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Vacuum Problem

Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.

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Vacuum Problem

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syfir
Agilent 5973N/6890 with diffusion pump. I tuned the ms today using standard tune and the foreline pressure is at 22 mtorr, same as last week. Is this a cause for concern? The other GC/ms we have is steady at 55mtorr for years.

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Rick
Hi!
22 mtorr is possible...what is the flow of your carrier gas?
55mtorr for a flow of 1ml/min is o.k

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haiedc
Err, 22 mmTorr is possible, but I have never experienced unless you block the GC interface. Check your GC column flow.
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