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- Posts: 7
- Joined: Wed Apr 27, 2011 1:55 pm
We have a GC_MS from Agilent (5975C/7890A). I was satisfied with the working conditions of this instrument since a long-time (~3 years). From last few days it shows some problem. I have checked some tests,
1. Air/water leak test: It shows error divide by zero (it does not show any count for 69, 18 and 28)
2. Tune evaluation: gives error code: 222
3. Auto Tune: Gives error that either PFTBA is empty in the calibration vial (which is not the case) OR High Air Leak
I have doubt regarding the leak in the system especially around the PFTBA calibration vial.
Because, in the ideal mode the vacuum goes up to e-6. However, when PFTBA is injected it suddenly gives sharp decrease in vacuum, sometimes ~e-2 also. I also feel that PFTBA is not getting injected in the system, because I could not see any counts corresponding to the major ions (69, 219 and 502).
So, kindly give your suggestions.
Thanking you,
With regards,
Prashant