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ion gauge pressure fluctuation

Question asked by deepachoudhry on Jul 9, 2020
Latest reply on Sep 13, 2020 by mhardacker

Hello everyone

Does anybody help with ion gauge pressure fluctuations?

I am using GC 5890 and HP 5972A with the foreline pressure reading 37 mtorr with the column flow 1.32 ml/min and He gas flow at 55 psi. Ion gauge pressure showing fluctuation between 2.1*10-5 to 2.4*10-5.

Can anybody suggest the reason of the fluctuation in the pressure?

Thank you.