Flow Transmitter – HK Instruments DPT-Flow Series


  • Two field selectable functions:
    • Measure and monitor in-duct volume flow, velocity or differential pressure
    • Measure and monitor air flow across centrifugal fans
  • Multiple field selectable measurement units:
    • Volume flow: m3/s, m3/h, cfm, l/s
    • Velocity: m/s, ft/min
    • Pressure: Pa, inWC, mmWC, kPa, mbar, psi
  • Unique proportional output options:
    • Volume flow or velocity: voltage (0–10 V) or current (4–20 mA)
    • Pressure: voltage (0–10 V) or current (4–20 mA)

DPT-Flow is a flow transmitter that provides a new and easy way to measure the flow rate on centrifugal fans.

One device is suitable for a range of different fan types. It also provides an easy way to measure flow rate in a duct system. The device is supplied with an optional FloXactTM averaging measurement probe.


The DPT-Flow is designed for air handling units to measure the air flow on centrifugal fans. The DPT-Flow can be used as an on-site display for flow or as a transmitter to regulate the air flow on a selected fan or blower.

The DPT-Flow can also be used in the duct system or in air handling units as an on-site display for flow or as a transmitter to regulate the air flow in a duct. The device can be used with several different measurement probes such as FloXactTM or pitot tube, and air dampers. The requirement is that the K-value of the measurement probe or damper is known.


DPT-Flow series devices are commonly used in HVAC/R systems for:

  • Air flow monitoring across centrifugal fans and blowers
  • In-duct air flow monitoring
  • VAV applications


Accuracy (from applied pressure): Pressure < 125 Pa = 1 % + ±2 Pa
(models 1000 and 2000) Pressure > 125 Pa = 1 % + ±1 Pa
Accuracy (from applied pressure): Pressure < 125 Pa = 1.5 % + ±2 Pa
(models 5000 and 7000) Pressure > 125 Pa = 1.5 % + ±1 Pa
Zero point calibration: automatic with autozero element (-AZ) or by pushbutton
Measuring units: Pressure: Pa, kPa, mbar, inchWC, mmWC, psi
Flow: m3/s, m3/hr, cfm, l/s, m/s, ft/min
Supply voltage: 24 VAC ±10 % / 24 VDC ±10 %
Power consumption: < 1,0 W
Output signals for pressure and air flow (selectable by jumper): 0…10 VDC
4…20 mA
Operating temperature: -20…+50 °C (with autozero calibration -5…+50 °C)
-40…+50 °C (-40C model)
Response time: 1…20 s
Protection standard: IP54


HK Instruments DPT-Flow Series Flow Transmitter-DpstarGroup


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