MS oil contamination?

[BCBC]

Thank you. I'll let you know after I change the rough pump oil.

[BCBC]

Changing diffusion pump oil and cleaning the pump did not change anything on the autotune.
Wiped the analyzer chamber again with Methylene Chloride. Still no change.

[BCBC]

Changing out the rough pump vacuum hose and convectron gauge did the trick. The gauge had too much oil to clean out with solvent which I have done in the past.

[Don_Hilton]

Good to hear you have it solved!

[BCBC]

Thanks for the help.

[See77777]

I had a backstreaming incident as well. I cleaned everything multiple times: hexane, ipa, 1nhcl, water, lcms water, ipa, meoh. My signal is too low. Can anyone help pinpoint my issue?