Dwyer Instruments SERIES DH Catalog Page

®

SERIES DH

DIGIHELIC® DIFFERENTIAL PRESSURE CONTROLLER

3-in-1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow

3-19/32

4-1/2

[114.30]

The Series DH Digihelic® Differential Pressure Controller is a 3-in-1 instrument
possessing a digital display gage, control relay switches, and a transmitter with current
output. The Digihelic
applications, achieving a 0.5% full-scale accuracy on ranges from 0.25 to 100 in w.c.
The Digihelic
operation in several commonly used engineering units. Two SPDT control relays with
adjustable dead bands are provided along with a scalable 4 to 20 mA process output.

The Series DH provides extreme exibility in power usage by allowing 120/220 VAC
and also 24 VDC power which is often used in control panels.
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 readings; digital damping for smoothing

erratic process applications; scaling the 4 to 20 mA process output to t your

application’s range; Modbus

FEATURES/BENEFITS

• 3-in-1 instrument allows the reduction of several instruments with one product,
saving inventory, installation time and money

• Velocity of ow modes, a square root output coincides with the actual ow curve for

greater precision

• Power usage of 120/220 VAC or 24 VDC provides exibility to incorporate device in

control panel

• Secure menu program provides access to device operation only for the right skill
level

• Modbus
control

APPLICATIONS

• SCFM duct ow

• Industrial ovens air ow

• Filter status

• Clean room pressurization

• Fume hood air ow

• Surgical and medical room pressurization

• Damper and fan control

®

communications supports Process and HVAC system integration and

®

controller is the ideal instrument for pressure, velocity and ow

®

controller allows the selection of pressure, velocity or volumetric ow

®

communications; and eld calibration.

SPECIFICATIONS
Service: Air and non-combustible, compatible gases.

Wetted Materials: Consult factory.
Housing Material: ABS plastic, UL approved 94 V-0.
Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in w.c. = 2 psi; 5˝: 5 psi; 10˝: 5 psi; 25˝: 5 psi; 50˝: 5

psi, 100˝: 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).
Power Requirements: High voltage power = 100 to 240 VAC, 50 to 400 Hz or 132

to 240 VDC. Low voltage power = 24 VDC ±20%.
Power Consumption: Low voltage power = 24 VDC - 130 mA max; High voltage
power = 100 to 240 VAC, 132 to 240 VDC - 7VA max.

Output Signal: 4 to 20 mA DC into 900 Ω max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms.
Display: 4 digit LCD 0.4˝ height. LED indicators for set point and alarm status.
Electrical Connections: Screw terminals.
Process Connections: Compression tting for use with 1/8˝ ID X 1/4˝ OD tubing

(3.175 mm ID x 6.35 mm OD). Optional barbed tting for 3/16˝ ID tubing.

Enclosure Rating: Face designed to meet NEMA 4X (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Size: 1/8 DIN.
Panel Cutout: 1.772 x 3.620 in (45 x 92 mm).
Weight: 14.4 oz (408 g).
Serial Communications: Modbus
Agency Approvals: CE, UL.

SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 8 amps at 240 VAC resistive.
Set Point Adjustment: Adjustable via keypad on face.

[91.28]

3-25/32

[96.04]

1-3/4

[44.45]

[114.30]

®

RTU, RS485, 9600 baud.

4-1/2

1-15/16

[49.21]

1/2

[12.70]

PRESSURE

Gages/Switches, Transmitters

Differential Pressure

OPTIONS
To order add sufx: Description

-B

-NIST

Example: DH-004-NIST

-FC Factory calibration certicate

Example: DH-004-FC

MODEL CHART - AVAILABLE PRESSURE ENGINEERING UNITS

Model
DH-002

DH-004
DH-006
DH-007
DH-008
DH-009*
DH-010*

*Velocity and volumetric ow not available on bi-directional range units and models DH-009 & DH-010.

in
w.c.

.2500

1.000

5.000

10.00

25.00

50.00

100.0

Barbed tting for 3/16˝ ID tubing
NIST traceable calibration certicate

ft

mm

w.c.

-

-

.4167
.8333

2.083

4.167

8.333

cm

w.c.

w.c. psi in Hg

6.350

0.635

25.40

2.540

127.0

12.70

254.0

25.40

635.0

63.50

1270

127.0

2540

254.0

-

-

.1806
.3613

.9032

1.806

3.613

-

-

.3678
.7356

1.839

3.678

7.356

mm
Hg mbar Pa kPa hPa oz/in

0.467

0.623

62.28

1.868

9.342

18.68

46.71

93.42

186.8

2.491

12.45

24.91

62.27

124.5

249.1

249.1
1245
2491

6227

-

-

-

0.249

1.245

2.491

6.227

12.45

24.91

ACCESSORIES
Model Description
MN-1

A-266
A-203
Digihelic Links

2

0.623

0.144

2.491

0.578

12.45

2.890

24.91

5.780

62.27

14.45

124.5

28.90

249.1

57.80

Mini-Node™ USB/RS-485 converter; the Mini-Node™ converters
are an easy solution for utilizing the Digihelic
485 serial communication and connecting to virtually any PC.

®

surface mounting bracket

Digihelic

1/8˝ ID x 1/4˝ OD PVC tubing

™

Communications Software

MODEL CHART - BI-DIRECTIONAL* RANGES
Model Range
DH-012

DH-014
DH-015
DH-016
DH-017

*Velocity and volumetric ow not available on

bi-directional range units and models DH-009 & DH-010.

Modbus

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

0.25 to 0 to 0.25 in w.c.

1.0 to 0 to 1.0 in w.c.

2.5 to 0 to 2.5 in w.c.
5 to 0 to 5 in w.c.
10 to 0 to 10 in w.c.

®

is a registered trademark of Schneider Automation, Inc.

®

controller’s RS-

DWYER INSTRUMENTS, INC. |

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