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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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