• Converts airspeed into a 4 - 20mA or a
    0 - 10 VDC signal
  • Linear output signal
  • Fully electronic registration of airflow
  • AC or DC voltage supply
  • Compensates for changes of air temperature
  • Telescopic sensor facilitates installation
  • Temperature output signal 0 - 10 VDC
  • Fuse Protected
  • Made with corrosion resistant material




  • The ESF-35-2 airflow transducer can be used in a wide range of applications such as:

    - Measurements of airflow speed via
      PLC/outstation/EMS
    - Regulation of airflow speed
    - Monitoring of airflow speed


    The airflow transducer ESF-35-2 is installed in such a way that the current of air passes through the gap of the sensor head. Conductors to and from the transducer should be kept isolated from high-power conductors where powerful transient voltage spikes may appear.


    Airflow speed 0 - 16 m/s (3150 ft/min),
    (jumper selectable) 0 - 8 m/s (1575 ft/min)
    Output AC Ripple 4 - 20mA, 0 - 10 VDC
    Output signal (temperature) 0 - 10 VDC
    Temperature range 0C - 50C (32F - 122F)
    Air temperature -10C - 60C (14F - 140F)
    Ambient temperature -20C - 50C (-4F - 122F)
    AC voltage supply: 24 VAC (120mA)
    DC voltage supply 16 - 30 VDC (80mA)
    Absolute accuracy 0%
    Rise time 20 sec
    Time constant 5 sec
    Depth of insertion in channel 50 - 200 mm (2-8 in)
    Dimensions (H x W x D) 80 x 80 x 55 mm
    (3.15 x 3.15 x 2.17 in)



    The ESF-35-2 transducer registers the airflow speed according to a thermal principle based on the fact that the cooling action of air increases with airspeed. The action is measured and converted to a 4 - 20mA or a 0 - 10 V signal corresponding to airflow speeds from 0 - 8 m/s (0 - 1575 ft/min) or 0 - 16 m/s (0 - 3150 ft/min).