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% 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.
| Model | | Description | |
|---|
| DH3-002 | |
Differential Pressure Controller, range 0-0.25" w.c. | |
| DH3-003 | |
Differential Pressure Controller, range 0-0.5" w.c. | |
| DH3-004 | |
Differential Pressure Controller, range 0-1" w.c. | |
| DH3-005 | |
Differential Pressure Controller, range 0-2.5" w.c. | |
| DH3-006 | |
Differential Pressure Controller, range 0-5" w.c. | |
| DH3-007 | |
Differential Pressure Controller, range 0-10" w.c. | |
| DH3-009 | |
Differential Pressure Controller, range 0-25" w.c. | |
| DH3-010 | |
Differential Pressure Controller, range 0-50" w.c. | |
| DH3-011 | |
Differential Pressure Controller, range 0-100" w.c. | |
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 ? 2.5 in w.c.: 25 psi; ±2.5", 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 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). For 0.25" and ±0.25" w.c. ranges: ±0.03%/°F (±0.054%/°C).
- Power Requirements:
- 12-28 VDC, 12-28 VAC 50 to 400 Hz.
- Power Consumption:
- 3 VA max.
- Output Signal:
- 4-20 mA DC into 900 ohms 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. 4' and 10' cables available.
- 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 amp @ 30 VAC/VDC.
- Set Point Adjustment:
- Adjustable via keypad on face.