Dwyer DHC Manual

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SERIES DH

DIGIHELIC® DIFFERENTIAL PRESSURE CONTROLLER

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

CALIBRATION SERVICES AVAILABLE

PRESSURE

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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 4-20 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 4-20 mA process output to t your application’s

range; Modbus

BENEFITS/FEATURES

• 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

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 and DH-010.

OPTIONS To order add sufx: Description

-B

-FC

-NIST

Example: DH-004-FC

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

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

communications; and eld calibration.

w.c.

.2500

1.000

5.000

10.00

25.00

50.00

100.0

w.c.

.4167 .8333

2.083

4.167

8.333

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

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

mm Hg mbar Pa kPa hPa oz/in

0.467

0.623

.3678 .7356

1.839

3.678

7.356

1.868

9.342

18.68

46.71

93.42

186.8

2.491

12.45

24.91

62.27

124.5

249.1

62.28

249.1 1245 2491

6227

0.249

1.245

2.491

6.227

12.45

24.91

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 = 100-240 VAC, 50-400 Hz or 132-240

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

Output Signal: 4-20 mA DC into 900 Ω max. Zero and 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 Compliance: 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.

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

ACCESSORIES Model Description A-203

A-266 Digihelic Links MN-1

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RTU, RS485, 9600 baud.

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 and DH-010.

1/8˝ ID x 1/4˝ OD PVC tubing

Digihelic

™

Communications software Mini-Node are an easy solution for utilizing the Digihelic 485 serial communication and connecting to virtually any PC

Process Tubing Options: See page 453 (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.

surface mounting bracket

™

USB/RS-485 converter; the Mini-Node™ converters

Modbus

is a registered trademark of Schneider Electric USA, Inc.

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controller’s RS-

DWYER INSTRUMENTS, LLC | dwyer-inst.com

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Gages/Switches, Transmitters

Differential Pressure