Pressure Switch

December 25, 2009

Pressure Switch
Is there such thing as a pressure switch that disconnects the circut when pressure is applied?

I need a the smallest DC pressure switch that I can find that will DISCONNECT the circut when pressure is applied. I also need it to be very sensitive. any information would help. Thanks

How much pressure (low) are you talking about, and is it air pressure? or water pressure?

For very low air pressure, a condenser microphone element is about as sensitive as you can get. It will produce voltage in the micro-bar regime. All you have to do is amplify it and put a comparator on the output of the amplifier to trigger your disconnect circuit.

Other than that, here are some commercial products:

http://www.omega.com/toc_asp/sectionSC.asp?section=H&book=pressure

.

how a pressure switch works
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