the switch is closed (1) when it is below pressure and open (0) when it is full. See the pneumatics manual
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we have switches provided by the Nason company. These switches are normally closed. The switches open at approximately 115 psi and will close again at approximately 95 psi
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thus, compressor = high_pressure is correct. do not use the ~.
Like gwross said, the variable name high_pressure is a misnomer. It is a 1 when low pressure, and so should probably be called low_pressure