Seven Steps to Selecta Pressure Gauge
Pressure Gauge Options
B ULLETIN G703/08 7.5M BP
4. MEDIA / WETTED PARTSThe wetted parts of the pressure gauge, the Bourdon tube and socket must be compatible with the process media. If not compatible with the wetted parts of the gauge, corrosion will occur. Corrosion of gauge wetted parts will eventually cause gauge failure and possibly safety issues. When the gaugewetted parts are not compatible with the process media, a diaphragm should be considered.
7. PRESSURE RANGESASME B40.100 recommends that normal operating pressure be con�ned to 25%-75% of the scale. If pulsation is present in the process, maximum operating gauge pressure should not exceed 50% of the full-scale range. CONCLUSIONTo properly select a pressure gauge, consider the gauge process, range, environment, accuracy, dial size, connection and mounting requirements.
3. CASE STYLE / MATERIALEnvironmental considerations include ambient temperature, air-borne particulate, condensation, humidity, water and chemicals, all of which can a�ect gauge performance. Ambient temperature may a�ect the accuracy and integrity of the gauge. Gauges are available either temperature compensated or non-temperature compensated. Ambient conditions may require that the gauge be isolated from temperature extremes. When required, the gauge should be isolated fromtemperature extremes with a �exible line assembly.When ambient conditions are corrosive, contain a large number of particulate or if the gauge will be exposed to a wet or humid environment like humidity, wash-downs or rain, specify a gauge that is weatherproof/hermetically sealed or liquid �lled.
1. ACCURACYFor a mechanical pressure gauge, accuracy is de�ned as a percentage of the full-scale range. While requirements di�er from one industry to another, the following are general guidelines:• Test Gauges and Standards: 0.25% through 0.10% full scale accuracies.• Critical Processes: 0.5% full scale accuracy.• General Industrial Processes: 1.0% accuracy. Less Critical Commercial Uses: 2.0% accuracy.
Refer to ASME B40.100 or the DIN speci�cations for more information on accuracy.
2. DIAL SIZEPressure gauge dial sizes range from 11⁄2˝ to 16˝ diameters. Generally, readability requirements, space limitations and required gauge accuracy determine dial size. Accuracies of 0.25% or 0.5% generally have dial sizes of 41⁄2˝ or larger since more dial graduations are required.
5. CONNECTION SIZEGauges are available with a variety of connections including NPT, DIN, JIS, BSP & SAE. Process pressure gauges with 41⁄2˝ dial sizes or larger are most often supplied with a 1⁄2˝ NPT connection to best support the gauge. Factors to consider when selecting a pressure gauge connection include process pressures, gauge size and weight, space limitations, leak integrity, and past experience.
6. CONNECTION LOCATIONConsider the following mounting options when selecting a pressure gauge:• Stem mount lower connect• Wall/surface mount lower connect• Panel mount back connect• U-clamp �ush mount back connect, for panel mounting• Front �ange �ush mount back connect, for panel mounting
TEST
GAU
GES
1008
S
GENE
RAL
SERV
ICE
SPEC
IAL
SER
VICE
1005
/100
0SE
RIE
S
1009
(41 / 2
,̋6˝)
1009
(21 / 2
,̋31 / 2˝
)
PRO
CESS
GAU
GES
CODE DESCRIPTION PRESSURE GAUGE TYPE
STAINLESS STEEL CASE INDUSTRIAL GAUGESTEST & PROCESS GAUGES COMMERCIAL GAUGES
NOTES: The options listed above are only a partial listing. For other options on these or other pressure instruments please call the factory for availability.(1) Available on 40mm and 50mm.(2) Excludes type 1259.
Not all variations available for each size, connection, range in a specific gauge, model/type; minimums may apply
XLL PLUS! ™ PerformanceXSF FlutterGuard™ STDXNP Nickel Plated SocketXBF WaII mounting bracketXFW Back flangeXFF Front flangeXUC U-clamp STDXLJ Dry liquid-fillable gaugeXOS Overload stop STD STD STD(1)
(2)
XVS Underload stop STD STD STD(1)
XTS Throttle screwXT(2) Throttle plug STDXS4 Slotted link movement (decrease)XRJ Slotted link (increase)XAP Adjustable pointerXMP Micrometer pointer STD STD STDXSH Red set hand stationaryXEO Red set hand adjustableXEP Maximum pointerXEQ Minimum pointerXPD Plastic window STD STD(1) STD STD STD STD STD STDXSG Safety glassXMG Metric version gaugeXDA Dial markingXNN Paper tagXNH Stainless steel tagXAB Absolute pressureXAJ 1⁄2% optional accuracy STDXAN 1% optional accuracy STD STD STDXRA Retard scaleXWN White dial STD STD STD STD STD STD STD STD STDXBD Black dialX6B Oxygen-cleaned gauges (gaseous)XTB Tip bleedXED High and low electric contactsXEE Double high-electric contactsXEF Double low-electric contactsXEG Electric contacts off at low or
high and in-betweenXGV Silicone-filled gaugeXGX Halocarbon-filled gaugeXCH Carrying handleXC4 Calibration Chart
1490
/149
5SE
RIE
S
1008
A/30
05/3
005P
1007
P
1005
/100
0SE
RIE
S
1100
1T
3-2-3%
2-1-2% 1.0%
0.25%0.5%
(800) 576 - 6308www.ashcroft-usa.comDistributed By Inc,
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3In
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3.5
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4In
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4.5
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6In
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T5500T65001008S10091109101010171220
1020S10381339
1150H1122118711881189149014951125
1125A55035509112711281130113111321133113410321036
1001T1005
1005P1005S1000
1007P1008A2071A3005
3005P12MFX/15MFX12DDG/15DDG
23DDG40DDG/50DDG
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ACCURACY
Seven Steps to Pressure Gauge Selection
DIAL SIZE CASESTYLE MATERIAL RANGEPROCESS MEDIA
(GAUGE WETTED PARTS)CONNECTION
SIZECONNECTION
LOCATION
MODELNUMBER
DIF
FERE
NTI
ALGA
UGES
COM
MER
CIAL
GAUG
ESST
AIN
LESS
STEE
LCA
SE&
IND
USTR
IAL
GAUG
ESPR
OCE
SSGA
UGES
TEST
GAUG
ES
SANITARYGAUGES
NOTE: Some model numbers may not be available in all sizes, ranges and connections.
PRODUCTCATEGORY
BULLETIN G7
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