The AVT is an electronic air velocity and temperature transmitter for air and non-combustible gases with optional relay output.

AVT air velocity transmitters are engineered for building automaton in the HVAC/R industry. They are electronic air velocity and temperature transmitters for air. They measure air velocity and temperature in ventilation ducts, with field selectable options for measurement range and output settings in a single device.

AVT has a duct mount probe and an adjustable duct flange suitable for round or rectangular ducts.


AVT series devices include:

  • Separate readings and outputs for air velocity and temperature
  • Proportional output options: voltage (0…10 V) and current (4…20 mA)
  • PID controller for air velocity (-D models)
  • Three field selectable measurement ranges for air velocity, selectable with jumpers (models without display)
  • Freely selectable measurement range for air velocity via menu (-D models)
  • Field selectable measurement units (-D models):
    • air velocity: m/s, ft/min
    • temperature: Celsius, Fahrenheit


AVT series device options offer:

  • Display (-D models)
  • Field adjustable relay (-R models)
  • Modbus (-MOD models)


Documentation for products manufactured on week 45/2023 or earlier (QC2345, Quality Check Year/Month) here.

Technical details

Air velocity measurement: Measurement range:
0…2 m/s, 0…10 m/s, 0…20 m/s, freely selectable
Accuracy (typ at 25 °C):
v ≥ 0.15 m/s and ≤ 2 m/s (0.2 m/s + 2 % from reading)
v > 2 m/s and ≤ 10 m/s (0.5 m/s + 3 % from reading)
v > 10 m/s (1.0 m/s + 3 % from reading)
Temperature measurement: Measurement range:
-25...50 °C (probe)
Accuracy (25 °C):
±0.5 °C (air velocity > 0.5 m/s)
Measuring units: Air velocity: m/s or ft/min
Temperature: °C or °F
Supply voltage: 24 VDC ±10 % / 24 VAC ±10 %
Current consumption: max. 80 mA + 40 mA with mA output + 10 mA with relay option (DC supply voltage)
Output signal 1 (T out [C]) : 0...10 Vdc, load > 1 kΩ
4...20 mA, load 20…400 Ω
Output signal 2 (v out [m/s]) : 0...10 Vdc, load > 1 kΩ
4...20 mA, load 20…400 Ω
Optional relay output: 250 Vac, 6 A res., adjustable operating direction, switching point and hysteresis
Operating temperature: -25...50 °C (probe)
0...50 °C (transmitter housing)
Probe: Stainless steel, adjustable immersion length, mounting flange included
Protection standard: IP54, cable downwards




Product series

Air velocity transmitter


with Modbus (not available for -R models)
without Modbus


with display
without display (not available for -MOD and -R models)


with relay (not available for -MOD models)
without relay

Probe length

200 mm
100 mm
400 mm

Other Air flow and velocity transmitters: