SERIES DH Digihelic®

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Dwyer Series DH Digihelic® | 3-in-1 Differential Pressure Controller & Transmitter

DWYER DH Digihelic® | 3-in-1 DIFFERENTIAL PRESSURE CONTROLLER &  TRANSMITTER

The Dwyer Series DH Digihelic® is a versatile 3-in-1 instrument that combines a digital differential pressure gauge, two SPDT control relays, and a scalable 4-20 mA transmitter into a single 1/8 DIN package. 

DWYER DH Digihelic® | 3-in-1 DIFFERENTIAL PRESSURE CONTROLLER &  TRANSMITTER

The Series DH Digihelic® Differential Pressure Controller provides a complete solution for monitoring and controlling pressure, velocity, and volumetric flow. It features a large 4-digit LCD display with LED indicators for setpoint and alarm status, housed in a NEMA 4X (IP66) rated front face. The device offers extreme flexibility with its universal power requirements (120/220 VAC or 24 VDC) and built-in Modbus® RTU communications for seamless system integration. Programming is simplified through a 5-menu keypad interface, allowing users to configure security levels, engineering units, K-factors for flow sensors, and alarm delays.

PRODUCT USES:

  • SCFM Duct Flow: Monitoring and controlling air flow in ventilation ducts.
  • Filter Status: Detecting pressure drops to determine when filters need replacement.
  • Clean Room Pressurization: Maintaining precise positive or negative pressure in sensitive environments.
  • Industrial Ovens: Managing airflow for consistent temperature and combustion control.
  • Medical/Surgical Rooms: Ensuring proper room pressurization for safety and sterility.
  • Damper and Fan Control: Automated adjustment based on real-time pressure or flow readings.

Technical Sheets

Instruction Manual

Catalog Page

Specifications

DWYER DH Digihelic® | 3-in-1 DIFFERENTIAL PRESSURE CONTROLLER &  TRANSMITTER – KEY SPECIFICATIONS

  • Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
  • Display: 4-digit LCD, 0.4″ height with LED setpoint/alarm indicators.
  • Output Signal: Scalable 4-20 mA DC into 900 Ω maximum.
  • Switch Type: Two (2) SPDT relays rated at 8 A @ 240 VAC resistive.
  • Power Requirements: 100-240 VAC (50-400 Hz) or 132-240 VDC; also 24 VDC ±20%.
  • Communication: Modbus® RTU, RS485 at 9600 baud.
  • Enclosure Rating: NEMA 4X (IP66) face.
  • Media Compatibility: Clean, dry air and non-combustible, compatible gases.
  • Temperature Limits: 32 to 140°F (0 to 60°C).
  • Response Time: 250 ms

 

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