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PCI tune "Improper masses for mass axis calibration" error code on 5977c

mannu002

PCI Methane tune "Improper masses for mass axis calibration" error code on 5977c. Seems methane not being detected. Not sure where to go from here after testing out issues below. 

Have tried the following troubleshooting: 

  • Confirmed ms function with EI source.
  • Checked that the masses are correct 17, 29, 41 for methane tune.  
  • No air or water peak
  • Tightened connections
  • checked the lines for leaks. 
  • Used different tune files to see if bad tune file. 
  • Interface tip seal examined and reinstalled.  

History:

-Instrument installed back on 1/10 and tuned

- CI source not used during this time 1/10-3/13

- CI tune on 3/13 and noticed 29 abundance significantly decreased 

- No peaks detected in sample run 3/13

-4/11  methane tune:

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    Update: I checked filament and looks fine. Weird when switching from EI to CI source the tune fails 3x in a row and then passes every time after that. This happened twice after switching source. The tunes that pass though do not seem like everything is fine though and again seems like a methane flow issue. Methane is at 2x (~40%) what recommended value is (20%) and show max emission & electron energy values. Purged lines for a longer time per another suggestion but still did not change. Samples run though seem to be working okay though. Any further suggestions would be helpful out side of it being a reagent flow controller issue

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  • 0

    Update: I checked filament and looks fine. Weird when switching from EI to CI source the tune fails 3x in a row and then passes every time after that. This happened twice after switching source. The tunes that pass though do not seem like everything is fine though and again seems like a methane flow issue. Methane is at 2x (~40%) what recommended value is (20%) and show max emission & electron energy values. Purged lines for a longer time per another suggestion but still did not change. Samples run though seem to be working okay though. Any further suggestions would be helpful out side of it being a reagent flow controller issue

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