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Series DH3 Digihelic® Differential Pressure Controller

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P/N#: DH3-xxx, DH3

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3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Output for Flow . The Series DH3 Digihelic® Differential Pressure Controller is a 3-in-1 instrument 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 flow applications, achieving a 1.5% full scale accuracy on ranges down to the extremely low 0.25" w.c. to 2.5" w.c. full scale. Ranges of 5" w.c. and greater maintain 0.5% F.S. accuracy. Bi-directional ranges are also available

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The Series DH3 Digihelic® Differential Pressure Controller is a 3-in-1 instrument 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 flow applications, achieving a 1.5% full scale accuracy on ranges down to the extremely low 0.25" w.c. to 2.5" w.c. full scale. Ranges of 5" w.c. and greater maintain 0.5% F.S. accuracy. Bi-directional ranges are also available.

The Series DH3 Digihelic® controller allows the selection of pressure, velocity or volumetric flow 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 simplified menus which provide access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow 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 fit your applications range and field calibration.

Please see Series AT2DH3 for ATEX approved.

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" and ±0.25" w.c. ranges. Ranges 0.5" to 5" w.c. and corresponding bi-directional (except ±2.5" 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" and ±0.25" w.c. ranges: ±0.03%/°F (±0.054%/°C).
Power Requirements:
12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
Power Consumption:
3 VA max.
Output Signal:
4 to 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).
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.

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