GC-MS Tune 5975 - Air and Water Leak Check


What is the acceptable criteria for the Air and Water leak check on a GC-MS?

For 69, 18, and 28, I have a relative abundance of 100, 1.61, and 1.15. This seems really low. Can you please give me suggestions as to what I should do?

Thank you!

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  • Thank you, ISH. It seems that my abundances are low for 69, 219, and 502 m/z. I have 231360, 57248, and 2577, for 69, 219, and 502, respectively. Do you have any suggestions? Thank you.

  • If you can share auto tune and tune evaluation report then i can say anything..

    Meanwhile, you can check level of PFTBA.

    Last time, when source was cleaned.

    How is purity of carrier? Sometimes, moiture from carrier or from saturated gas filter( if connected)...

  • Source was last cleaned on Sept 8 by an Agilent service engineer. Column has since been change. Do you think there is air in the column? Purity of carrier is 99.99% helium.

    Tune report should be at the following link. I have an older computer that doesn't have a PDF software.

  • Hi

    I did not get autotune report but you can go through below link to cross check ur autotune report.


  • Above one is in detail document of msd evaluation.

  • In your autotune report, can you check what is value of EM..

    By the way, i shared info herewith to compare / cross check..

  • Thank you. I am wondering if the problem is associated with air in the column/conditioning the column. The Hi-Vac also looks to be the problem.

  • Please attached autotune report..

  • Can you see it now? 

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