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  1. miller863

    PSIA vs PSIG

    Please help me out here.... I have a pressure controller and vacuum pump and I can pull 0.008 PSIA on my system. However, when I switch the display to read PSIG, it reads -14.0796 PSIG. If -14.7 PSIG is an absolute vacuum, why wouldn't the display (In PSIG mode) read -14.7 - 0.008 = -14.692...

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