Which pressure gauge for a pop tester?

[pdrayton]

I thought I saw someone give the specs and a part number for a pressure gauge from McMaster.com that was suitable for a home made pop tester.

I've searched and searched and can't find it.

Do you know the part number?

Or what the specs are for a good pressure gauge for a pop tester?

I know it should go to about 3000 psi and be accurate to about 2%. But should it be full of glycerin? Is there one with a max pressure needle for cheap?

McMaster.com has this one - glycerin filled, 0-3000 psi, 1% accurate for $16 PArt # 3845K1

Grainger has some too - but they are 2% accurate.
http://www.grainger.com/Grainger/wwg/itemDetailsRender.shtml?ItemId=1613549317

Any thoughts from the experts? Thanks.

[jbaj007]

I made a pop tester and the gauges that you show are MUCH nicer than mine.
They would work fine and you would have a really nice tool when done.

If I had one thing to change on mine though, it would be to find a gauge with a max pressure needle. I have not found one cheap. I'd hold out for a while to try to find one if you have the time.

[pdrayton]

Thanks JBA.

Some guy put up a post about putting a needle valve or something on the gauge so you could let the pressure through slowly. I guess that works for the weep test.

Then some other guy put up something about putting a grease fitting after the valve. Since it is a one way valve, it will hold the highest pressure i.e. the pressure that the injector released at. Sounds good, but then how do you release the pressure again?

[jbaj007]

The valve is for the leak off test. See this, very informative:
http://www.peachparts.com/shopforum/showthread.php?t=155294&highlight=leak

Clever idea on the one-way grease valve, but you would have to plumb a valve controlled bypass around it to let off pressure (or something like that but smarter )

[pdrayton]

I've been looking for a pressure gauge with a hold needle - haven't found ANY! The extra plumbing to put a one way valve and a ball valve to release pressure will cost about an extra $70. Not sure if it's worth it.

Anybody know where to get one of these gauges?

Thanks

[vstech]

Hmm, my ampprobe/voltmeter has a max reading scale... I wonder if there is a digital sender that could be plumbed in. then just use the meter as a readout... hmm. it's worth looking for.
John

[mobetta]

I think it best to use an A grade=1% accuracy.



not mine, just a pic i found.

[864Lightning]

This looks like an interesting guage.. http://www.surpluscenter.com/item.asp?UID=2007011811523535&item=21-1652-L&catname=hydraulic
I am thinking about making a tester using a grease gun,, or just buy this new one.
http://www.hardysolar.com/shop/product.php?productid=17430&cat=0&page=1