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Re: manometer gauge?

Posted By: John Anderson
Date: Wednesday, 25 October 2006, at 4:43 a.m.

In Response To: manometer gauge? (shocking)

> Volunteered to help someone set up a
> manifold and I'm blowing it. Seems
> everything is pumping down but there is too
> much dancing in his manometer
> gauge...stopcock seems tight but
> occasionally gauge rises on the right! He
> has an older gauge that looks repaired in a
> few spots with some excess grease floating
> about. Could this be causing it or do I have
> a leak somewhere? The trodes are getting hot
> too quick but like I said everything pumps
> down okay...until the fill. As soon as I
> close the manometer stopcock the rising
> begins.

Let the manifold pump down for several hours. If the manometer rises just as quickly as before you probably have a leak. You can tell the difference between leaks and outgassing by observing this rising pressure over time. A leak will be fairly constant, whether the pump was just turned on, or you've been pumping down for hours. Outgassing becomes less and less with extending pumpdowns.

Messages In This Thread

• manometer gauge? -- shocking -- Tuesday, 24 October 2006, at 10:10 p.m.
  • Re: manometer gauge? -- John Anderson -- Wednesday, 25 October 2006, at 4:43 a.m.
  • Re: manometer gauge? -- SVP Neon Equipment -- Wednesday, 25 October 2006, at 2:40 p.m.
    • Re: manometer gauge? -- shocking -- Saturday, 28 October 2006, at 11:50 a.m.

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