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.


Watch a video about how to configure DPT-Flow:



Technical details

Accuracy (from applied pressure):
(models 1000 and 2000)
Pressure < 125 Pa = 1 % + ±2 Pa
Pressure > 125 Pa = 1 % + ±1 Pa
Accuracy (from applied pressure):
(models 5000 and 7000)
Pressure < 125 Pa = 1.5 % + ±2 Pa
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 / 2...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




Product series

Flow transmitter for HVAC systems

Measuring ranges

0...1000 Pa
0...2000 Pa
0...5000 Pa
0...7000 Pa

Zero point calibration

With autozero calibration
Standard with pushbutton manual zero point calibration


With display

Cold resistance

-40 ºC cold resistant (not available with autozero calibration)
Without -40 ºC cold resistance

Other Air flow and velocity transmitters: