Hi James,

I've used float switches that are a mercury switch in a buoyant enclosure o=
n a very flexible cable. I've used them in water tanks to disconnect well p=
umps when the tank gets full. That might be harder to foul than a tradition=
al float switch, as long as the tank is tall enough.

Friendly regards, Bob


> Sometimes the drain becomes blocked.

> Liquid levels increase slowly, blocking the airflow, until the gas
generation of the bin contents exceeds the airflow, then the residents
really notice.  Pong.

> How to measure the liquid level?

> Float switches would become fouled.

--=20
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