Dwyer Instruments Digihelic Specifications

[12.70]

[114.30]

SERIES DH

DIGIHELIC® DIFFERENTIAL PRESSURE CONTROLLER

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

3-19/32

[91.28]

4-1/2

1-3/4

[44.45]

3-25/32

[96.04]

4-1/2

[114.30]

1-15/16

[49.21]

PRESSURE

1/2

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

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® communications supports Process and HVAC system integration and 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

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 in w.c. ft w.c. mm w.c. cm w.c. psi in Hg mm Hg mbar Pa kPa hPa oz/in 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.

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

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

communications; and eld calibration.

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

.2500

1.000

5.000

10.00

25.00

50.00

100.0

.4167

.8333

2.083

4.167

8.333

6.350

25.40

127.0

254.0

635.0 1270 2540

0.635

2.540

12.70

25.40

63.50

127.0

254.0

.1806

.3613 .9032

1.806

3.613

.3678

.7356

1.839

3.678

7.356

0.467

1.868

9.342

18.68

46.71

93.42

186.8

0.623

2.491

12.45

24.91

62.27

124.5

249.1

62.28

249.1 1245 2491 6227

SPECIFICATIONS Service: Air and non-combustible, compatible gases. Wetted Materials: Consult factory. Housing Material: 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: 4-20 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:

(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: Electrical Rating: 8 amps at 240 VAC resistive. Set Point Adjustment: Adjustable via keypad on face.

ACCESSORIES Model Description MN-1

A-266 A-203 Digihelic Links

0.623

2.491

12.45

24.91

62.27

124.5

249.1

0.144

0.578

2.890

5.780

14.45

28.90

57.80

0.249

1.245

2.491

6.227

12.45

24.91

ABS plastic, UL approved 94 V-0.

Compression tting for use with 1/8˝ ID X 1/4˝ OD tubing

RTU, RS485, 9600 baud.

2 SPDT relays.

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

converters are an easy solution for utilizing the

controller’s RS-485 serial communication

Digihelic 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 489 (Gage Tubing Accessories)

0.25 to 0 - 0.25 in w.c.

1.0 to 0 - 1.0 in w.c.

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

is a registered trademark of Schneider Automation, Inc.

DWYER INSTRUMENTS, INC. | www.dwyer-inst.com

Gages/Switches, Digital

Differential Pressure