AF1 - Flow Measurement Transmitter

Air velocity measurement made easy.

The AF1 series is a cost-effective, high-precision and stable transmitter for measuring air velocity and temperature. The devices have a calorimetric sensor and outstanding long-term stability. The measuring range and the output signals can be configured easily with a Software or using the integrated DIP- switches.


  • High degree of stability and repeatability
  • Compact design
  • The outputs and measuring ranges can be configured using DIP switches
  • Simple mechanical installation
  • Outstanding price/performance ratio
  • Ideal for HVAC applications
  • Modbus RTU via RS485
Device type Transmitter / air flow rate
Parameters - Air velocity
- Temperature
Range of application 0...50 °C (housing)
0...80 °C (medium)
Accuracy ±3.0 % full-scale
with 23 °C ±3 K, 45 %RH, 1013 mbar
Influence of installation position <3 % of measurement with <10°
Measurement principle Calorimetric
Measurement ranges 2 m/s; 5 m/s; 10 m/s; 15 m/s; 20 m/s
Pressure resistance 10 bar
Jump response τ90 after 3 s
Medium Air and non-aggressive gases
Power consumption 8…35 VDC or 12…30 VAC 50/60 Hz
<200 mA
Electrical connections Screw terminals
Cable gland M12 x 1.5 (Ø cable 3…6.5 mm)
Measurement interval 1 s
Circuit type 3-wire
Analog outputs 1
Analog output signal (standard) 4…20 mA or 0…10 V
Permissible load >10 kΩ (voltage output)
<500 Ω (current output)
Communication interfaces RS-485
Housing Polycarbonate
IP protection rating IP65
Mounting Sensor at 90° angle to flow
Configuration Via integrated DIP switch
CE / EMC conform EMC Directive 2004/108/EC
Storage and transport conditions -20...60 °C
Dimensions 105 x 70 x 32 mm

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