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Greystone Energy – Air Flow/Temperature Tx.

Air Flow Transducer

ESF is an airflow transducer with a broad application area. It can be used
for control, surveillance, and regulation of the flow rate in fresh-air
and ventilation systems, etc.


  •     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.

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).

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