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Thread: Gauge accuracy

  1. #1
    Join Date
    Dec 2006
    Posts
    30

    Gauge accuracy

    What is a good way to check your gauges to know they are reading correctly? I usually check them against each other to make sure they read the same against the same pressure, but how do I know if that is correct?

    Anyone have some info on a way to check them to know they are reading correctly?

    thanks
    Josh

  2. #2
    Join Date
    Dec 2006
    Location
    Goodyear, AZ
    Posts
    197
    Take a can of R-22 and set in an air conditioned office over night. Take the temperature of the tank, put your gauges on the tank and check the PT. An R-22 at 72 degrees will have a pressure of 125.5 psig at sea level. This is how I checked the refrigerant that I have recovered for non-condensable.

  3. #3
    Join Date
    Oct 2010
    Location
    Baton Rouge, LA
    Posts
    1,119
    zero them out then get a nitrogen regulator set it at 200 psi, connect your hose and see it if reads 200 psi.
    If you're too "open" minded, your brains will fall out.
    Artificial intelligence is no match for natural stupidity.

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