Air Flow Switch

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 ms (0 - 1575 ftmin) or 0 - 16 ms (0 - 3150 ftmin).