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Re: manometer gauge?

Posted By: John Anderson
Date: Wednesday, 25 October 2006, at 12:43 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.


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