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actually not at all to do with air pumps

Posted By: George Vidas
Date: Sunday, 1 March 2015, at 10:02 p.m.

In Response To: Re: air pump (Mike Muldowney)

> Acrylic tubing? Have you got a link or
> anything? All I can find in acrylic is
> rigid...not ideal.

I'm referring to the clear plastic tubing / hose in hardware stores. Ye Olde Blue Or Orange Shoppe should have it in a wide range of sizes.

> Is the oil hygroscopic? Like will it absorb
> moisture? (Like automotive brake fluid.) If
> so, then I'll probably have to replace it as
> it's certainly not new....but if not then I
> think it'll be ok.

It is not hygroscopic to my knowledge.

> This sorted itself out. I think it just
> needed to settle after transport. There are
> still little tiny droplets clinging to the
> glass up both sides of the u-gauge....is
> this detrimental to operation? Are they ok
> to just ignore? Is there a way to get them
> to migrate down to the rest of the fluid?
> (Gentle heat perhaps?

I wouldn't use heat, or worry about it. The point of the gauge is to measure relative pressure changes that are happening relatively immediately. There will always be some inaccuracy if you use the gauge in rapid succession. +/- 1 CM is the margin of error at which you should begin to care, which is also the point at which some quick mental math should allow you to re-zero the gauge in your head.

> Something I noticed.....when I close the
> gauge stopcock....it registers in the
> fluid....the side under the stopcock with go
> down a little bit....it's so sensitive that
> it reads the volume change after the o-ring
> seals but the stopcock continues to tighten
> down.

You might be over-tightening the stopcock. They don't require much pressure -- you can see in fact, that the o-ring is compressing into the glass. Mark Snyder has a few great articles on care & feeding of orings. http://www.svpneon.com/technical.html

Messages In This Thread

• New to Neon and setting up shop! -- Mike Muldowney -- Thursday, 26 February 2015, at 5:04 p.m.
  • Re: air pump -- George Vidas -- Friday, 27 February 2015, at 6:51 p.m.
    • Re: air pump -- Mike Muldowney -- Sunday, 1 March 2015, at 6:36 a.m.
      • actually not at all to do with air pumps -- George Vidas -- Sunday, 1 March 2015, at 10:02 p.m.
      • Re: air pump -- Romarrk -- Tuesday, 3 March 2015, at 7:35 p.m.

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