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- Posts: 102
- Joined: Tue Oct 06, 2020 10:01 pm
- Location: Australia
My colleagues and I had a difference of opinion regarding the vent valve. I usually open the vent valve to properly vent the analyser then closing it before leaving the system powered off overnight. Mainly I'm concerned about oil vapour being sucked back into the analyser chamber from the (off) roughing pump and contaminating the thing.
However, they wanted to keep the vent valve closed the whole time to maintain vacuum in the analyser and avoid introducing atmosphere (and thus air/water) into the thing. What would you do in this instance?
Also, I noticed that some of us don't switch off the GC interface/transfer line heater before venting. What are the negative effects if that's not done? It suggests to do it in all the Agilent manuals and also the software.