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, Load R minimum 1 kΩ or 4…20 mA, maximum load 500 Ω
Operating temperature: -10…+50 °C (with autozero calibration -5...+50 °C)
Response time: 1...20s
Protection standard: IP54
inWC models: ETL marking, standard IEC61010-1




Product series

Flow transmitter for HVAC systems

Model type

Analog outputs

Measuring ranges

0...1000 Pa
0...2000 Pa
0...5000 Pa
0...7000 Pa
0...4 inWC
0...8 inWC
0...20 inWC
0...30 inWC

Zero point calibration

With autozero calibration
Standard with pushbutton manual zero point calibration


With display

Other Air flow and velocity transmitters: