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Digihelic® Differential Pressure Controller

Series DH

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. 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 0.5% full scale accuracy on ranges from 0.25 to 100 in. w.c. The Digihelic® controller allows the selection of pressure, velocity or volumetric flow 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. In velocity of flow modes, a square root output is provided on the 4-20 mA signal to coincide with the actual flow curve. The Series DH provides extreme flexibility 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 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 readings; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your application's range;Modbus® communications; and field calibration.

  • Service: Air and non-combustible, non-conducting 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" 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 ohms 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: Compression fitting for use with 3/16" OD x 1/8" 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" (45 x 92 mm)
  • Weight: 14.4 oz (408 g). Serial Communications: Modbus® RTU, RS485, 9600 Baud
  • Agency Approvals: CE, UL


  • Pressure Measurement
  • Pressure



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