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  1. #1
    Join Date
    Jun 2007
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    Which vacuum gauge is right?

    A few days ago a co-worker and I got to do a evaporator coil and condenser coil changeout under warranty, due to the original coils leaking. Both of us are tool-aholics and we wanted to compare vacuum gauges.
    Our vacuum setup included: fresh vacuum oil, Appion 3/8 x 1/4 hoses, Appion CRT's, standard 6 cfm vacuum pump, Yellowjacket vacuum tree at pump and all fittings with Nylog.
    This is about 20 mins in.
    My Bluvac never dropped below 1000 microns picture shows at 1037 microns. His JB held steady within the 270 range. Now being that the system was mainly new and only 2 places for oil and products of old refrigerant to stick around were compressor and lineset. Which gauge is right? We weren't expecting exact #'s but something within a ballpark.
    We had a 3rd micron gauge a Fieldpiece and it was down in the 400 range.
    What do you guys think?
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    Any fool can know. The point is to understand. Albert Einstein

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