SERIES DHII Digihelic® II

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Dwyer Series DHII Digihelic® II | NEMA 4 Differential Pressure Controller

DWYER SERIES DHII Digihelic® II | NEMA 4 DIFFERENTIAL PRESSURE CONTROLLER

The Series DHII Digihelic® II is a versatile 3-in-1 instrument that functions as a digital pressure gage, two SPDT control relays, and a 4-20 mA transmitter in a rugged NEMA 4 (IP66) enclosure.

  • NEMA 4 housing enables a range of uses both outdoors or indoors where water is present
  • Large backlight LCD display provides local reading from a distance
  • Detachable terminal blocks reduce wiring difficulties saving installation time

DWYER SERIES DHII Digihelic® II | NEMA 4 DIFFERENTIAL PRESSURE CONTROLLER

The Series DHII packages all the advanced features of the standard Digihelic® controller into a robust aluminum and glass housing designed for harsh environments. It integrates dual SPDT control relays, a scalable 4-20 mA process output, and Modbus® RTU communications. The unit features a large, bright 4-digit backlit LCD display for high visibility at a distance and enhanced electrical wiring via detachable Euro-type terminal blocks to simplify field installation. It is ideal for monitoring pressure, velocity, or volumetric flow with high precision.

PRODUCT USES:

  • Outdoor HVAC Units: Perfect for mounting on rooftop air handlers due to its NEMA 4 rating.
  • Clean Rooms: Suitable for surface mounting in facilities requiring frequent wash-downs with water or cleaning solutions.
  • Dust Collection Systems: Monitoring filter status and controlling cleaning cycles.
  • Industrial Process Control: Precise monitoring of air and compatible non-combustible gases in industrial plants.

Technical Sheets

Instruction Manual

Catalog Page

Specifications

DWYER SERIES DHII Digihelic® II | NEMA 4 DIFFERENTIAL PRESSURE CONTROLLER – KEY SPECIFICATIONS

  • Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
  • Outputs: 4-20 mA DC (900 Ω max) and two (2) SPDT relays (8 A @ 240 VAC resistive).
  • Communications: Modbus® RTU via RS485 (9600 Baud).
  • Enclosure Rating: NEMA 4X (IP66); Aluminum and glass construction.
  • Power Supply: Universal 100-240 VAC / 132-240 VDC or low voltage 24 VDC.
  • Display: 4-digit backlit LCD (0.6″ height) with LED status indicators.
  • Process Connections: 1/8″ female NPT.
  • Operating Temp: 32 to 140°F (0 to 60°C).

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