Peter said:
> instead using a simple microswitch in the airflow path
There is nothing as simple and reliable as that.<
Provided that you can get a big enough vane for the airflow to provide the
necessary force to operate the microswitch, and the vane doesn't add so much
resistance to the airflow path that you need a bigger and noisier blower. The
pressure differential with 1 inch water gauge is roughly 3grams/sq.cm, so you
need a very sensitive microswitch. Possibly you could make something with a
big vane and a reed relay.
73
Peter G3RZP
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