Bulletin B-30
®
Series DH3 Digihelic® Differential
Pressure Controller
Specications - Installation and Operating Instructions
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
dwyer-inst.com
e-mail: info@dwyermail.com
DIMENSIONS
(4) 6-32 HOLES
PRESSURE CONNECTION
Y
SURFACE MOUNTING
2-1/16
[52.39]
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1/8 FEMALE NPT LOW
PRESSURE CONNECTION
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Die cast aluminum case and bezel.
Accuracy: ±1.5% for 0.25 in and ±0.25 in w.c. ranges. Ranges 0.5 in to 5 in w.c. and corresponding bidirectional
(except ±2.5 in w.c.): ±1%; All other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1
hour warm-up).
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5˝, 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.:
5 psi; 100 in w.c.: 9 psi.
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 in w.c. ranges: ±0.03%/°F
(±0.054%/°C).
Power Requirements: 12-24 VAC/VDC.
Power Consumption: 3 VA max.
Output Signal: 4 to 20 mA DC into 900 ohms max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (dampening set to 1).
Display: Backlit 4 digit LCD 0.4˝ height LED indicators for set point and alarm status.
Electrical Connections: 15 pin male high density D-Sub connection. 18˝ (46 cm) cable with 10 conductors
included.
Process Connections: 1/8˝ female NPT. Side or back connections.
Mounting Orientation: Mount unit in vertical plane.
Size: 5˝ (127 mm) O.D. x 3-1/8˝ (79.38 mm); For -SS Bezel: 4-3/4˝ (120.7 mm) O.D. x 2-21/32˝ (67.5mm).
Weight: 1.75 lbs. (794 g).
Agency Approvals: CE.
[50.80]
1-1/4
[31.75]
2-1/2
[63.50]
1/8 FEMALE NPT LOW
EQUALLY SPACED ON A
2
ø4-47/64
[120.25]
5/8 [15.88]
PANEL MAX
3/16
[4.76]
1/2
[12.70]
1-9/32
[32.54]
5-1/8 (130.18) B.C.
PANEL MOUNTING
Ø5
[127.00]
5-1/2 [139.70] O.D.
MOUNTING RING
11/16
[17.46]
11/16
[17.46]
Ø4 [101.60]
FACE
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
30°
1-3/4
[44.45]
1/2
[12.70]
(3) Ø3/16 [4.77] HOLES EQUALL
SPACED ON A 4-1/8 [104.78] B.C.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 1 amp @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via keypad on face.
INSTALLATION
(3) Ø3/16 [4.77] HOLES
LOW PRESSURE CONNECTION
LOCATION: Select a clean, dry location free from shock and vibration where temperature limits will not be
exceeded. Distance from the transmitter to the receiver is limited only by total loop resistance. See ELECTRICAL
CONNECTIONS. Tubing feeding pressure to the instrument can be practically any length required, but long lengths
will increase response time slightly.
POSITION: All standard models are calibrated for use in a vertical mounting position. Higher range models will
perform properly at other angles but should be spanned and zeroed in the position in which they will be used. Because
of their sensitivity to gravitational forces, models with ranges under 1 in w.c. (25.4 mm w.c.) must always be mounted
vertically.
PRESSURE CONNECTIONS: For installation convenience two sets of 1/8˝ female NPT pressure ports are supplied.
Be sure to seal the unused ports with pipe plugs included.
Positive Pressure - Connect tubing to HIGH PRESSURE port and vent LOW PRESSURE port to atmosphere.
Negative (Vacuum) Pressure - Connect tubing to LOW PRESSURE port and vent HIGH PRESSURE port to
atmosphere. (When operating this device in a dusty environment, install an optional A-331 Filter Vent Plug in the
vented port to keep interior clean.)
Differential Pressure - Connect tubing from the higher source to HIGH PRESSURE port and from the lower source
to LOW PRESSURE port.
1-1/2
[38.1]
5/16
[7.94]
11/16
[17.46]
Ø1/2 [12.70] HOLE FOR
HIGH PRESSURE CONNECTION
3/4
[19.05]
1-3/32
[27.78]
Ø1/2 [12.70] HOLE FOR
Figure A
1-3/4
[44.45]
1/2 [12.70]
EQUALLY SPACED ON
A 4-1/8 [104.78] B.C.
MOUNTING: The DH3 may be either panel (ush) mounted or surface mounted.
APS
SNAP RING
Panel Mounting - Cut a 4-3/4˝ or 121 mm diameter hole in the panel and insert the unit from the front. Slip on the
mounting ring with the stepped side facing rear. Next, t the snap ring into the narrow groove at back edge of bezel.
Thread four (6) 32 x 1-1/4˝ mounting screws into tapped holes in mounting ring and set it against snap ring. Tighten
screws against rear of panel. See Figure B.
GROOVE
Ø4-3/4 [120.65] HOLE
PNEUMATIC
PRESSURE T
Figure B
Surface Mounting - Drill (3) 3/16˝ (4.76 mm) diameter holes for mounting and cut a 9/16˝ x 1-1/2˝ (14.3 x 38.1 mm)
opening for access to terminal block as indicated in Figure B. If rear pressure connections are to be used, also provide
1/2˝ diameter holes as shown in Figure A and Figure C. Insert 6-32 machine screws from rear of mounting surface,
thread into tapped holes on back of transmitter and tighten.
Figure C
For -SS Bezel Installation
Provide a 4-9/16˝ opening in panel. Insert gage and secure with supplied mounting hardware.
WIRING
The DH3 uses a standard 15 pin male high density D-Sub connector available from most electronic distributors. A
pre-wired 18˝ cable is included with each unit. See below table for cable color wiring information.
15 PIN
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
Connector
Terminal
1
6
2
11
12
13
14
15
10
5
Cable
Color
Brown
Yellow
Black
Red
Vilolet
Grey
White
Blue
Green
Orange
NOTES:
1. If 12-24 VDC power is used, the polairty is unimportant.
2. Wire in accordance with an equivalent national standard or code. Use copper conductors only rated for 60°C.
3. All terminals are rated CLASS 2.
4. ISOLATION: All inputs and outputs to each other: 500 VAC.
5. 4-20 mA Transmitter – Check the specications for the device receiving this signal for input resistance. Typical 250
to 600 OHMS, 600 OHMS maximum.
SP1
E
FRONT PANEL
SP2
ALLO
ALHI
INWC
SP2 DESCRIPTOR
SP1 DESCRIPTOR
MULTIPLIER
DESCRIPTOR
VISABLE WITH
SOME VELOCITY
AND FLOW
RANGES
X1K
1.000
MENU
SP/AL
KEY FUNCTIONS
Keys Home Position Function Main Menu Function Sub Menu Function
SP/AL
MENU
ARROW
DOWN
ARROW
ENTER
RESET
Sequences the display
SP/AL
through SET POINT and
ALARM settings
Allows access to the
MENU
menus
UP
Displays full scale
range of unit
Clears or resets an Alarm
RST
(alarm set for manual
reset)
Return to home
position
Return to home
position
Sequences through
menus
Sequences through
menus
Enter into
SUB MENU
E
RST
Return to home
position
Return to previous
menu
Increments a value
Decrements a value
Changes a value or
setting. Press
ENTER and display
will blink. Adjust with
UP or DOWN arrows.
Press ENTER to
store. Display will
stop blinking.
Peak/Valley SUB
MENU resets display
to present value.
ALARM
DESCRIPTOR
UNITS
INPUT VALUE
SETTING SET POINTS AND ALARMS
CONTROL MODE
CONTROL MODE
PRES
SP/AL
The hot key provides direct access to the Set Point and Alarm MENU. The Set Point and Alarm MENUS that are
displayed are based upon the Control (CtrL) SUB MENU.
CONTROL MODE
SP1L
SP/AL
SP/AL
SP/AL
Visible when
SP/AL
SP/AL
or
SP2L
Visible when
Visible when
for the desired relay turn off point.
mode =
mode =
mode =
SP/AL SP/AL
SP/AL SP/AL
SP/AL SP/AL
SP/AL
SP/AL
SET POINT ADJUSTMENT
Adjusting the DH3 Set Points is quick and simple. Instead of setting a set point and deadband, simply adjust
SP2H
for the desired relay turn on point, and then adjust
1.0
0.8
0.6
SURE
(in. w.c.)
0.4
SP1H
or
0.2
0
In the above graph, an instrument with a 1.0˝ range would have the SP1 relay turn on at 0.8˝ and off at 0.4˝.
the relay turn on point, and
mode, which means the relays turn on with an increase in pressure. SP1 may be congured to act as a reverse acting
relay (refer to the 1SP SUB MENU setting, page 15). When set for reverse acting,
SP1L
and
sets the relay turn ON point. SP2 is always direct acting.
SP1L
sets the relay turn off point. The relays outputs normally function in the direct acting
0
TIME
SP1H
sets the relay turn OFF point,
SP1H
sets
Menu Map
E
MENU
MAIN MENUS SUB MENUS
SETTINGS
CONTINUED
MENUS
UNAVAILABLE
FOR
BI-DIRECTIONAL
RANGES AND
RANGES ABOVE
25 IN. W.C.
SETTINGS
MAIN MENUS SUB MENUS
E
CONTINUED
MENU
MAIN MENUS SUB MENUS
E
SETTINGS
Menus present only
in pressure operation
MENU
Main Menu Selections (Upper Right Display Reads
SECr
Security - Lock out access to Set Point and Alarm settings, or lock out access to all settings.
OPEr
Operation - Selection of Pressure, Velocity or Flow and corresponding engineering units.
OUt
Output - Select a Single Set Point, 2 Set Points, or a Set Point and an Alarm mode of operation.
d.S
Display - Monitor and adjust display related settings: Peak, Valley, display resolution, % output and
dampening.
AdU
Advanced functions - Modify advanced function parameters, transmitter output scaling, Maintenance Set
Point settings and calibration.
MENU
)
MAIN MENUS and SUB MENUS
SECr
(Security) MAIN MENU
SECr
is the only SUB MENU in the security MENU. When the security SUB MENU is selected, the present security
level is displayed in the upper right hand display. To change the security level, adjust the number displayed to the
number shown in the following table for the desired security level.
Security Level
Displayed Access
1 All menus access 10
2 Menu Access
3 SP/AL Access
4 All settings locked 111
The password values shown in the table cannot be altered, so retain a copy of these pages for future reference.
OPEr
(Operation) MAIN MENU
The
OPEr
The SUB MENUS are:
PrES
- Pressure
UEL
- Velocity
FLO
- Flow
If the instrument is set for Velocity, the
set for Flow, the
Velocity and Flow. When scrolling through the
for will show the units in the upper right display. The other measurement types will have a blank upper right display.
SP/AL Locked
Menus Locked
MENU selects the measurement type of the instrument.
KFAC
ArEA
DIA
- Diameter
OPEr
MENU will have additional
Password
Value to Enter
70
90
- K Factor
- Area
XDIM
- X Dimension
YDIM
- Y Dimension
OPEr
MENU will have an additional
KFAC
OPEr
and
SUB MENUS, the measurement type the unit is currently set
KFAC
ArEA
SUB MENUS. These will be discussed under
SUB MENU. If the instrument is
Units visible, so unit
is presently set to
measure pressure
Units not visible Units not visible
PrES
(Pressure) SUB MENU
For pressure measurement, the following units are available:
NWC
- Inches of water column
FTWC
- Feet of water column
MMWC
- Millimeters of water column
CMWC
- Centimeters of water column
PSI
- Pounds per square inch
INHG
- Inches of mercury
Table 1 - Pressure Range vs. Available Units
INWC FTWC MMWC CMWC PSI INHG MMHG MBAR PA KPA HPA OZIN
.1000
.2500
.5000
1.000
2.500
5.000
10.00
25.00
50.00
100.0
Note:
OVFL
scale by 2%.
UEL
(Velocity) SUB MENU
For velocity measurement, the following units are available:
.2083
.4167
.8333
2.083
4.167
8.333
(over ow) or
2.540
6.350
12.70
25.40
63.50
127.0
254.0
635.0
1270
2540
.2540
.6350
1.270
2.540
6.350
12.70
.1806
25.40
.3613
63.50
.9032
127.0
1.806
254.0
3.613
UnFL
(under ow) will appear when the ranges have been exceeded above or below full
.1839
.3678
.7356
1.839
3.678
7.356
.1868
.4671
.9342
1.868
4.671
9.342
18.68
46.71
93.42
186.8
MMHG
- Millimeters of mercury
MBAR
- Millibar
PA
- Pascal
KPA
- Kilopascals
HPA
- Hectopascals
OZIN
- Ounce inches
.2491
24.91
.6227
62.27
1.245
124.5
2.491
249.1
6.227
622.7
12.45
1245
24.91
2491
62.27
6227
124.5
249.1
.1245
.2491
.6227
1.245
2.491
6.227
12.45
24.91
.2491
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
.1445
.2890
.5780
1.445
2.890
5.780
14.45
28.90
57.80
SFPM
- Standard feet per minute
M/S
- Meters per second
Table 2 - Available Velocity Ranges
INPUT RANGE
IN WC
0 - 0.1
0 - 0.25
0 - 0.5
0 - 1
0 - 2.5
0 - 5
0 - 10
0 - 25
Note: Air velocity and ow readings are based upon standard dry air conditions with an ambient temperature of 70°F
and a barometric pressure of 29.92 INHG.
SFPM
RANGE
0 - 1266
0 - 2002
0 - 2832
0 - 4004
0 - 6332
0 - 8954
0 - 12.66 x IK
0 - 20.02 x IK
M/S
RANGE
0 - 6.431
0 - 10.17
0 - 14.39
0 - 20.35
0 - 32.17
0 - 45.48
0 - 64.33
0 - 101.7
FLO
(Flow) SUB MENU
For ow measurements the following units are available:
SCFM
- Standard cubic feet per minute
M3H
- Cubic meters per hour
FLOr
(Flow Range) SUB MENU
LO
- 99.99 x 1K ow range
HI
- 999.9 x 1K ow range
Tables 3-6 show the ow ranges available, and the maximum duct size that can be set for each input range.
FLOr
= LO Maximum Duct Size (English)
Table 3
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SFPM
RANGE
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. DUCT
SIZE, SQ. FT.
78.9
49.9
35.3
24.9
15.7
11.1
7.8
4.9
FLOr
= HI Maximum Duct Size (English)
Table 4
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SFPM
RANGE
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. DUCT
SIZE, SQ. FT.
789.8
499.5
353.1
249.7
157.9
111. 7
78.9
49.9
FLOr = LO
Table 5
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
KFAC
KFAC
tube, the manufacturer may specify a K Factor. The adjustment range is 0.01 to 2.00. The factory setting is 1.
Maximum Duct Size (Metric)
3
M
/Hr
RANGE
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
SUB MENU
K Factor - becomes accessible if the instrument is set for Velocity or Flow. When the DH3 is used with a Pitot
MAX. DUCT
2
SIZE M
4.32
2.73
1.93
1.37
0.86
0.61
0.43
0.27
FLOr = HI
Table 6
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Maximum Duct Size (Metric)
3
M
/Hr
RANGE
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. DUCT
2
SIZE M
43.19
27.31
19.3
13.64
8.63
6.10
4.31
2.73
ArEA, DIA, XDIM
These SUB MENUS become accessible if the instrument is set for ow. When measuring ow, the area of the duct
must be specied. Tables 3 and 4 show the input range vs maximum ow and duct size. For a rectangular duct the
maximum size is specied in square feet or meters. For a circular duct the maximum size is specied as the diameter.
X, Y and circular dimensions are entered in feet with 0.01 foot resolution for
FLOr
= HI, or entered in millimeters with 1 millimeter resolution.
ArEA
- Area, select
SUB MENU will be activated. If a rectangular duct is selected, the
DIA
- Diameter, enter the diameter of a duct
XDIM
- Enter the “X” dimension of a duct
YDIM
- Enter the “Y” dimension of a duct
and
YDIM
SUB MENUS
CIR
for a circular duct or
FLOr
= LO and 0.1 foot resolution for
RECT
for a rectangular duct. If a circular duct is selected, the
XDIM
and
YDIM
SUB MENUS will be activated.
DIA
Y
OUt
(Output) MAIN MENU
The
OUt
MENU selects the output type of the instrument. The SUB MENUS are:
CtrL
- Control type
ISP
- SP1 reverse or direct acting
AL
- Alarm type
ALrE
- Alarm reset, manual or auto
AL.H
- Alarm inhibit
ALDL
- Alarm delay
X
CtrL
(Control) SUB MENU
1SP
- Single set point
2SP
- Two fully independent set points
SPAL
- Single set point and alarm
1SP
(SP1 Reverse or Direct Acting) SUB MENU
DIR
- Direct. Relay turns on with increasing pressure
REV
- Reverse. Relay turns on with decreasing pressure
100
Process
0
100
Process
Direct Acting
SPH
SPL
Time
Relay Inactive
Relay Active
Reverse Acting
SPH
0
Relay Inactive
Relay Active
SPL
Time
The following alarm function SUB MENUS are activated when
AL
(Alarm Type) SUB MENU
HI
- High alarm
LO
- Low alarm
HILO
- For a high/low guardband type alarm
ALARM ADJUSTMENT
Alarm settings are dependent upon the selected alarm mode. The DH3 differential pressure controller alarm may
be congured as a High Alarm, Low Alarm, or High/Low Alarm. Alarm settings are all absolute and may be set to
anywhere within the range of the instrument. The dead bands of the alarms are xed at 1% of full scale.
CtrL
is set to
SPAL
:
HIGH ALARM FUNCTION
MIN. PRESSURE
MIN. PRESSURE
Relay ON Relay OFF
MIN. PRESSURE
ALLO
ALLO
ALHI
Relay OFF Relay ON
LOW ALARM FUNCTION
ALHI
MAX. PRESSURE
MAX. PRESSURE
HIGH/LOW ALARM
FUNCTION
MAX. PRESSURE
Relay ON Relay OFF Relay ON
AL0S
(Alarm Output State) SUB MENU
CL0S
- Alarm relay contacts close upon alarm condition
0PEN
- Alarm relay contacts open upon alarm condition
ALrE
(Alarm Reset) SUB MENU
ONOF
- Automatic reset
HOLD
- Manual reset. An alarm is reset by the RESET key on the front panel.
AL.H
(Low Alarm Inhibit) SUB MENU
ON
- Alarm inhibit is on
OFF
- Alarm inhibit is off
If
AL.H
is selected ON, a low alarm condition is suspended upon power up until the process value passes through
the alarm set point once.
ALDL
(Alarm Delay) SUB MENU
Sets the amount of time an alarm condition must be continuously met before the alarm condition is recognized. The
alarm delay is adjustable from 0-3600 seconds.
d.S
(Display) MAIN MENU
PEAK
- Peak value
VALy
- Valley value
ZERO
- Zero
PEAK
(Peak) SUB MENU
The Peak feature stores the highest pressure reading the instrument has measured since the last reset or power up.
At power up
RESET key while in the
PEAK
is reset to the present pressure reading. To manually reset the
PEAK
rESO
- Resolution
Pd.S
- Process display
DAMP
- Dampening level
SUB MENU.
PEAK
value, press the
VALy
(Valley) SUB MENU
The valley feature stores the lowest pressure reading the instrument has measured since the last reset or power up.
At power up
key while in the
VALy
is reset to the present pressure reading. To manually reset the
VALy
SUB MENU.
VALy
value, press the RESET
rESO
(Resolution) SUB MENU
The DH3 is capable of displaying four digits of resolution. However, at very low pressures the instability of the
pressure may cause uctuations in the least signicant digit causing the least signicant digit to be of little value.
Three digit resolution (
3DIG
- Set display for 3 digit resolution
4DIG
- Set display for 4 digit resolution
Pd.S
(Process Display) SUB MENU
STD
- Display reads pressure, velocity, or ow values
PCT
- Display reads % of full scale value
3DIG
) can only be active when there is at least one digit to the right of a decimal.
When the display is reading percent,
available in pressure operation.
DAMP
(Dampening) SUB MENU
Adjust from 1-16
Dampening stabilizes the display from instabilities due to things such as vibration and excessive pressure
uctuations. The dampening setting adjusts the amount of readings that are averaged for each display update.
Adjust the dampening value until the display reads a stable value for the application.
AdU
(Advanced) MAIN MENU
POL
- Process output low
POH
- Process output high
MSP1
- Maintenance set point 1
MSP2
- Maintenance set point 2
POL
and
POH
(Process Output Low and High) SUB MENUS
This feature is used in pressure operation only.
Process output low and high are used to scale the 4-20 mA output. Set
output, and set
adjusted 2% BELOW minimum scale up to
POH
to the desired display reading for 20 mA output.
PCT
is displayed in the upper right of the display. The percent display is only
ZERO
- Zero calibration
SPAN
- Span calibration
POL
to the desired display reading for 4mA
POH
POH. POH
may be adjusted from
must be higher than
POL
to 2% ABOVE maximum scale.
POL. POL
may be
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
xed at 2% of full scale. To enter or leave the maintenance mode, press and hold the for 8 seconds.
ZERO
and
SPAN
The lower display reads
ZERO
Calibration
Note: For accurate calibration, do not apply any pressure when performing this function.
(Calibration of Zero and Span) SUB MENUS
CAL
in this mode.
SP/AL
With the display reading
the zeroing of the instrument or press the
SPAN
Calibration
With the display set to
blink. Press ENTER again to complete the calibration or press the
ZERO
, press the ENTER key. The upper display will blink. Press ENTER again to complete
SPAN
, apply full scale pressure to the unit. Press the ENTER key. The upper display will
MENU
key to cancel.
MENU
key to cancel.
©Copyright 2018 Dwyer Instruments, Inc. Printed in U.S.A. 12/18 FR# 443555-00 Rev. 6
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
dwyer-inst.com
e-mail: info@dwyermail.com
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