Bulletin B-30

Series DH3 Digihelic® Differential Pressure Controller

Specifications - Installation and Operating Instructions

DWYER INSTRUMENTS, INC. Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

2

SPECIFICATIONSService: A r and non-combust b e, compat-

b e gases.

Wetted Materials: Consu t factory.

Housing Material: D e cast a um num

case and beze .

Accuracy: ±1.5% for 0.25˝ and ±0.25˝ w.c.

ranges. Ranges 0.5˝ to 5˝ w.c. and corre-

spond ng b -d rect ona (except ±2.5˝ w.c.):

±1%; A other ranges: ±0.5% @ 77°F

(25°C) nc ud ng hysteres s and repeatab -

ty (after 1 hour warm-up).

Stability: < ±1% per year.

Pressure Limits: Ranges

≤ 2.5˝ w.c.: 25 ps ; ±2.5˝, 5˝ w.c.: 5 ps ;

10˝: w.c. 5 ps ; 25˝ w.c.: 5 ps ; 50˝ w.c.: 5

ps ; 100˝ w.c.: 9 ps .

Temperature Limits: 32 to 140°F (0 to

60°C).

Compensated Temperature Limits: 32 to

140°F (0 to 60°C).

Thermal Effects: 0.020%/°F (0.036/°C)

from 77°F (25°C). For 0.25˝ and ±0.25˝

w.c. ranges: ±0.03%/°F (±0.054%/°C).

Power Requirements: 12-24 VAC/VDC.

Power Consumption: 3 VA max.

Output Signal: 4-20 mA DC nto 900

ohms max.

Zero & Span Adjustments: Access b e v a

menus.

Response Time: 250 ms (dampen ng set

to 1).

Display: Back t 4 d g t LCD 0.4˝ he ght

LED nd cators for set po nt and a arm sta-

tus.

Electrical Connections: 15 p n ma e h gh

dens ty D-Sub connect on. 18˝ (46 cm)

cab e w th 10 conductors nc uded.

Process Connections: 1/8˝ fema e NPT.

S de or back connect ons.

Mounting Orientation: Mount un t n vert -

ca p ane.

Size: 5˝ (127 mm) O.D. x 3-1/8˝ (79.38

mm).

Weight: 1.75 bs. (794 g).

Agency Approvals: CE.

SWITCH SPECIFICATIONSSwitch Type: 2 SPDT re ays.

Electrical Rating: 1 amp @ 30 VAC/VDC.

Set Point Adjustment: Adjustab e v a key-

pad on face.

DIMENSIONS

(4) 6-32 HOLESEQUALLY SPACED ON A

5-1/8 (130.18) B.C.PANEL MOUNTING

1/8 FEMALE NPT LOWPRESSURE CONNECTION

1/8 FEMALE NPT HIGHPRESSURE CONNECTION

2-1/16(52.39)

2(50.80)

1-1/4(31.75) ø4-47/64

(120.25)Ø5

(127.00)

Ø4 (101.60)FACE

5-1/2 (139.70) O.D.MOUNTING RING

5/8 (15.88)PANEL MAX

2-1/2(63.50)

3/16(4.76)

1/8 FEMALE NPT HIGHPRESSURE CONNECTION

1/2(12.70)

1-9/32(32.54)

11/16(17.46)

30°

1-3/4(44.45)

1/2 (12.70)

11/16(17.46)

1/8 FEMALE NPT LOWPRESSURE CONNECTION

(3) Ø3/16 (4.77) HOLES EQUALLYSPACED ON A 4-1/8 (104.78) B.C.SURFACE MOUNTING

INSTALLATIONLOCATION: Se ect a c ean, dry ocat on free from shock and v brat on where temperature

m ts w not be exceeded. D stance from the transm tter to the rece ver s m ted on y by

tota oop res stance. See ELECTRICAL CONNECTIONS. Tub ng feed ng pressure to the

nstrument can be pract ca y any ength requ red, but ong engths w ncrease response

t me s ght y.

POSITION: A standard mode s are ca brated for use n a vert ca mount ng pos t on.

H gher range mode s w perform proper y at other ang es but shou d be spanned and

zeroed n the pos t on n wh ch they w be used. Because of the r sens t v ty to grav tat on-

a forces, mode s w th ranges under 1˝ w.c. (25.4 mm w.c.) must a ways be mounted ver-

t ca y.

PRESSURE CONNECTIONS: For nsta at on conven ence two sets of 1/8˝ fema e NPT

pressure ports are supp ed. Be sure to sea the unused ports w th p pe p ugs nc uded.

Positive Pressure - Connect tub ng to HIGH PRESSURE port and vent LOW PRESSURE

port to atmosphere.

Negative (Vacuum) Pressure - Connect tub ng to LOW PRESSURE port and vent HIGH

PRESSURE port to atmosphere. (When operat ng th s dev ce n a dusty env ronment,

nsta an opt ona A-331 F ter Vent P ug n the vented port to keep nter or c ean.)

Differential Pressure - Connect tub ng from the h gher source to HIGH PRESSURE port

and from the ower source to LOW PRESSURE port.

3

1-1/2[38.1]

5/16[7.94]

11/16[17.46]

3/4[19.05]

1-3/32[27.78]

1-3/4[44.45]

1/2 [12.70]

(3) Ø3/16 [4.77] HOLES EQUALLYSPACED ON A 4-1/8 [104.78] B.C.

Ø1/2 [12.70] HOLE FORLOW PRESSURE CONNECTION

Ø1/2 [12.70] HOLE FORHIGH PRESSURE CONNECTION

Fig. A

4

MOUNTING: The DH 3 may be e ther pane (f ush) mounted or surface mounted.

Panel Mounting - Cut a 4-13/16˝ or 122 mm d ameter ho e n the pane and nsert the un t

from the front. S p on the mount ng r ng w th the stepped s de fac ng rear. Next, f t the snap

r ng nto the narrow groove at back edge of beze . Thread four (6) 32 x 1-1/4˝ mount ng

screws nto tapped ho es n mount ng r ng and set t aga nst snap r ng. T ghten screws

aga nst rear of pane . See F g. B.

Surface Mounting - Dr (3) 3/16˝ (4.76 mm) d ameter ho es for mount ng and cut a 9/16˝

x 1-1/2˝ (14.3 x 38.1 mm) open ng for access to term na b ock as nd cated n F g. B. If rear

pressure connect ons are to be used, a so prov de 1/2˝ d ameter ho es as shown n F gs.

A and C. Insert 6-32 mach ne screws from rear of mount ng surface, thread nto tapped

ho es on back of transm tter and t ghten.

Fig. B

Fig. C

Ø4-3/4 [120.65] HOLE

PNEUMATICPRESSURE TAP

SNAP RINGGROOVE

WIRING The DH 3 uses a standard 15 p n ma e h gh dens ty D-Sub connector ava ab e from

most e ectron c d str butors. A pre-w red 18˝ cab e s nc uded w th each un t.

See be ow tab e for cab e co or w r ng nformat on.

NOTES:1. If 12-24 VDC power s used, the po a rty s un mportant.

2. W re n accordance w th an equ va ent nat ona standard or code. Use copper conduc-

tors on y rated for 60°C.

3. A term na s are rated CLASS 2.

4. ISOLATION: A nputs and outputs to each other: 500 VAC.

5. 4-20 mA Transm tter – Check the spec f cat ons for the dev ce rece v ng th s s gna for

nput res stance. Typ ca 250 to 600 OHMS, 600 OHMS max mum.

5

Function

12-24 VAC/VDC Power

12-24 VAC/VDC Power

4-20mA XMTR Output -

4-20mA XMTR Output +

SP1 Relay N/O

SP1 Relay Com

SP1 RELAY N/C

SP2 or ALarm Relay N/O

SP2 or ALarm Relay Com

SP2 or ALarm Relay N/C

15 PIN ConnectorTerminal1

6

2

11

12

13

14

15

10

5

Cable Color

Brown

Yellow

Black

Red

Vilolet

Grey

White

Blue

Green

Orange

6

SP/AL

MENU

E

RST

HomePosition FunctionSequences the d sp ay

through SET POINT and

ALARM sett ngs

A ows access to the menus

D sp ays fu sca e

range of un t

C ears or resets an A arm

(a arm set for manua reset)

Main Menu Function

Return to home

pos t on

Return to home

pos t on

Sequences through

menus

Sequences through

menus

Enter nto SUB MENU

Sub Menu Function

Return to home pos t on

Return to prev ous menu

Increments a va ue

Decrements a va ue

Changes a va ue or

sett ng. Press ENTER and

d sp ay w b nk. Adjust

w th UP or DOWN arrows.

Press ENTER to store.

D sp ay w stop b nk ng.

Peak/Va ey SUB 

MENU resets d sp ay to

present va ue.

SP/AL

MENU

UP

ARROW

DOWN

ARROW

ENTER

RESET

KEY FUNCTIONS

INWCINWC

1.0001.000

1SP1 SP2 ALHIALLO

SP/ALSP/AL RSTRST

MENUMENU EE

X1KX1K

FRONT PANEL

ALARMDESCRIPTOR

UNITS

INPUT VALUE

MULTIPLIERDESCRIPTOR

VISABLE WITHSOME VELOCITY

AND FLOWRANGES

SP2 DESCRIPTOR

SP1 DESCRIPTOR

7

SETTING SET POINTS AND ALARMS

The hot key prov des d rect access to the Set Po nt and A arm MENU. The Set

Po nt and A arm MENUS that are d sp ayed are based upon the Contro (CtrL) SUB

MENU.

SP/AL SP/AL LSP/AL

LSP/AL LSP/AL SP/AL

SP/AL SP/AL

LSP/AL LSP/AL SP/AL

SP/AL SP/AL

Visible when

V Visible when

V Visible when

mode =

mode =

mode =

CO O OCONTROL MODE CO O ODCONTROL MODECO O OCONTROL MODE

SET POINT ADJUSTMENTAdjust ng the DH® 3 Set Po nts s qu ck and s mp e. Instead of sett ng a set po nt and dead-

band, s mp y adjust SP1H or SP2H for the des red re ay turn on po nt, and then adjust SP1Lor SP2L for the des red re ay turn off po nt.

PRESSUREPRESSURE

00

00 TIMETIME

0.20.2

0.40.4

0.60.6

0.80.8

1.0

(in. w.c.)

In the above graph, an nstrument w th a 1.0˝ range wou d have the SP1 re ay turn on at

0.8˝ and off at 0.4˝. SP1H sets the re ay turn on po nt, and SP1L sets the re ay turn off po nt.

The re ays outputs norma y funct on n the d rect act ng mode, wh ch means the re ays turn

on w th an ncrease n pressure. SP1 may be conf gured to act as a reverse act ng re ay

(refer to the 1SP SUB MENU sett ng, page 15). When set for reverse act ng, SP1H sets the

re ay turn OFF po nt, and SP1Lsets the re ay turn ON po nt. SP2 s a ways d rect act ng.

SP/AL

8

MENU MAPMENU MAP

CO U DCONTINUED

SETTINGSSETTINGSMAIN MENUS SUB MENUS

MENUS

UNAVAILABLE

FOR

BI-DIRECTIONAL

RANGES AND

RANGES ABOVE

25 IN. W.C.

E

MENU

9

CONTINUEDCONTINUED

SETTINGSSETTINGSMAIN MENUS SUB MENUS

0PEn

E

MENU

10

MAIN MENUS SUB MENUS SETTINGS

Menus present only

in pressure operation

E

EMENU

11

Main Menu Selections (Upper Right Display Reads MENU )

SECr Secur ty - Lock out access to Set Po nt and A arm sett ngs, or ock out access to

a sett ngs.

OPEr Operat on - Se ect on of Pressure, Ve oc ty or F ow and correspond ng eng neer ng

un ts.

OUt Output - Se ect a S ng e Set Po nt, 2 Set Po nts, or a Set Po nt and an A arm

mode of operat on.

d.S D sp ay - Mon tor and adjust d sp ay re ated sett ngs: Peak, Va ey, d sp ay reso-

ut on, % output and dampen ng.

AdU Advanced funct ons - Mod fy advanced funct on parameters, transm tter output

sca ng, Ma ntenance Set Po nt sett ngs and ca brat on.

12

MAIN MENUS and SUB MENUS

SECr (Security) MAIN MENU

SECr s the on y SUB MENU n the secur ty MENU. When the secur ty SUB MENU

s se ected, the present secur ty eve s d sp ayed n the upper r ght hand d sp ay. To

change the secur ty eve , adjust the number d sp ayed to the number shown n the

fo ow ng tab e for the des red secur ty eve .

The password va ues shown n the tab e cannot be a tered, so reta n a copy

of these pages for future reference.

OPEr (Operation) MAIN MENU

The OPEr MENU se ects the measurement type of the nstrument.

The SUB MENUS are:

PrES - Pressure KFAC - K Factor XDIM - X D mens on

UEL - Ve oc ty ArEA - Area YDIM - Y D mens on

FLO - F ow DIA - D ameter

If the nstrument s set for Ve oc ty, the OPEr MENU w have an add t ona KFAC SUB

MENU. If the nstrument s set for F ow, the OPEr MENU w have add t ona KFAC and

ArEA SUB MENUS. These w be d scussed under Ve oc ty and F ow. When scro ng

through the OPEr SUB MENUS, the measurement type the un t s current y set for w

show the un ts n the upper r ght d sp ay. The other measurement types w have a b ank

upper r ght d sp ay.

Security LevelDisplayed

1

2

3

4

Access

A menus access

Menu Access

SP/AL Locked

SP/AL Access

Menus Locked

A sett ngs ocked

Password Valueto Enter10

70

90

111

Units visible, so unit

is presently set to

measure pressure

is presently set to

measure pressure

Units not visibleUnits not visible Units not visibleUnits not visible

13

PrES (Pressure) SUB MENU

For pressure measurement, the fo ow ng un ts are ava ab e:

Table 1 Pressure Range vs. Available Units

INWC.1000

.2500

.5000

1.000

2.500

5.000

10.00

25.00

50.00

100.0

FTWC

.2083

.4167

.8333

2.083

4.167

8.333

MMWC2.540

6.350

12.70

25.40

63.50

127.0

254.0

635.0

1270

2540

CMWC.2540

.6350

1.270

2.540

6.350

12.70

25.40

63.50

127.0

254.0

PSI

.1806

.3613

.9032

1.806

3.613

INHG

.1839

.3678

.7356

1.839

3.678

7.356

MMHG.1868

.4671

.9342

1.868

4.671

9.342

18.68

46.71

93.42

186.8

MBAR.2491

.6227

1.245

2.491

6.227

12.45

24.91

62.27

124.5

249.1

PA24.91

62.27

124.5

249.1

622.7

1245

2491

6227

KPA

.1245

.2491

.6227

1.245

2.491

6.227

12.45

24.91

HPA.2491

.6227

1.245

2.491

6.227

12.45

24.91

62.27

124.5

249.1

OZIN

.1445

.2890

.5780

1.445

2.890

5.780

14.45

28.90

57.80

UEL (Velocity) SUB MENU

For ve oc ty measurement, the fo ow ng un ts are ava ab e:

SFPM - Standard feet per m nute

M/S - Meters per second

Table 2 Available Velocity Ranges

NOTE: A r ve oc ty and f ow read ngs are based upon standard dry a r cond t ons w th an

amb ent temperature of 70°F and a barometr c pressure of 29.92 INHG.

INPUT RANGEINWC0 - 0.1

0 - 0.25

0 - 0.5

0 - 1

0 - 2.5

0 - 5

0 - 10

0 - 25

SFPMRANGE0 - 1266

0 - 2002

0 - 2832

0 - 4004

0 - 6332

0 - 8954

0 - 12.66 x IK

0 - 20.02 x IK

M/S RANGE0 - 6.431

0 - 10.17

0 - 14.39

0 - 20.35

0 - 32.17

0 - 45.48

0 - 64.33

0 - 101.7

INWC - Inches of water co umn

FTWC - Feet of water co umn

MMWC - M meters of water coumn

CMWC - Centmeters of water coumn

PSI - Pounds per square nch

INHG - Inches of mercury

MMHG - M meters of mercury

MBAR - M bar

PA - Pasca

KPA - K opasca s

HPA - Hectopasca s

OZIN - Ounce nches

NOTE: OVFL(over f ow) or UnFL(under f ow) w appear when the ranges have been

exceeded above or be ow fu sca e by 2%.

14

FLO (Flow) SUB MENUFor f ow measurements the fo ow ng un ts are ava ab e:

SCFM - Standard cub c feet per m nute

M^3H - Cub c meters per hour

FLO r (Flow Range) SUB MENULO - 99.99 x 1K f ow range

HI - 999.9 x 1K f ow range

Tab es 3-6 show the f ow ranges ava ab e, and the max mum duct s ze that can be set

for each nput range.

Table 3 FLOr = LO Maximum Duct Size (English)

RANGEIN WC

0.1

0.25

0.5

1

2.5

5

10

25

SCFMRANGE

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

MAX. DUCTSIZE, SQ.FT.78.9

49.9

35.3

24.9

15.7

11.1

7.8

4.9

KFAC SUB MENU

KFAC K Factor - becomes access b e f the nstrument s set for Ve oc ty or F ow.

When the DH3® s used w th a P tot tube, the manufacturer may spec fy a K

Factor. The adjustment range s 0.01 to 2.00. The factory sett ng s 1.

Table 4

FLOr = HI Maximum Duct Size (English)

RANGEIN WC

0.1

0.25

0.5

1

2.5

5

10

25

SCFMRANGE

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

MAX. DUCTSIZE, SQ.FT.789.8

499.5

353.1

249.7

157.9

111.7

78.9

49.9

Table 5 FLOr = LO Maximum Duct Size (Metric)

RANGEIN WC0.1

0.25

0.5

1

2.5

5

10

25

Mˆ3/HrRANGE99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

99.99 x 1K

MAX. DUCTSIZE Mˆ24.32

2.73

1.93

1.37

0.86

0.61

0.43

0.27

Table 6 FLOr = HI Maximum Duct Size (Metric)

RANGEIN WC0.1

0.25

0.5

1

2.5

5

10

25

M3/HrRange999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

999.9 x 1K

MAX. DUCTSIZE, M2

43.19

27.31

19.3

13.64

8.63

6.10

4.31

2.73

15

ArEA, DIA, XDIM and YDIM SUB MENUS

These SUB MENUS become access b e f the nstrument s set for f ow. When measur ng

f ow, the area of the duct must be spec f ed. Tab es 3 and 4 show the nput range vs max-

mum f ow and duct s ze. For a rectangu ar duct the max mum s ze s spec f ed n square

feet or meters. For a c rcu ar duct the max mum s ze s spec f ed as the d ameter. X, Y and

c rcu ar d mens ons are entered n feet w th 0.01 foot reso ut on for FLOr = LO and 0.1 foot

reso ut on for FLOr = HI, or entered n m meters w th 1 m meter reso ut on.

ArEA - Area, se ect CIR for a c rcu ar duct or RECT for a rectangu ar duct. If a

c rcu ar duct s se ected, the DIA SUB MENU w be act vated. If a rectangu ar duct

s se ected, the XDIM and YDIM SUB MENUS w be act vated.

DIA - D ameter, enter the d ameter of a duct

XDIM - Enter the “X” d mens on of a duct

YDIM - Enter the “Y” d mens on of a duct

OUt (Output) MAIN MENU

The OUt MENU se ects the output type of the nstrument. The SUB

MENUS are:

CtrL- Contro type ALrE - A arm reset, manua or auto

ISP - SP1 reverse or d rect act ng AL.H - A arm nh b t

AL - A arm type ALDL - A arm de ay

Y

X

16

0

100

Pro

cess

Reverse Acting

Time

SPH

SPL

Relay Inactive

Relay Active

CtrL (Control) SUB MENU

1SP - S ng e set po nt

2SP - Two fu y ndependent set po nts

SPAL - S ng e set po nt and a arm

1SP (SP1 Reverse or Direct Acting) SUB MENU

DIR - D rect. Re ay turns on w th ncreas ng pressure

REV - Reverse. Re ay turns on w th decreas ng pressure

0

100

Pro

cess

Direct Acting

Time

SPH

SPL

Relay Inactive

Relay Active

17

The fo ow ng a arm funct on SUB MENUS are act vated when CtrL s set to SPAL:

AL (Alarm Type) SUB MENU

HI - H gh a arm

LO - Low a arm

HILO - For a h gh/ ow guardband type a arm

ALARM ADJUSTMENTA arm sett ngs are dependent upon the se ected a arm mode. The DH3® d fferent a pres-

sure contro er a arm may be conf gured as a H gh A arm, Low A arm, or H gh/Low A arm.

A arm sett ngs are a abso ute and may be set to anywhere w th n the range of the nstru-

ment. The dead bands of the a arms are f xed at 1% of fu sca e.

MIN. PRESSURE MAX. PRESSURE

ALHI

Relay OFF Relay ON

HIGH ALARM FUNCTION

MIN. PRESSURE MAX. PRESSURE

ALLO

Relay ON Relay OFF

LOW ALARM FUNCTION

MIN. PRESSURE MAX. PRESSURE

ALLO

Relay ON Relay OFF Relay ON

HIGH/LOW ALARM

FUNCTION

ALHI

18

AL0S (Alarm Output State) SUB MENU

CL0S - A arm re ay contacts c ose upon a arm cond t on

0PEN - A arm re ay contacts open upon a arm cond t on

ALrE (Alarm Reset) SUB MENU

ONOF - Automat c reset

HOLD - Manua reset. An a arm s reset by the RESET key on the front

pane , or an externa reset sw tch.

AL.H (Low Alarm Inhibit) SUB MENU

ON - A arm nh b t s on

OFF - A arm nh b t s off

If AL.H s se ected ON, a ow a arm cond t on s suspended upon power up unt the

process va ue passes through the a arm set po nt once.

ALDL (Alarm Delay) SUB MENU

Sets the amount of t me an a arm cond t on must be cont nuous y met before

the a arm cond t on s recogn zed. The a arm de ay s adjustab e from 0-3600

seconds.

d.S (Display) MAIN MENU

PEAK - Peak va ue rESO - Reso ut on

VALy - Va ey va ue Pd.S - Process d sp ay

ZERO - Zero DAMP - Dampen ng eve

PEAK (Peak) SUB MENU

The Peak feature stores the h ghest pressure read ng the nstrument has measured

s nce the ast reset or power up. At power up PEAK s reset to the present pressure

read ng. To manua y reset the PEAK va ue, press the RESET key wh e n the PEAKSUB MENU.

VALy (Valley) SUB MENU

The va ey feature stores the owest pressure read ng the nstrument has measured

s nce the ast reset or power up. At power up VALy s reset to the present pressure

read ng. To manua y reset the VALy va ue, press the RESET key wh e n the

VALy SUB MENU.

19

rESO (Resolution) SUB MENU

The DH 3 s capab e of d sp ay ng four d g ts of reso ut on. However, at very ow

pressures the nstab ty of the pressure may cause f uctuat ons n the east

s gn f cant d g t caus ng the east s gn f cant d g t to be of tt e va ue.

Three d g t reso ut on (3DIG) can on y be act ve when there s at east one d g t to the

r ght of a dec ma .

3DIG - Set d sp ay for 3 d g t reso ut on

4DIG - Set d sp ay for 4 d g t reso ut on

Pd.S (Process Display) SUB MENU

STD - D sp ay reads pressure, ve oc ty, or f ow va ues

PCT - D sp ay reads % of fu sca e va ue

When the d sp ay s read ng percent, PCT s d sp ayed n the upper r ght of the

d sp ay. The percent d sp ay s on y ava ab e n pressure operat on.

DAMP (Dampening) SUB MENU

Adjust from 1-16

Dampen ng stab zes the d sp ay from nstab t es due to th ngs such as v brat on and

excess ve pressure f uctuat ons. The dampen ng sett ng adjusts the amount of

read ngs that are averaged for each d sp ay update. Adjust the dampen ng va ue unt

the d sp ay reads a stab e va ue for the app cat on.

AdU (Advanced) MAIN MENUPOL - Process output ow ZERO - Zero ca brat on

POH - Process output h gh SPAN - Span ca brat on

MSP1 - Ma ntenance set po nt 1

MSP2 - Ma ntenance set po nt 2

POL and POH (Process Output Low and High) SUB MENUS

Th s feature s used n pressure operat on on y.

Process output ow and h gh are used to sca e the 4-20 mA output. Set POL to the

des red d sp ay read ng for 4mA output, and set POH to the des red d sp ay read ng

for 20 mA output. POH must be h gher than POL. POL may be adjusted 2% BELOW

m n mum sca e up to POH. POH may be adjusted from POL to 2% ABOVE max mum

sca e.

MSP1 and MSP2 (Maintenance Set Point 1 & 2) SUB MENUS

Adjust for the desired maintenance set points when the unit is placed in the

maintenance mode. The deadband is fixed at 2% of full scale. To enter or

leave the maintenance mode, press and hold the for 8 seconds.

ZERO and SPAN (Calibration of Zero and Span) SUB MENUS

The lower display reads CAL in this mode.

ZERO CalibrationNOTE: For accurate calibration, DO NOT apply any pressure when

performing this function.

With the display reading ZERO, press the ENTER key. The upper display will

blink. Press ENTER again to complete the zeroing of the instrument or press

the MENU key to cancel.

SPAN CalibrationWith the display set to SPAN, apply full scale pressure to the unit. Press the

ENTER key. The upper display will blink. Press ENTER again to complete the

calibration or press the MENU key to cancel.

SP/ALSP/AL

©Copyright 2012 Dwyer Instruments, Inc. Printed in U.S.A. 2/12 FR# 443555-00 Rev.3

DWYER INSTRUMENTS, INC. Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

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