cal equipment. Explosion-proof NEMA 7/9 enclo-sures are required in Division 1 locations.

Division 2 – A National Electrical Code Classifica-tion of Hazardous locations. In Division 2 hazard-ous locations, flammable or volatile liquid or flammable gases are handled, processed or used, but will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown or in case of abnormal operation of equipment. Either Nema 7/9 explosion-proof enclosures or any enclosure with hermetically sealed switch contacts may be used in Division 2 locations.

Explosion Proof – A term commonly used in industry referring to enclosures capable of with-standing an internal explosion of a specified gas without igniting surrounding gases. Strict instal-lation practices in accordance with the national electrical code are also required for safety.Fixed Deadband – The difference between the setpoint and the reset point of a pressure or tem-perature switch. It further signifies that this dead-band is a fixed function of the pressure switch and not adjustable.Hermetically Sealed Switch – A switch element whose contacts are completely sealed from the environment to provide additional safety and reli-ability. Contact arc cannot cause an explosion and atmospheric corrosive elements cannot affect the contacts.Manual Reset Switch – Pressure or Tempera-ture switch in which contacts remain actuated even after the actuating variable returns to normal. On Ashcroft manual reset switches, a button must be pushed to reset the contacts.National Electrical Manufacturers Association (NEMA) – This group has defined several catego-ries of enclosures, usually referred to as “types.” Further, they designate certain features and capa-bilities each type must include. For example, among other features, a NEMA 4 enclosure must include a threaded conduit connector, external mounting provision and cover gaskets. When selecting a NEMA 4 enclosure from any manu-facturer, a buyer is assured of receiving these features.NEMA 4 – Watertight and dusttight enclosures intended for use indoors or outdoors to pro-tect the equipment against splashing, falling or hose-directed water, external condensation and water seepage. They are also sleet-resistant.NEMA 4X – Watertight, dusttight and corrosion-resistant enclosures with same qualifications as NEMA 4, but with added corrosion resistance.NEMA 7 – Enclosures for indoor Class I, Division 1 hazardous locations with gas or vapor atmospheres.NEMA 9 – Enclosures for indoor Class II, Division 1 hazardous locations with combustible dust atmospheres.Normal Switch Position – Contact position before actuating pressure (or variable) is applied. Normally closed contacts open when the switch is actuated. Normally open contacts close when the switch is actuated. Normally Closed – Refers to switch contacts that are closed in the normal switch state or posi-tion (unactuated). A pressure change opens the contacts.Normally Open Switch – Refers to the contacts that are open in the normal switch state or posi-tion (unactuated). A pressure change closes the contacts.

Overpressure Rating(s) – A nonspecific term that could refer to either burst or proof pressure, or both.

Proof Pressure – The maximum pressure which may be applied without causing damage. This is determined under strict laboratory conditions including controlled rate of change and tem-perature: This value is for reference only. Consult factory for applications where switch must oper-ate at pressures above nominal range or refer-ence temperature (70°F).

Repeatability (Accuracy) – The closeness of agreement among a number of consecutive mea-surements of the output setpoint for the same value of the input under the same operating con-ditions, approaching from the same direction, for full-range traverses. Ashcroft switch repeatabil-ity is 1% of nominal range.

Note: It is usually measured as nonrepeatabil-ity and expressed as repeatability in percent of span or nominal range. It does not include hysteresis or deadband.

Reset Point – The reset point is the Pressure, Temperature or Differential Pressure Value where the electrical switch contacts will return to their original or normal position after the switch has activated.

Setpoint – The setpoint is the Pressure, Tem-perature or Differential Pressure value at which the electrical circuit of a switch will change state or actuate. It should be specified either on increase or decrease of that variable. (See also reset point.)

Single-Pole Double Throw (SPDT) Switching Element – A SPDT switching element has one normally open, one normally closed, and one common terminal. The switch can be wired with the circuit either normally open (N/O) or normally closed (N/C). SPDT is standard with most Ashcroft pressure and temperature switches.

Snap Action – In switch terminology, snap action generally refers to the action of contacts in the switch element. These contacts open and close quickly and snap closed with sufficient pressure to firmly establish an electrical circuit. The term distinguishes products from mercury bottle types that were subject to vibration problems.

Static Pressure – For differential pressure switches, static pressure refers to the lower of the two pressures applied to the actuator.

Product Selection Information

235


NOTES:1. Switches may generally be set between 15% and 100%

of nominal range on increasing pressure. Consult fac-tory for applications where setpoints must be lower.

2. All deadbands are given in English units as shown in the nominal range column. Deadbands shown are for switches with Buna N diaphragm.

Approximate deadbands for optional diaphragms: Viton: Multiply Buna N value by 1.4 Teflon: Multiply Buna N value by 1.2 Stainless Steel: Multiply Buna N value by 1.7 Monel: Multiply Buna N value by 1.73. Available with remote mount thermal system only.

DIFFERENTIAL PRESSURE SWITCHES Overpressure Ratings Approximate Deadband(2,4) Switch Element (Buna-N Diaphragm)

Nominal Range (1) Static psi Proof psi 20, 26, 27 21, 24, 31 50 22 32, 42

30 in.H2Od 750 mmH2O 7.5 kPa 5.4 21.6 0.3-0.6 1.5-2.5 0.45-2.0 0.5-2.0 2.1-3.5 60 in.H2Od 1500 mmH2O 15 kPa 5.4 21.6 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0 100 in.H2Od 2500 mmH2O 25 kPa 5.4 21.6 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7 150 in.H2Od 3750 mmH2O 37 kPa 5.4 21.6 1.0-2.5 4.5-8.5 1.8-6.5 2.0-6.0 6.3-12.0 15 psid 1 kg/cm2 100 kPa 500 2000 0.5-1.0 2.0-5.0 0.7-3.5 0.7-1.4 2.8-7.0 30 psid 2.5 kg/cm2 200 kPa 500 2000 1.0-2.0 2.0-5.0 1.5-3.5 1.4-2.8 2.8-7.0 60 psid 4 kg/cm2 400 kPa 500 2000 2.0-4.0 3.0-6.0 3.0-4.5 2.8-5.6 4.2-8.5 100 psid 7 kg/cm2 700 kPa 1000 4000 4.0-10.0 11.0-20.0 7.0-15.0 6.0-14.0 16.0-28.0 200 psid 14 kg/cm2 1400 kPa 1000 4000 5.0-15.0 12.0-40.0 10.0-86.0 7.0-21.0 17.0-56.0 400 psid 28 kg/cm2 2800 kPa 1000 8000 10.0-20.0 20.0-60.0 15.0-40.0 14.0-28.0 28.0-84.0 600 psid 42 kg/cm2 4200 kPa 1000 8000 20.0-40.0 80.0-150.0 30.0-115.0 30.0-56.0 112.0-210.0

TEMPERATURE RANGE SELECTION Adjustable Range Max. Temp. Approximate Deadband(6) Switch Element

°F °C °F 20, 26, 27 21, 24, 31 50 22 32, 42

–40 to 60 –40 to16 400 1.0-2.0 3.0-8.0 1.5-5.5 1.4-6.0 8.0-16.0 0 to 100 –20 to 40 400 1.5-3.0 5.0-12.0 2.2-8.5 1.5-7.5 9.0-20.0 75 to 205 20 to 95 400 1.5-3.5 8.0-16.0 2.5-12.0 2.0-9.0 10.0-24.0 150 to 260 65 to125 400 1.5-3.0 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0 235 to 375 110 to 190 500 1.5-3.5 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0 350 to 525(7) 175 to 275 700 2.0-4.5 8.0-16.0 3.2-12.0 2.5-10.0 15.0-34.0 500 to 750(3) 260 to 400 900 4.0-8.0 16.0-30.0 7.0-24.0 5.0-23.0 30.0-50.0

PRESSURE/VACUUM SWITCHES Overpressure Ratings Approximate Deadband(2) Switch Element (Buna-N Diaphragm)

Nominal Range (1) Proof psi Burst psi 20, 26, 27 21, 24, 31 50 22 32, 42

Vacuum –30 in.Hg –760 mmHg –100 kPa 250 400 0.3-0.7 1.5-4.0 0.5-2.2 0.4-1.5 2.1-4.2

Compound –15 in.H2O/ –375 mmH2O/ –3.7 kPa 20 35 0.15-0.75/ 1.5-2.5/ .45-2.0/ 0.5-1.2/ 2.1-3.5/ 15 in.H2O 375 mmH2O 3.7 kPa 0.15-0.75 1.5-2.5 0.45-2.0 0.5-1.2 .2.1-3.5 –30 in.H2O –760 mmH2O/ –7.5 kPa 20 35 0.30-0.60/ 1.5-2.5/ 0.45-2.0/ 0.5-1.5/ 2.1-3.5/ 30 in.H2O 760 mmH2O 7.5 kPa 0.30-0.60 1.5-2.5 0.45-2.0 0.5-1.5 2.1-3.5 –30 in.Hg/ –760 mmHg/ –100 kPa 250 400 0.5-1.0/ 2.0-3.5/ 0.75-2.5/ 0.7-1.8/ 2.8-4.2/ 15 psi 1.0 kg/cm2 100 kPa 0.3-0.7 0.5-2.0 0.5-1.0 0.5-1.4 0.7-2.1 –30 in.Hg/ –760 mmHg/ –100 kPa 250 400 1.0-1.5/ 3.0-6.0/ 1.2-4.5/ 1.4-2.4/ 4.2-8.4/ 30 psi 2.0 kg/cm2 200 kPa 0.3-0.8 1.0-2.0 0.7-1.5 0.4-1.3 1.4-2.8 –30 in.Hg/ –760m mmHg/ –100 kPa 250 400 2.0-3.0 5.0-9.0 2.5-7.0 2.8-4.5/ 7.0-12.0 60 psi 4.0 kg/cm2 400 kPa 0.7-1.5 3.0-5.0 1.1-4.0 1.0-2.3 4.2-7.0

Pressure 10 in.H2O 250 mmH2O 2.5 kPa 20 35 0.2-0.5 1.0-2.0 0.35-1.5 0.4-1.0 1.4-2.8 30 in.H2O 750 mmH2O 7.5 kPa 20 35 0.3-0.6 1.5-2.5 4.5-2.0 0.5-2.0 2.1-3.5 60 in.H2O 1500m mmH2O 15 kPa 20 35 0.5-1.3 1.5-3.5 0.9-2.5 0.7-3.0 2.1-5.0 100 in.H2O 2500 mmH2O 25 kPa 20 35 0.6-1.6 2.5-5.5 1.1-4.0 1.0-4.0 3.5-7.7 150 in.H2O 3750 mmH2O 37 kPa 20 35 1.0-2.5 4.5-8.5 1.7-6.5 2.0-6.0 6.0-12.0 15 psi 1.0 kg/cm2 100 kPa 500 1500 0.1-.35 0.5-1.5 0.2-1.0 0.4-1.0 0.7-2.1 30 psi 2.5 kg/cm2 200 kPa 500 1500 0.1-.50 0.5-1.5 0.3-1.0 0.4-1.0 0.7-2.1 60 psi 4.0 kg/cm2 400 kPa 500 1500 0.3-1.0 1.0-3.5 0.7-2.5 0.6-2.0 1.4-5.0 100 psi 7.0 kg/cm2 700 kPa 1000 3000 0.5-1.7 1.5-5.0 1.1-3.5 1.0-4.5 2.1-7.0 200 psi 14 kg/cm2 1400 kPa 1000 3000 1-3 5-13 2-9 3.0-7.5 7.0-18.2 400 psi 28 kg/cm2 2800 kPa 2400 3000 4-7.5 5-24 5.5-15 4.0-11.0 7.0-33.6 600 psi 42 kg/cm2 4200 kPa 2400 3000 4-11 9-30 7-20 5.0-23.0 12.6-42 1000 psi (8) 70 kg/cm2 7000 kPa 12000 18000 7-30 30-110 18-70 15.0-60 42-154 3000 psi 210 kg/cm2 21000 kPa 12000 18000 15-60 80-235 37-160 30.0-130.0 112-329

4. Deadbands given are for zero static working pressure.5. For approximate deadbands for dual switch elements,

multiply the single switch element by 1.6.6. All deadbands given in °F.7. Not available with 23/4˝ stem.8. Proof pressure is 4000 psi with stainless steel and monel

welded diaphragms.

Nominal Ranges and Deadbands Pressure and Temperature Switches, B-Series

244

Consult factory for guidance in product selectionPhone (203) 378-8281 or visit our web site at www.ashcroft.com

Pressure, Differential Pressure and Temperature Switch Options

PRESSURE SWITCH OPTIOnS (all SERIES)OPTION SWITCH SERIES CODE DESCRIPTION A B L P G F N H NOTES

XBP WaII mounting bracket (˝H2O) STD STD STD

XBX 69C bushing (St. St.) Assembled to capillary. Remote Temperature only.

XCH Chained cover

XCN ATEX approval on 700 Series

XC8 CSA approval STD STD STD STD Standard on NEMA 4 enclosures. F series and A series.

XD2 Dual seal rating

XFM FM approval – Single element N/A on temperature switches. XFM FM approval – Dual element

XFP Fungus proofing

XFS Factory adjusted setpoint Setpoint must be given as well as increase or decrease.

XG3 Belleville actuator Setpoint limits reduced to 30% to 100% of range.

XG5 Gas/oil UL limit differential pressure Buna N & Viton diaphragm only. B400 & LDS single

control to 150˝ H2O setpoint only. N/A w/code 22, 32, P or J switch elements.

XG6 Gas/oil UL limit pressure control to 600 psi Buna N and Viton diaphragm only.

XG7 Special actuator with redundant seal design (SS primary diaphragm) B700 switch only. UL listed.

XG8 Steam limit pressure control to 300 psi Stainless steel or Viton diaphragm only.

XG9 Fire safe actuator Stainless steel diaphragm only.

XHS High static differential Available with Buna N and Viton diaphragms only. 15 psid and 30 psid only.

XHX 40 psi static pressure/dp only 160 psi proof pressure/dp only

100 psi proof pressure/press only

Inches of water ranges

XJK Left side conduit connection Standard on 700 series. N/A with DPDT element on 400 series.

XJL 3⁄4˝ to 1⁄2˝ conduit reducing bushing

XK3 Terminal block Terminal blocks standard with dual switches on 700 series. N/A on 400 series.

XLE 6 foot leads on the micro switch

XMD Metric range on label N7 switches only. Standard on N4.

XNH Stainless steel tagging Specify tag information.

XNN Paper tag Specify tag information.

XPJ 24 Vdc pilot light(s) – Single B, L & P Nema 4 only. XPJ 24 Vdc pilot light(s) – Dual

XPK Pilot light(s), top mounted N/A on explosion-proof enclosures.

XPM 3⁄4˝ sealed conduit connection with 16˝ lead wires STD

XRN Range scale Standard on L, G, P & F series.

XTA 316 SS pressure port(s) for in H2O ranges STD

245


Pressure, Differential Pressure and Temperature Switch Options

PRESSURE SWITCH OPTIOnS (all SERIES)OPTION SWITCH SERIES CODE DESCRIPTION A B L P G F N H NOTES

XUD 316 stainless steel diff. press. conn. STD

XUX IECEx approval (700 series)

XO6 Pressure connection: 1⁄2 NPT male, Standard with 1000, 2000 and 3000 psi ranges. 1⁄4 NPT female combination

N/A Bottom connection only on D/P ˝H2O ranges.

XO7 Pressure connection: 1⁄2 NPT female STD

X2C DPDT with single setpoint adjustment Available with LPS, LDS, LTS, GPS, GTS and GDS models.

X3A Sanitary seal approved by 3A council Select either 11/2˝ or 2˝ Tri-Clamp seal.

X6B Cleaned for oxygen service N/A with Buna N diaphragm.

Diaphragm seals

246


© Ashcroft Inc. 1/2006

PRODUCT INFORMATION

Ashcroft® Switches Page: SW/PI-62

INFORMATION & GUIDELINES FOR SETTINGASHCROFT PRESSURE, TEMPERATURE AND DIFFERENTIAL PRESSURE SWITCHES

All Ashcroft Pressure, Temperature and Differential Pressure switches can be set at any pointbetween about 15% and 100% of the range as designated on the label or the nominal rangedesignated in the catalog. In addition, L, G and P-Series adjustable deadband switches have areset point adjustment which is used to meet specific deadband requirements, such as pump,compressor or level control applications. N-Series has both setpoint and deadband adjustments toaccomplish the same thing.

XFS

All Ashcroft switch series above can be either set in the field or ordered from the factory preset toyour requirements. When we set the switch at the factory, our specification is ±1% of the nominalrange. Factory setting, or XFS, is a very popular option, and as a result, we often get orders that donot have enough information or have incorrect information. When this happens, the order isdelayed and extra phone calls are needed to resolve. The following should help you meet yourcustomers needs correctly the first time:

HOW TO ORDER

When “XFS” is shown in part number:

1. Setpoint must be indicated.

2. Increasing or decreasing pressure must be indicated.Ex: B424B XFS 100#Set: 60# decreasing

3. For differential pressure switches, static operating pressure must be given also.

COMMON XFS ORDERING ERRORS

• Indicating “XFS” with no setpoint supplied.

• Indicating setpoint without adding “XFS” to part number.

• Indicating setpoint below or beyond the capable range.

• Indicating setpoint, with no “increasing” or “decreasing”.

• Indicating setpoint, but no reset point on an adjustable deadband switch.

• Indicating 2 setpoints on a switch only capable of one setpoint.

• Ordering differential pressure switches with XFS, but without giving the static operatingpressure.

SETTING GUIDELINES BY SWITCH TYPE

Pressure (ALL) Pressure switches may generally be set between about 15% and 100% of theiroperating range on increasing pressure. Be sure that switches can also resetwithin the switch range. Refer to the approximate deadband table in the OH-1 bulletin.

For Example:

a. B424B-100 psi (According to the approximate deadband table, deadband isbetween 1.5 and 5.0 psi) this switch can be set at 15% or 15 psi, and will resetsomewhere between 10 and 13.5 psi.

However:

b. B468S-100psi (Deadband is calculated by multiplying the catalog limits by1.7 for stainless steel and 1.6 for a dual code 32, giving limits of 5.7 to 19 psi).

This switch might not reset unless it were to go into vacuum. Note: This switchcould be set on decreasing pressure, since reset would be at a higher pressure.

Temperature (All) Temperature switches may generally be set throughout their full range ortemperature span. However, you should be aware of deadbands and be surethat the process temperature can change enough to reset the switch, if theapplication requires it.

DifferentialPressure (All) Setpoint changes with changes in static operating pressure. Therefore, the

static pressure must be given when the switch is ordered. Refer to SW/PI-51“Static Working Pressure Effects On Differential Pressure Switches.”

Optional XHS actuator greatly reduces the effects of static operating pressureshifts. Refer to SW/PI-57 “High Static Operating Pressure Differential PressureSwitch.”

© Ashcroft Inc. 1/2006

SETTING GUIDELINES BY ASHCROFT PRODUCT LINE

Product Line Capability

B Single setpoint only, even on dual switch elements.Ex: B424B XFS 1000#Set: 750# Increase

Code 50 Switch Element – variable deadband element. A setpoint as well as a resetpoint must be indicated. The deadband between the these two points must not beless or greater than the deadband range listed in the approximate deadband table.

Ex: B450B XFS 100# Deadband table limits are 1.1 to 3.5 psiSet: 75# IncreaseReset: 72# Decrease

L,G,P LPS, LDS, LTS – Single setpoint, fixed deadbandGPS, GDS, GTSPPS, PDS, PTS

Ex: LPSN4GB25 XFS 200#Set: 130# on Decrease

LPD, LDD, LTD - Dual setpoints, fixed deadband on each. SetpointsGPD, GDD, GTD must be at least 5% of range apart.PPD, PDP, PTD

Ex: LPDN4GGB25 XFS 400#Set: A side 120# on DecreaseSet: B side 350# on Increase

LPA, LDA, LTA - Single setpoint, adjustable deadband. A setpointGPA, GDA, GTA and a reset point must be indicated. The deadbandPPA, PDA, PTA between these points must not be less or greater than the

deadband range listed in the approximate deadband table.Ex: LPAN4HV25 XFS 150IWSet: 145IW IncreaseReset: 90IW Decrease

L,G LPS, LDS, LTS – Single setpoint, fixed deadband(X2C Option) GPS, GDS, GTS DPDT Contacts. This option provides simultaneous

operation on either increasing or decreasing pressure forCode G switch elements when ordered with XFS only.Field adjusted switches or other switch elements willoperate within 1% of range of each other.

N NPA - Single setpoint, adjustable deadband. Deadband is adjustablebetween .1% - 95% of nominal range.

Ex: NPAN4DLS01 XFS 30#Set: 25# IncreaseReset: 7# Decrease

229


2 - SWITCH ELEMENTS Order Description/Maximum Electrical Ratings Code UL/CSA Listed SPDT 20(4) Narrow deadband 15A, 125/250 Vac 21(9) Ammonia service 5A, 125/250 Vac Hermetically sealed 22(3) switch, narrow 5A, 125/250 Vac deadband 23 Heavy duty ac 20A,125/250 Vac 15A,125/250/480 Vac 24(1) General purpose 1/2A, 125 Vdc 1/4A, 250 Vdc 25 Heavy duty dc 10A,125/ Vac or dc 1/8HP 125/ Vac or dc 26(4) Sealed environment 15A, 125/250 Vac proof 27 High temp. 300°F 15A, 125/250 Vac 31 Low level (gold) 1A,125/250 Vac contacts Hermetically sealed 32 switch, general 11A, 125/250 Vac purpose 5A, 30 Vdc 50 Variable deadband 15A,125/250 Vac UL/CSA Listed Dual SPDT(2)

61(4) Dual narrow deadband 15A, 125/250 Vac 62(4) Dual narrow environ- 15A, 125/250 Vac ment proof 63 Dual high temp. 300°F 15A, 125/250 Vac 15A,125/250/480 Vac 64 Dual general purpose 1/2A, 125 Vdc 1/4A, 250 Vdc 65 Dual ammonia service 5A,125/250/480 Vac Hermetically sealed 67(3) switch, narrow 5A, 125/250 Vac deadband Dual hermetically 68 sealed switch, 11A,125/250 Vac general purpose 5A, 30 Vdc

TO ORDER THIS B-SERIES PRESSURE SWITCH:

Select: B7 20 B X06 600# 1. Enclosure: 2. Switch Element: 3. Actuator Seal: 4. Options (see pages 238-239): 5. Pressure Range (see page 235):

This broad Ashcroft® switch series is ideal for use in virtually all pro-cess and industrial applications.• Explosion-proof NEMA 7/9, IP66

enclosure (explosion-proof enclo-sure Class I, Div. 1 & 2, Groups B, C, & D and Class II, Div. 1 & 2, Groups E, F & G)

• Choice of switch elements for all applications, including hermeti-cally sealed

• Wide choice of wetted materials, including all-welded Monel or stainless steel

• Fixed or limited adjustable deadband• UL listed• Various actuators available• Belleville actuator(8)

• Readily available• Standard pressure connection materials: Pressure psi ranges - 316L SS Differential psid ranges - Nickel plated brass(9)

Pressure and differential inches of water ranges - Epoxy coated carbon steel• ATEX models available(8)

• IECEx models available(10)

• CSA models available(8)

• FM models available(8)

• Setpoints adjustable from 15-100% of range

• Dual Seal Rating models available(8)

Pressure and Differential Pressure Switches, Explosion-Proof Enclosure, Type 700, B-Series

1 - ENCLOSUREB7 - Pressure switch, type 700, explosion-proof

enclosure meets Div.1 & 2, NEMA 7/9, IP66 requirements

D7 - Differential pressure switch, type 700, explosion-proof enclosure meets Div. 1 & 2, NEMA 7/9, IP66 requirements

ATEX APPROVAL FOR HAZARDOUS LOCATIONSATEX is a European designation that deals with standards for equipment and protective systems intended for use in poten-tially explosive atmospheres. This approval is required for switches intended for use in hazardous locations, especially important to OEMs who export to Europe and contractors specifying or purchasing products for European applications.XCN option adds special features to Ashcroft 700-Series switch enclosures that meet the requirements for the highest levels of security and danger, such as:• Special locking device requiring an Allen wrench to remove

cover• Special vents that blow out should the diaphragm rupture,

thus preventing pressure build-up in the enclosure• Special conduit plug requiring an Allen wrench for removal• Available on pressure, temperature and differential

pressure models• Meets Explosion Class EEx d IIC T6

ATEX model shown

LOOK FOR THIS AGENCY MARK ON OUR PRODUCTS

Code Process Range

& Temp.(6) Vac 0-600 1000 2000- Material Limits in.H2O psi psi 3000 °F psi B-Buna N 0 to 150

V-Viton 20 to 300

T-Teflon 0 to 150

S-SS(5)(10) 0 to 300

P-Monel(5) 0 to 300

NOTES: 1. Standard switch. 2. Dual switches are 2 SPDT snap-action switches not

independently adjustable. 3. Estimated dc rating, 2.5A, 28 Vdc (not UL listed). 4. Estimated dc rating, .4A, 120 Vdc (not UL listed). 5. Available on pressure only. 6. Ambient operating temperature limits –20 to 150°F,

all styles. Setpoint shift of ±1% of range per 50°F is normal. Switch calibrated at 70°F reference.

7. Items are wetted by process fluid. 8. Refer to Option Table. 9. Order Option XUD, stainless steel process connection.10. On differential switches, stainless steel is available in 15, 30, 60 and 90 psid ranges only. Includes Teflon O-ring and 316 SS connection.

4 - OPTIONS(See pages 238-239)

5 - STANDARD PRESSURE RANGES(See page 235)

3 - ACTUATOR SEAL(7)

LOOK FOR THIS AGENCY MARK ON OUR PRODUCTS

Note: This sheet contains information necessary for proper andsafe operation and should be read by the installer or user— DO NOT DESTROY.

Do not exceed electrical, pressure or temperature ratings onnameplates – turn off power before removing cover. Install inaccordance with National Electrical Code or other applicablespecifications. Process fluid type and temperature must becompatible with the wetted materials shown on the nameplates.

Diaphragm materials are coded in the catalog number as follows:

Example: B420 BB – BunaV – Viton

Other wetted materials are AISI 316 Stainless Steel.

This sheet should be used in conjunction with instruction 250-2246 entitled “Installation and Maintenance B400 and B700Series Ashcroft® Snap-Action Switches for Pressure Control.”B400 and suffix XG6, snap-action switches are used on air,natural gas, LP gas and Numbers 1, 2 and 6 fuel oil at tempera-tures to 240°F, to a maximum pressure of 600 psi.

INSTALLATION

See references to B400 series on 250-2246 for installation andelectrical connections. The suffix XG6 switches are provided witha 1⁄8 NPT vent for the attachment of a line when required. If thisvent is not connected to a line it should be plugged to prevent theentrance of foreign matter. All XG6 controls have the left conduithole plug sealed at the factory.

ADJUSTMENT OF SETPOINT

A single setpoint adjustment nut is located centrally at the bot-tom on the inside of the enclosure. XG6 controls have a setpointindication scale located adjacent to the adjusting nut. To adjustthe control, align the top of the adjusting nut hex with the indica-tor line on the scale. Do not force adjustment or attempt toexceed maximum setting shown on the scale nameplate.

After installation of the control replace cover to insure electricalsafety and to protect internal parts from the environment.

Installation and Maintenance Instructions for ASHCROFT® Type B400XG6 & B700XG6 SeriesSnap-Action Switches for Medium Pressure

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10028-10/00 (250-2430B) AMR 7/07

Installation and Maintenance Instructions for ASHCROFT® Type B400XG8Snap-Action Switches

Note: This sheet contains information necessary for proper andsafe operation, and should be read by the installer or user– DO NOT DESTROY.

Do not exceed electrical, pressure or temperature ratings onnameplates – turn off power before removing cover. Install inaccordance with National Electrical Code or other applicablespecifications. Process fluid type and temperature must becompatible with the wetted materials shown on the nameplate.

Diaphragm material is coded in the catalog number as follows:

Example: B420S (S-AISI 316 Stainless Steel)

This sheet should be used in conjunction with instruction 250-2246 entitled “Installation and Maintenance B400 and B700Series Ashcroft Snap Action Switches for Pressure Control.”B400 Suffix XG8, snap action switches are for use on steam toa maximum pressure of 300 psi.

INSTALLATION

See reference to B400 series on 250-2246 for installation andelectrical connections. The suffix XG8 switches must be usedwith a properly rated siphon at least 7 inches in length to lowerthe temperature of the steam in contact with the operatingmechanism of the switch. The effect of a siphon may be accom-plished by a coiled flexible line between the manifold and switchpressure port or by the use of a manufactured siphon similar tothe Ashcroft 1⁄4 1098 series. All XG8 controls have the leftconduit hole plug sealed at the factory.

ADJUSTMENT OF SETPOINT

A single setpoint adjustment nut is located centrally at the bot-tom on the inside of the enclosure. XG8 controls have a setpointindication scale located adjacent to the adjusting nut. To adjustthe control, align the top of the adjusting nut hex with the indica-tor line on the scale. Do not force adjustment or attempt toexceed maximum setting shown on scale or nameplate.

After installation of the control, replace cover to insure electricalsafety and to protect parts from the environment.

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10032-10/00 (250-2396-B) GBE 4/06

Installation and Maintenance Instructions for B400 & B700 ASHCROFT® Snap Action Switches for Pressure Control

INTRODUCTIONThe Ashcroft pressure switch is a precision built agencyapproved control device which features a mechanical snapaction switch. Controllers are available for operation on pressureor vacuum with fixed or variable differential. Also manual resettypes for operation on increasing or decreasing pressure. Themanual reset types remain tripped until reset by pressing a but-ton on top of the enclosure. Standard electrical switch is SPDT,

available with various electrical characteristics. Two SPDT switchelements mounted together are available except on variableDeadband and manual reset types. Various wetted material con-structions for compatibility with a range of pressure media maybe obtained.

The Ashcroft snap action pressure switch is furnished in thestandard NEMA 4 and explosion-proof NEMA 7 & 9 enclosurestyles. Both enclosures are epoxy coated aluminum castings.

4.03(102)

Ø 0.28 X 3 HOLES(7)

0.22(6)

3.32(84) 3.26

(83)

5.95(151)

1.25(32)

0.50(13)

0.14(4)

1.39(35)

2.78(71)

3.50(89)

Ø 5.12(130)

Ø 0.342 HOLES

0.36(9)

0.25(6)

2.27(58)

1.25(32)

2.77(70)

5.62(143)

3.06(78)

2.843/4 NPT

1/4 NPTFEMALE

BRACKET WHENREQURIED “ XBP”VARIATION

(72)

3.32(84)

0.22(6)

Ø 0.28 X 3 HOLES(7)

3.26(83)

5.68(144)

4.03(102)

2.77(70)

2.27(58)

0.25(6)

5.11(130)

2.50(64)

1.25(32)

Ø 2.31(59)

3/4 NPT

B400

B700

5.20(132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

Ø 0.28 x 3 HOLES(7)

1.11(28)

Ø 5.12(130)

1.93(49)

2.78(71)3.50(89)

0.36(9)

1.39(35)

6.43163

0.50(13)

0.36(9)

Ø 0.34 X 2 HOLES(9)

Ø 3.90(99)

0.03(1)

3.58(91)

0.31 (8)

5.62(143)

3.06(78)

1.22 (31)

1/4 NPT FEMALE

3/4 NPT2 HOLES

BRACKET WHENREQUIRED "XBP"VARIATION

1.93(49)

5.20(132)

3.62(92)

2.18(55)

0.32(8)

4.37(111)

1.37(35)

5.73(146)

Ø 0.28 x 3 HOLES(7)

Ø 3.90(99)

0.03(1)

3.58(91)

2.31(59)

0.31(8)

1.22(31)

1/4 NPT FEMALE

3/4 NPT 2 HOLES

1.8 lb

(.81 kg)

2.7 lb

(1.2 kg)

2.7 lb

(1.2 kg)3.6 lb

(1.6 kg)

STANDARD RANGES15, 30, 60, 100, 200, 400, 600 psi1000, 3000 psi30˝Hg vac.-0

STANDARD RANGES10, 30, 60, 100, 150 ˝H2O15˝H2O vac.-15˝H2O

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10008-10/00 (250-2246E) AMR 12/07

INSTALLATIONThese controls are precision instruments and should never beleft with internal components exposed. During installation insurethat covers are in place and conduit openings are closed exceptwhen actually working on the control.

MOUNTING B400 AND B700 SERIESThree holes external to the enclosure for surface mounting.Location of these holes is shown on the general dimensiondrawing. They may also be mounted directly on pressure lineusing the pressure connection. When tightening control to pres-sure line, always use the wrench flats or hex on the lower housing.

ELECTRICAL CONNECTIONSRemove coverB400 Series – two screws hold cover to enclosureB700 Series – cover unscrews

CONDUIT CONNECTIONSNote – It is recommended that Teflon tape or other sealant beused on conduit, bushing or plug threads to ensure integrity ofthe enclosure.

B400 Series standard – one 3⁄4˝ NPT conduit hole right side.B700 Series standard – two 3⁄4˝ N PT conduit holes with onepermanent plug. NEMA 7 & 9 enclosures require proper conduitseals and breathers as per the National Electrical Code.

B400 & B700 Series – XJL variation – two 3⁄4˝ NPT conduitholes with two 3⁄4˝ to 1⁄2˝ NPT reducing bushings.B400 Series – XJK variation – two 3⁄4˝ NPT conduit holes.

B400 SERIESSPDT – Wire directly to the switch according to circuit require-ments. On controls with pilot lights wire lights according to circuitdiagram on inside of cover. See special wiring instruction tag forsingle switches with two pilot lights and dual switches with oneor more lights.

2 SPDT – Dual switching elements consist of two SPDT switchesmounted together in a bracket. Switches are calibrated to havesimultaneous operation within 1% of range either on increasingor decreasing pressure but not in both directions. Wire directly tothe front and rear switch according to circuit requirements.Leads are provided on rear switch color coded as follows:Common – WhiteNormally Closed – RedNormally Open – Blue

See SPDT instructions for pilot light hook-up.

When hermetically sealed switch elements(s) are supplied, thelead color coding is as follows:Common – WhiteNormally Closed – RedNormally Open – Blue

B700 SERIESSPDT – Wire directly to the switch according to circuit requirements.2 SPDT – Wire to front switch terminal block (left) and rearswitch terminal block (right) as marked. Strip insulation 5⁄16˝,insert in proper terminal connector and tighten clamping screwto secure.

ADJUSTMENT OF SETPOINTB400 & B700 Series – A single setpoint adjustment nut (7⁄8˝) islocated centrally at the bottom on the inside of the enclosure.

For accurate setpoint calibration, mount the switch on a cali-bration stand, a pump or catalog No.1305 deadweight gaugetester. A suitable reference standard such as an AshcroftDuragauge or Test Gauge is necessary to observe convenientchanges in pressure.

As received, the pressure switch will normally be set toapproximately 90% of the indicated range. Pressurize thesystem to required setpoint and turn the adjustment nut untilswitch changes mode. Direction of turning is indicated on a labelaffixed to the inside of the control enclosure. When setpoint hasbeen achieved raise and lower pressure to insure that setpointis correct.

After installation of the control replace cover to insure electri-cal safety and to protect internal parts from the environment.

B450 and B750 VARIABLE DEADBAND SWITCHESDeadband is varied by rotating the wheel on the precisionswitch. When viewed from the front of the enclosure, rotation tothe left increases deadband – rotation to the right decreasesdeadband. Letters on the wheel may be used as a reference.Deadbands obtainable will vary from 0.5% to 9% of pressurerange depending on range segment and type of diaphragm.

ADJUSTMENT OF SETPOINTAs received, the pressure switch will normally be set to approxi-mately 90% of range. Rotate the wheel on the MICRO SWITCHall the way to the right; this will provide smallest deadband.Pressurize the system to the required setpoint and turn theadjustment nut until the switch changes mode. Lower thepressure to reset the switch. Rotate the wheel on the MICROSWITCH until the desired deadband is obtained. The uppersetpoint will be changing upward with this adjustment. Lower thepressure to reset the switch. Then increase the pressure to thedesired setpoint and turn the adjusting nut until the switchchanges mode. Lower the pressure and check resetpoint anddeadband.

Note – As indicated above, adjustment of setpoint is made byuse of 7⁄8˝ nut. Precision switch element mounting screwsand bracket adjusting screw are factory sealed andshould not be tampered with.

Installation and Maintenance Instructions for B400 & B700 ASHCROFT® Snap Action Switches for Pressure Control

TERMINAL BLOCK

SWITCH A

TERMINAL BLOCK

SWITCH B

2

1

3

2

1

3

NC

NOC

NC

NO

C

Note – Since vacuum models are already above setpoint atatmosphere, the Normally Open (NO) circuit will beclosed as received.

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10008-10/00 (250-2246E) AMR 1/07

INSTALLATION REQUIREMENTS• To minimize the risk of injury, the switch enclosure must be

selected according to the area classification and installedaccording to the required safety and electrical codes.

• Before operating the switch all conduit entries and/or junctionboxes need to be closed according to the required safety andelectrical codes.

• To attain the degree of protection listed on the switch it maybe necessary to add required conduit fittings.

• The switch must be protected from moisture, shock and/orextreme vibration.

• The ambient temperature limits for switches are –20 to 150°F,(–28 to 65°C).

CAUTIONS• Always install the cover after wiring the switch and before

power is supplied.• Before removing the cover in hazardous areas be sure there

is no explosive atmosphere present and the power supply isturned off.

• For ATEX approved switches all safety locking devices andelectrical earthing must be installed or connected beforeoperating.

• Never carry a temperature switch by holding only the stem,bulb or capillary.

• Do not exceed ranges, current and/or voltage limits.• The protection degree of the switch is only valid when the

switch is installed in accordance with all safety and electricalcodes and regulations.

CLEANING• Never use aggressive solvents.• Do not use high pressure water to clean the switch.

MAINTENANCE/TROUBLESHOOTING• All Ashcroft switches require little or no maintenance.• Be sure that the case is closed at all times.• When the switch is exposed to process media that may hard-

en and/or build up in the pressure port, the switch should beremoved and cleaned as needed.

• If the switch does not function, only trained and skilled per-sonnel should check on the wiring, power supply and/ormounting.

• If the problem can not be solved, please contact one of theAshcroft affiliates or distributors.

ELECTRICAL CONNECTIONS• Only trained and skilled personnel are allowed to install the

wires to the electrical terminals of the switch.• Cable couplers, glands and conduit connectors must have the

correct electrical approvals.• Always follow safety and electrical regulations when connect-

ing these devices.• The system ground of the device is marked with a green

colored screw and/or by the ground symbol.• ATEX approved switches have an external ground screw that

must be connected.• Micro switch terminals and wire color codes:

NO (Normally Open) BlueNC (Normally Closed) RedC (Common) WhiteGround Green (F-Series only)

MICRO SWITCH CODE ELECTRICAL RATING

Single Dual Single Dual Vac Vdc

K KK 20 61 15A, 250V 0.4A, 120VW WW 21 65 5A, 250V 6A, 30VP PP 22 67 5A, 250V 2.5A, 28VC N/A 23 N/A 22A, 250VG GG 24 64 15A, 480V 0.25A, 250VS N/A 25 N/A 10A, 125V 10A, 125VF FF 26 62 15A, 250V 0.4V, 120VY YY 27 63 15A, 250VU UU 28 N/A 15A, 250V 6A, 30VE EE 29 N/A 15A, 250V 6A, 30VM MM 31 70 1A, 125V 50mA, 60VJ JJ 32 68 11A, 250V 5A, 30VL LL 42 71 1A, 125V

N/A N/A 50 N/A 15A, 250VH HH 35 N/A 10A, 250V 0.25A, 250V

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10030-10/00 (250-3136) AMR 5/07

Installation and Maintenance Instructions for CE Mark on ASHCROFT®

Switches/Low Voltage Directive 73/23/EEC

TABLE 1: MICRO SWITCH ELECTRICAL RATINGS

Installation and Maintenance Instructions forASHCROFT® Type B700XD2 & D700XD2 & P-SeriesSnap Action Switches with Dual Seal Rating

Note: This sheet contains information necessary for proper andsafe operation and should be read by the installer or user. DONOT DESTROY.

Do not exceed electrical, pressure or temperature ratings onName plates – turn off power before removing electrical cover.Install in accordance with National Electrical Code or otherApplicable specifications. Process fluid type and temperaturemust be compatible with the wetted materials shown on thenameplates.

The Ashcroft® dual diaphragm pressure actuator is designed tomeet the requirements of ANSI/ISA-12.27.01-2003 for processsealing between electrical systems and flammable or com-bustible process fluids. The testing for the Dual Seal Rating wasdone by CSA and is part of CSA File LR 55541

© 2009 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10171-09/09

OPERATIONThe basic Ashcroft pressure switch actuator consists of a sens-ing piston of a specific area exposed to process pressure. Thepressure on this area creates a force, which is opposed by aspring until the set point is reached, at which point the switchactuates. Various area piston and springs are used to get thedifferent ranges we offer.

The dual diaphragm design consists of a primary or sensingdiaphragm as described above and a secondary or redundantseal diaphragm. In the unlikely event that the primarydiaphragm ruptures, the secondary diaphragm preventsprocess fluid from entering the switch enclosure. A vent is pro-vided to annunciate a primary seal failure.

Caution: The vent must not be used or blocked; gas leakagemay not be visible.

For inches of water ranges the D700, PDA, PDD and PDS switches are used as pressure switches not differential switches. The Hconnection is used as the process input and the L connection as the vent.

Test/Internal Pressure

Atmospheric Pressure

Test/Internal Pressure

Atmospheric Pressure

Vent

ProcessConnection Spring Lower

Housing

UpperHousing

PrimaryDiaphragm Plate

PrimaryDiaphragm Seal

FastenerAssembly

SecondaryDiaphragm

Vent

PrimaryDiaphragm

Vent

B, V, & T Actuators S or P Actuators

The XD2 option for B700, PPA, PPD and PPSswitches in the ranges of 15 psi to 600 psi.

Installation and Maintenance Instructions for B700 ASHCROFT® Snap Action SwitchesATEX Directive 94/9/EC EEx d IIC T6;SIRA 02ATEX1391

© Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax; 203-385-0408, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M009-10120-10/02 ATEX GBE 11/06

1. Installation Requirements• Ambient Temperature: –20 to 60°C• Process Temperature: –20 to 60°C

Other temperature limits are possible with differentdiaphragm materials

• Refer to appropriate datasheet for materials of constructionand technical information.

• These controls are precision instruments and should neverbe left with internal components exposed. During installationinsure that covers are in place and conduit openings areclosed except when actually working on the control.

• To minimize the risk of injury, the control must be installedaccording to the required safety and electrical codes.

• To attain the degree of protection listed on the switch it maybe necessary to add required conduit fittings.

• The switch must be protected from moisture, shock and/orextreme vibration.

• Mounting position: Switch can be mounted in any position. It isrecommended that unit be set in intended operating poistion.

2. Cautions• Always install the cover after wiring the switch and before

power is supplied.• Before removing the cover in hazardous areas be sure there

is no explosive atmosphere present and the power supply isturned off.

• For ATEX approved switches all safety locking devices andelectrical earthing must be installed or connected beforeoperating.

• Never carry a temperature switch by holding only the stem,bulb or capillary.

• Do not push any foreign objects (ex. Screwdrivers) againstthe diaphragm.

• Do not exceed ranges, current and/or voltage limits.3. Mounting• Three holes external to the enclosure for surface mounting.

Location of these holes is shown in the general dimensiondrawing.

• Units may also be mounted directly on the pressure lineusing the pressure connection. When tightening control topressure line, always use the wrench flats or hex on thelower housing.

4. Electrical Connections• Before operating the switch all conduit entries and/or junction

boxes need to be closed according to the required safety andelectrical codes.

a) Standard product has two 3⁄4 NPT conduit holes with onepermanent plug. 3⁄4 NPT conduit holes can be modified or reduced with ATEX approved adapters.

b) Available ATEX approved cable glands can be used.• It is recommended that Teflon tape or other sealant be used

on conduit, bushing, gland or plug threads to ensure integrityof the enclosure.

5. Cleaning• Never use aggressive solvents.• Do not use high-pressure water to clean the switch.

6. Maintenance/Troubleshooting• All ASHCROFT switches require little or no maintenance.• Be sure that the case is closed at all times.• When the switch is exposed to process media that may hard-

en and/or build up in the pressure port, the switch should beremoved and cleaned as needed.

• If the switch does not function, only trained and skilled per-sonnel should check on the wiring, power supply and/ormounting.

• If the problem cannot be solved, please contact one of theDresser affiliates or distributors.

7. Electrical Connections• Only trained and skilled personnel are allowed to install the

wires to the electrical terminals of the switch.• Cable couplers, glands and conduit connectors must have

the correct electrical approvals.• Always follow safety and electrical regulations when connect-

ing these devices.• The system ground of the device is marked with a green col-

ored screw and/or by the ground symbol.• ATEX approved switches have and external ground screw

that must be connected.• Micro switch terminals and wire color codes:

TERMINAL BLOCKFRONT SWITCH

TERMINAL BLOCKREAR SWITCH

NC

NO

C

NC

NO

C

MICRO SWITCH CODE ELECTRICAL RATING

Single Dual Single Dual Vac Vdc

K KK 20 61 15A, 250V 0.4A, 120V

W WW 21 65 5A, 250V

P PP 22 67 5A, 250V 2.5A, 28V

C N/A 23 N/A 22A, 250V

G GG 24 64 15A, 480V 0.25A, 250V

S N/A 25 N/A 10A, 250V 10A, 250V

F FF 26 62 15A, 250V 0.4A, 120V

Y YY 27 63 15A, 250V

U UU 28 N/A 15A, 250V

E EE 29 N/A 15A, 250V

M MM 31 70 1A, 250V 50mA, 60V

J JJ 32 68 11A, 250V 5A, 30V

L LL 42 71 1A, 125V

N/A N/A 50 N/A 15A, 250V

H HH 35 N/A 10A, 250V 0.3A, 250V

TABLE 1: MICRO SWITCH ELECTRICAL RATINGS



NO (Normally Open) BlueNC (Normally Closed) RedC (Common) White

• SPDT – Wire directly to the switch according to circuitrequirements.

• 2 SPDT – Wire to front switch terminal block (left) and rearswitch terminal block (right) as marked. Strip insulation 5⁄16˝,insert in proper terminal connector and tighten clampingscrew to secure.

8. Adjustment of SetpointNote – As indicated below, adjustment of setpoint is made byuse of 7⁄8˝ nut. Precision switch element mounting screws andbracket adjusting screw are factory sealed and should not betampered with.B700 Series – A single setpoint adjustment nut (7/8”) is locat-ed centrally at the bottom on the inside of the enclosure.For accurate setpoint calibration, mount the switch on a cali-bration stand, a pump or catalog No. 1305 deadweight gaugetester. A suitable reference standard such as an ASHCROFTDuragauge or Test Gauge is necessary to observe convenientchanges in pressure.As received, the pressure switch will normally be set toapproximately 90% of the indicated range. Pressurize thesystem to required setpoint and turn the adjustment nut untilswitch changes mode. Direction of turning is indicated on alabel affixed to the inside of the control enclosure. When set-point has been achieved raise and lower pressure to insurethat setpoint is correct.After installation of the control replace cover to insure electri-cal safety and to protect internal parts from the environment.Note – Since vacuum models are already above setpoint atatmosphere, the Normally Open (NO) circuit will be closed asreceived.D700 Series – A single setpoint adjustment nut (7⁄8˝) is locatedcentrally at the bottom on the inside of the enclosure.The direction of turning is indicated on a label affixed to theinside of the control enclosure.A typical calibration procedure would be as follows:

Static Working Pressure - 600 psigAdjustable Differential Range - 5/200 psidDifferential Setpoint - 150 psi above static

working pressure.Simultaneously raise the high and low side pressure to 600psig. Maintain the low side pressure at 600 psig. Raise thehigh side pressure to 750 psig to obtain 150 psi differential.Turn the adjustment nut until the switch changes mode at 150psi differential. When the setpoint has been achieved, raiseand lower the high side pressure to ensure that the differentialsetpoint is correct.D700 Series (low range differential) – A single setpointadjustment nut (7⁄8˝) is located centrally at the bottom on theinside of the enclosure.The direction of turning is indicated on a label affixed to theinside of the control enclosure. XG5 controls have a setpointindication scale adjacent to the adjustment nut. To adjust thecontrol, align the top of the adjustment nut hex with the indica-tor line on the scale. Do not force adjustment or attempt to

exceed the maximum setting shown on the scale or name-plate.For accurate setpoint calibration or for controls without a scalemount the control on a calibration stand so that the HIGH andLOW pressures expected under operating conditions may beobtained. Suitable reference standards are necessary for eachpressure.Note – Due to the sensitivity of these controls it is imperativethat the LOW pressure side volume be large to prevent a set-point shift between calibration and field installation. If this isnot possible, an approximate setpoint under operating condi-tions can be obtained by setting the operating point with thelow side open to atmosphere. A final setpoint adjustment canbe made after installation.Apply LOW pressure. Then apply HIGH pressure to therequired setpoint and turn the adjustment nut until the switchoperates. When the setpoint has been achieved, raise andlower HIGH pressure to ensure that the differential pressurebetween the HIGH and LOW pressures is correct.After installation of the control, replace the cover to ensureelectrical safety and to protect the internal parts from theenvironment.T700 Series – A single setpoint adjustment nut (7⁄8˝) is locatedcentrally at the bottom on the inside of the enclosure.The bulb of the control should be immersed in a bath at thedesired setpoint temperature. Optimum performance will beobtained if the bulb is fully immersed. Allow five minutes for ini-tial stabilization.As received, the temperature switch will normally be set toapproximately 90% of the indicated range. After stabilization,turn the adjustment nut until switch changes mode. Direction ofturning is indicated on a label affixed to the inside of the con-trol enclosure. When setpoint jas been achieved raise andlower temperature to insure that the setpoint is correct.After installation of the control replace cover to insure electri-cal safety and to protect internal parts from the environment.B750, D750 and T750 Variable Deadband Switches –Deadband is varied by rotating the wheel on the precisionswitch. When viewed from the front of the enclosure, rotationto the left increases deadband – rotation to the right decreas-es deadband. Letters on the wheel may be used as a refer-ence. Deadbands obtainable will vary from 0.5% to 9% ofpressure or temperature range depending on range segmentand type of diaphragm.Adjustment of Setpoint – As received, the switch will normal-ly be set to approximately 90% of range. Rotate the wheel onthe MICRO SWITCH all the way to the right; this will providesmallest deadband. Pressurize, or increase bath temperature,to the required setpoint and turn the adjustment nut until theswitch changes mode. Lower the pressure to reset the switch.Rotate the wheel on the MICRO SWITCH until the desireddeadband is obtained. The upper setpoint will be changingupward with this adjustment. Lower the pressure to reset theswitch. Then increase the pressure to the desired setpoint andturn the adjusting nut until the switch changes mode. Lowerthe pressure and check resetpoint and deadband.




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(164) (133) (98) (31) (8) (101) (71) (130) (78) (145) (89)

3.6 lb

(1.6 kg)



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1/4 NPTLOW PRESSUREINLET

1/4 NPT HIGHPRESSURE

INLET

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3.6 lb

(1.6 kg)

Differential pressure switch – inches of water ranges

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2.31 (59)ACTIVEBULBLENGTH

Ø 3/8 (9mm)

D

4.5 lb

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(1.2 kg)



Documents

Ashcroft Pressure Switches