Not necessarily true… a 145 PSI switch is, more than likely a 137.75 to 152.25 PSI switch. The industry standard for pressure sensing devices (non-instrument) is 5% of swing in either direction. Pressure switches should be weatherproof, depending on your electrical connections. The weakest link are the connections you make (plumbing / electrical).
10,000 is the industry standard minimum. I believe ours are well beyond that figure. We post our conditions in every catalog we give away. The testing procedures follow the same testing parameters as our compressors.
All VIAIR compressors are tested at 100 PSI, and 70 degrees Fahrenheit ambient temperature.
Do you just wait for the compressor to stop, check pressure, then rotate in increments until the compressor comes on and stops again or do you have to release the pressure complete before you adjust/refill?
It has a collar around the outside that is held in place by a set screw. Turning the collar clockwise increases the shut off pressure & counterclockwise decreases it. It doesn’t have a solenoid because that’s already built into our compressor.
If you adjust it higher by more than 30 lb the compressor will turn on until it reaches that new setting. If you adjust it lower then you need to let air out until it comes on again. Having a tank gauge installed is the best way to check the pressure.
I think the issue is whether you are turning the regulator up to 12 bar or down to 12 bar. When the pressure is higher in the keg than you are setting the regulator at, you cant get a good reading on the pressure gauge without bleeding some pressure off to get below your target pressure. You basically turned the regulator down too far and it ended at 8 bar.
If you are increasing the pressure from 8 to 12 bar, you should be OK.