I am a new faculty and there was a GC system (7890A G3440A) in a storage room which had not been used for years. I purchased a headspace autosampler (7697A) a few month ago, and had it installed.
The problem is the helium gas only last for 10 days even with 3 ml/min total gas flow at the standby condition, 1 ml/min for the front column and 2 ml/min for the back column.
I guess it's leaking somewhere. Is there any protocol you can recommend to resolve the issue?