1: A leak before the gas trap where carrier gas is leaking out and oxygen is diffusing in. The O2 will be scrubbed by the trap and the N2 will pass through.
2: A contaminated tank of carrier gas that has N2. This can show at any point in the gas tank depletion onece the lighter gas layer is becoming depleted.
Try varying the carrier gas flow to see if you see a change in N2 abundance. For example if you are at 1ml/min, increase to 1.5 ml/ min and see if the N2 value goes up in the air and water check. This will confirm that the issue is with the carrier gas stream. It will still not give you complete confirmation of a contaminated tank. Changing the tank and purging the line may be your best bet.
We are glad this was helpful! We are sorry this was not helpful. If you still need assistance please create a community post or contact support. To help us improve, please provide any additional feedback.
For full details of how we will treat your information, please view our privacy policy.
