Dwyer Instruments SERIES DH3 Catalog Page

[4] 6-32 HOLES EQUALLY

2-1/16

[44.45]

SERIES DH3

E

DIGIHELIC® 3 DIFFERENTIAL PRESSURE CONTROLLERS

Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow

PRESSURE

1/8 FEMALE NPT

HIGH PRESSURE

CONNECTION

1-1/4

[31.75]

1/8 FEMALE NPT

LOW PRESSURE

CONNECTION

E

O

D

I

V

O

N

L

I

N

Note: Shown with optional -SS bezel.

Backward compatible

+

with Magnehelic® gage.

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
features allows the reduction of several instruments with one product, saving inventory,
installation time and money. The Digihelic

pressure, velocity and ow applications, achieving a 1.5% or better full-scale accuracy

®

gage style housing. Combining these 3

®

controller is the ideal instrument for

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

volumetric ow operation in several commonly used engineering units. 2 SPDT control

®

controller allows the selection of pressure, velocity or

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

Differential Pressure

• 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

Gages/Switches, Transmitters

• 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

MODEL CHART
Model Ranges Model Ranges
DH3-002

DH3-003
DH3-004
DH3-005
DH3-006
DH3-007
DH3-009

*Velocity and volumetric ow not available on bi-directional

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.

range units and models DH3-010 and DH3-011.

[52.39]

[50.80]

2-1/2

[63.50]

2

SPACED ON A 5-1/8 [130.18]

B.C. PANEL MOUNTING

[12.70]

Ø5

[127.00]

ø4-47/64

[120.25]

5/8 [15.88]

PANEL MAX

3/16

[4.76]

Ø4 [101.60]

FACE

5-1/2 [139.70] O.D.

MOUNTING RING

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, 12­28 VAC 50 to 400 Hz.

Power Consumption: 3 VA max.

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

OPTIONS
To order add sufx: Description

-SS 304 brushed stainless steel bezel.

with standard Magnehelic

Example: DH3-004-SS

-NIST NIST traceable calibration certicate

Example: DH3-004-NIST

-FC Factory calibration certicate

Example: DH3-004-FC

11/16

1/2

[17.46]

1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION

30°

1-9/32
[32.54]

1/8 FEMALE

NPT LOW

PRESSURE

CONNECTION

11/16

[17.46]

1/2

[12.70]

[3] Ø3/16 [4.77] HOLES
EQUALLY SPACED ON A
4-1/8 [104.78] B.C.
SURFACE MOUNTING

Output Signal: 4-20 mA DC into 900

Ω max.

Zero & 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:
Electrical Rating: 1 A @ 30 VAC/VDC.

2 SPDT relays.

Set Point Adjustment: Adjustable via
keypad on face.

+

®

Backward compatible

gage installation diameter

1-3/4

DWYER INSTRUMENTS, INC. | 36

Process Tubing Options: See page 455 (Gage Tubing Accessories)