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Harvey Ghesser
10-07-2009, 2:35 PM
I'm setting up a vacuum chuck and I have a gauge that reads in PSI. Is there a reason I need one that reads inches of mercury or am I being too OCD about this? The conversion factor is 2.04 X PSI =inches/hg.

Thanks to all!

Harv
Steve Frederick
10-07-2009, 2:45 PM
If it reads in minus PSI, why not?
And what's wrong with being OCD?:rolleyes:
I'll never forget how many steps go down to my shop.:eek:
Leo Van Der Loo
10-07-2009, 2:53 PM
Harvey it is only a scale that gives you the info to know where about you are in the amount of vacuum you have at a given time, doesn't matter if you use PSI, KG/cm² or Barr or whatever, it is only when others are involved that the numbers used do make cense to them.
For ease of use, total vacuum would be about 15PSI, and you can glance easily where you are at say 10PSI, about 2/3 of maximum, (something like 20"HG), should work just fine :)
Harvey Ghesser
10-07-2009, 3:04 PM
Steve and Leo:

Thanks so much for your responses. It's much appreciated. :)

Harv
curtis rosche
10-07-2009, 4:33 PM
a psi gauge doesnt work for vacuum does it? since a psi gauge is for outward preassure, and vacuum is inward preassure?
go to www.burdensurplus.com (http://www.burdensurplus.com) they have vacuum gauges that are like $4
Richard Madison
10-07-2009, 6:01 PM
Harvey,
Curtis makes the point that you need to be sure what you have is a vacuum gauge and not a pressure gauge. As others have said, the units of measurement don't really matter as long as it is the correct type of gauge for the application.
Harvey Ghesser
10-07-2009, 9:07 PM
Thanks Curtis, Richard....I think I'm on the right track now!
Leo Van Der Loo
10-07-2009, 11:39 PM
I had a gauge that did give both as it would swing left for vacuum and right for pressure, used on a ventury vacuum system that was used to evacuate volatile liquids that then could be switched to pressure after removal to the holding tank to return the liquid back or to an other storage tank, but yes he should have a vacuum gauge for this setup.
Greg Ketell
10-08-2009, 10:12 AM
BurdenSurplus.com doesn't seem to exist any more. It seems to be a squatter page now.


a psi gauge doesnt work for vacuum does it? since a psi gauge is for outward preassure, and vacuum is inward preassure?
go to www.burdensurplus.com (http://www.burdensurplus.com) they have vacuum gauges that are like $4
Harvey Ghesser
10-08-2009, 10:43 AM
Try www.surpluscenter.com (http://www.surpluscenter.com) It's the same business.
Jim Podsedly
10-08-2009, 10:51 AM
THis is the one i bought from surpluscenter:

30" 2" DRY VACUUM GAUGE LM #2141
https://www.surpluscenter.com/item.asp?UID=2009100809490784&catname=&qty=1&item=2141

Works fine.
phil harold
10-08-2009, 11:21 AM
I had a gauge that did give both as it would swing left for vacuum and right for pressure, used on a ventury vacuum system that was used to evacuate volatile liquids that then could be switched to pressure after removal to the holding tank to return the liquid back or to an other storage tank, but yes he should have a vacuum gauge for this setup.

at car shops you can also get vacuum / pressure gauges

I have one...