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:
