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Re: Daco Belt Driven Vacume Pump

Posted By: SVP Neon Equipment
Date: Monday, 4 October 2010, at 11:59 a.m.

In Response To: Daco Belt Driven Vacume Pump (Ironman)

> Does anyone Know what the drift rate should
> be on this pump?? I have an E.G.L. digital
> gauge: the pump will pull a work piece down
> to 01.42 (12mm tube),but when the main
> stopcock on the (Daco) manifold is closed,it
> will drift (or leak) back up to 19:00 within
> 2 mins.

> Seems excessive OR there are leaks in the
> workpeice itself?? Thanks

IMO the inexpensive (regardless of the price they are sold for) digital vacuum gauges being offered to the neon industry by some neon equipment suppliers are, to put it mildly, junk. I won't get into details, but if you knew how they are constructed and the, um, "method" used to calibrate them you would cringe. Not to mention the fact that the circuitry in these things do NOT like the high voltage EMF produced by the bombarder. Beyond that, you did not mention enough info to offer any advice. For example, what is the per minute rate-of-rise (drift rate) of the manifold without a neon unit connected to it? How many hours non-stop has the manifold outgassed before doing a rate-of-rise test? Etc., etc.

For a clean, well outgassed manifold the rate-of-rise should be less than 1 micron per minute.

SVP Neon Equipment

Messages In This Thread

• Daco Belt Driven Vacume Pump -- Ironman -- Sunday, 3 October 2010, at 10:08 p.m.
  • Re: Daco Belt Driven Vacume Pump -- TerryM -- Monday, 4 October 2010, at 1:08 a.m.
  • Re: Daco Belt Driven Vacume Pump -- SVP Neon Equipment -- Monday, 4 October 2010, at 11:59 a.m.
  • Get your problem resolved? *NM* -- SVP Neon Equipment -- Friday, 8 October 2010, at 11:59 a.m.

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