Compressor not stopping at 120psi

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Compressor not stopping at 120psi

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23-02-2010, 20:01

Ether

systems engineer (retired)

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Join Date: Nov 2009

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Re: Compressor not stopping at 120psi

Quote:

Originally Posted by Gary Dillard

First - check across the terminals of the pressure switch with an ohmeter while you are pressurizing the system. I think it is a normally closed switch so you should read some resistance value until you reach about 120, then it should go to off-scale because the switch has opened.

Will the pull-up resistor in the DIO confuse the ohmmeter reading ?

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