Electronic Differential Pressure Switch & Transmitter – HK Instruments DPI Series


  • Configurable Switching Point: Open on rise or fall in pressure
  • Hysteresis of setpoint
  • Measurement units (Pa, kPa, mm WC, inWC, mbar)
  • Measurement range (4 ranges per model)
  • Output signal (0−10 V, NO/NC)
  • Span and zero point calibration

Electronic differential pressure switch and transmitter

The DPI series electronic pressure measuring devices are engineered for building automation in HVAC/R industry. The most technologically advanced and versatile electronic differential pressure switches on the market, combining up to two relay outputs and 0–10 V output options.


DPI series devices are commonly used in HVAC/R systems for:

  • Fan, blower and filter monitoring
  • Staircase pressure monitoring and alarm
  • Pressure monitoring in cleanrooms
  • Boiler pressure monitoring and alarm


Accuracy (from FS): ±1.5 % (±0.7 % with span point calibration) (including: general accuracy, temperature drift, linearity, hysteresis, and repetition error)
Long term stability, typical 1 year: ±1 Pa (±8 Pa without autozero element -AZ)
Zero point calibration: automatic with autozero element (-AZ) or by pushbutton
Supply voltage: 21–35 VDC / 24 VAC ±10 % (without -AZ option)
24 VDC ±10 % / 24 VAC ±10 % (with -AZ option)
Current consumption: 35 mA + relays (7 mA each) + AZ (20 mA) + 0…10 V output (10 mA)
Output signals: 0…10 V
Relay output 1 (250 VAC / 30 VDC / 6 A)
Optional relay output 2 (250 VAC / 30 VDC / 6 A)
Operating temperature: -10…+50 °C (with autozero calibration -5…+50 °C)
Response time: 0.5…10 s
Protection standard: IP54


HK Instruments DPI Series Electronic Differential Pressure Switch & Transmitter-DpstarGroup


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