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Re: Vacuum Pump
Posted By: Stephan Krasner In Response To: Re: Vacuum Pump (SVP Neon Equipment)
Date: Friday, 9 July 2010, at 9:59 p.m.
> Beyond that, has it been tested with a high
> vacuum gauge (not a 0-30" vacuum
> gauge)? If so, what is the base pressure
> (ultimate vacuum) achieved? What brand and
> model vacuum gauge was used for testing?
> When was the last time the vacuum gauge was
> calibrated? How old is the pump? Will the
> seller guarantee the pump for at least 6
> months? These are a few questions to start
> with. If it hasn't been tested and/or they
> are not willing to give you some kind of
> reasonable warranty, don't waste your time
> and money (We give a one year warranty on
> rebuilt Welch 1402's - the same as a new
> one). There are plenty of junk Welch 1402's
> out there that people are trying to get rid
> of, so be careful. And if it's an eBay item
> you are looking at, chances are the seller
> won't be able to answer any of these
> questions because they don't know what they
> have. They just found it along with other
> surplus stuff.I'm using the pump for processing normal 10 and 12mil tubing. Nothing elaborate like cold cathode or plasma work.
The guy I found is selling it for $150 and I got to see the demo in person. I'm not sure how good his gauge is, it's probably a cheap one, but it was meant for high vacuum. The range was -75 to +50 the needle went down to -71 cm hg when tested. I'm not sure what this would be in millitorr. Its not an old pump (MFD 2001) but he told me it got heavy use.
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