I am trying to diagnose an air leak in my system.
All three instruments below share the same carrier gas tank:
|1.||New GC-TQ (HES)||Yes||1.01%||0.09%||0.35%||41570936||420402||38728||144337|
|2.||Old GC-TQ (HES)||No||6.28%||20.81%||77.57%||760063||47728||158190||589573|
|3.||GC-MS (single quad)||Yes (H2O saturated)||6.70%||1.00%||40.65%||32344||4839||196224|
- System 2. and 3. have air leaks.
- System 2 electron multiplier is aging (max gain factor in autotune report is hovering around 600-900)
- I confirmed the leak is not coming from the MS side of systems 1. and 2. by capping the inlet side of the column and achieving low nitrogen readings.
- Shutting off the gas supply to system 2. and 3. at the EPC resulted in lower nitrogen abundance readings.
- I changed the gas cylinder and the readings are still high
- Used a leak detector to check all swagelok points in the gas lines (there is lot of them) and couldn't find any obvious leaks.
What else can I do to confirm where air leaks are coming from in system 1. and 2.?