Product Overview

DWYER INSTRUMENTS, INC. | dwyer-inst.com36
Differential Pressure
Gages/Switches, Transmitters
PRESSURE
Process Tubing Options: See page 453 (Gage Tubing Accessories)
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 bi-directional
(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 (uni- and
corresponding bidirectional), ≤ 1 in w.c.:
9 psi; 2.5 and 5 in w.c.: 1.5 psi; 10 in
w.c.: 3 psi; 25 in w.c.: 8 psi; 50 in w.c.: 15
psi; 100 in w.c.: 20 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 in and ±0.25
in w.c. ranges: ±0.03%/°F (±0.054%/°C).
Power Requirements: 12-28 VDC, 12-
28 VAC 50 to 400 Hz.
Power Consumption: 3 VA max.
Output Signal: 4-20 mA DC into 900
Ω max.
Zero and Span Adjustments:
Accessible via menus.
Response Time: 250 ms (damping 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) OD x 3-1/8˝ (79.38
mm); -SS bezel: 4-3/4˝ (120.7 mm) OD x
2-21/32 (67.5 mm).
Weight: 1.75 lb (794 g).
Agency Approvals: CE.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 1 A @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via
keypad on face.
DIGIHELIC
®
3 DIFFERENTIAL PRESSURE CONTROLLERS
Digihelic
®
Controller in Photohelic
®
Gage, Square Root Output for Flow
[4] 6-32 HOLES EQUALLY
SPACED ON A 5-1/8 [130.18]
B.C. PANEL MOUNTING
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
1/8 FEMALE NPT
HIGH PRESSURE
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
HIGH PRESSURE
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 LOW
PRESSURE
CONNECTION
[3] Ø3/16 [4.77] HOLES
EQUALLY SP
ACED ON
A 4-1/8 [104.78] B.C.
SURFACE MOUNTING
The Series DH3 Digihelic
®
3 Differential Pressure Controllers are 3-in-1 instruments
possessing a digital display gage, control relay switches, and a transmitter with current
output all packed in the popular Photohelic
®
gage style housing. Combining these 3
features allows the reduction of several instruments with one product, saving inventory,
installation time and money. The Digihelic
®
controller is the ideal instrument for
pressure, velocity and ow applications, achieving a 1.5% or better full-scale accuracy
on ranges down to the extremely low 0.25 in w.c. to 2.5 in w.c. full-scale. Ranges of 5 in
w.c. and greater maintain 0.5% FS accuracy. Bi-directional ranges are also available.
The Series DH3 Digihelic
®
controller allows the selection of pressure, velocity or
volumetric ow operation in several commonly used engineering units. 2 SPDT control
relays with adjustable deadbands are provided along with a scalable 4-20 mA process
output.
Programming is easy using the menu key to access 5 simplied menus which provide
access to: security level; selection of pressure, velocity or ow operation; selection of
engineering units; K-factor for use with ow sensors; rectangular or circular duct for
inputting area in ow applications; set point control or set point and alarm operation;
alarm operation as a high, low or high/low alarm; automatic or manual alarm reset;
alarm delay; view peak and valley process reading; digital damping for smoothing
erratic process applications; scaling the 4-20 mA process output to t your applications
range and eld calibration.
FEATURES/BENEFITS
• 3-in-1 instrument allows the reduction of several instruments with one product,
saving inventory, installation time and money
• Full-scale accuracy of 1.5% or better even on extremely low ranges, and 0.5% for
ranges above 5 in w.c. provide for greater measurement precision
• Secure menu program provides access to device operation only for the right skill
level
• Optional stainless steel bezel is the same installation diameter as Magnehelic
®
gage
and simplies eld upgrade to DH3 pressure controller
APPLICATIONS
• SCFM duct ow
• Filter status
• Duct or building static pressure
• Damper and fan control
SERIES DH3
V
I
D
E
O
O
N
L
I
N
E
Note: Shown with optional -SS bezel.
Backward compatible
+
with Magnehelic
®
gage.
OPTIONS
To order add sufx: Description
-SS 304 brushed stainless steel bezel.
+
Backward compatible
with standard Magnehelic
®
gage installation diameter
Example: DH3-004-SS
-NIST NIST traceable calibration certicate
Example: DH3-004-NIST
-FC Factory calibration certicate
Example: DH3-004-FC
MODEL CHART
Model Ranges Model Ranges
DH3-002
DH3-003
DH3-004
DH3-005
DH3-006
DH3-007
DH3-009
0 to 0.25 in w.c.
0 to 0.5 in w.c.
0 to 1 in w.c.
0 to 2.5 in w.c.
0 to 5 in w.c.
0 to 10 in w.c.
0 to 25 in w.c.
*DH3-010
*DH3-011
*DH3-013
*DH3-014
*DH3-015
*DH3-016
*DH3-017
*DH3-018
0 to 50 in w.c.
0 to 100 in w.c.
0 to ±0.25 in w.c.
0 to ±0.5 in w.c.
0 to ±1 in w.c.
0 to ±2.5 in w.c.
0 to ±5 in w.c.
0 to ±10 in w.c.
*Velocity and volumetric ow not available on bi-directional
range units and models DH3-010 and DH3-011.
ACCESSORIES
Model Description
A-298
A-301
A-302
A-302F-A
A-370
A-489
Flat aluminum bracket for ush mounting
Static pressure tip for 1/4˝ metal tubing connection
Static pressure tip for 3/16˝ and 1/8˝ I.D. plastic or rubber tubing
303 SS static pressure tip with mounting ange; for 3/16˝ I.D. rubber or
plastic tubing; 4˝ insertion depth; includes mounting screws
Mounting bracket ush mount bracket; bracket is then surface
mounted; steel with gray hammertone epoxy nish
4˝ straight static pressure tip with ange
Pressure_2021.indb 36 7/15/20 8:16 AM