Series DH3 Digihelic® Differential Pressure Controller

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.

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Features

  • Compact, rugged construction
  • High overpressure
  • Readable display
  • Sensitive operation keys
  • Diagnostic function
  • with an analogue signal available
  • by up to 2 programmable switching outputs

Applications

  • SCFM flow in ducts
  • Filter status
  • Static pressures in ducts or buildings
  • Damper control
  • Fan control

Specification

Parameter Value
Service Air and non-combustible, compatible gases
Wetted Materials Consult factory
Housing Material Die cast aluminum case and bezel
Accuracy
Refer to specific range below: <br> * ±1.5% for 0.25″ and ±0.25″ w.c. ranges <br> * ±1% for ranges 0.5″ to 5″ w.c. and corresponding bi-directional (except ±2.5″ w.c.) <br> * ±0.5% @ 77°F (25°C) for all other ranges including hysteresis and repeatability (after 1 hour warm-up)
Stability < ±1% per year
Pressure Limits Refer to specific range below: <br> * Ranges ≤ 2.5 in w.c.: 25 psi <br> * ±2.5″, 5 in w.c.: 5 psi <br> * 10 in w.c.: 5 psi <br> * 25 in w.c.: 5 psi <br> * 50 in w.c.: 5 psi <br> * 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 Refer to specific range below: <br> * 0.020%/°F (0.036/°C) from 77°F (25°C) for most ranges <br> * ±0.03%/°F (±0.054%/°C) for 0.25″ and ±0.25″ w.c. ranges
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 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

 

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