I just bought a 0-60 pressure gauge from a farm store. Checked it with three other gauges and four different readings. Some 5 lbs difference. Is there any way to check the accuracy of my gauges without buying a precision meter? I need to get in the 1lb accuracy range. Am I kidding myself with what I have?
- Thread starter MF294-4
- Start date
parisspringstom
Member
Get a guage where the desired pressure reads in the middle of the guage.
The short answer to your question is yes, you are kidding yourself. To answer your first question, sure send your gauge to a calibration lab, they will calibrate your gauge and send you the certs. But, the gauges you get from a farm supply or the like are at best +/- 3% accuracy and probably more like +/- 5%. Here is a link to one that will get you where you want be, but not as cheap as Farm and Fleet or Tractor Supply. Hope this helps.
http://www.omega.com/pptst/PGT.html
http://www.omega.com/pptst/PGT.html
Steve@Advance
Well-known Member
This might be an option:
http://www.zoro.com/dwyer-digital-pressure-gauge-100-psi-dpga-08/i/G5221562/
http://www.zoro.com/dwyer-digital-pressure-gauge-100-psi-dpga-08/i/G5221562/
Man you got that right cliff. Just a few bucks to get it right!? Wooof! Now what I did is found a ship or industrial salvage yard and go through their parts room with all of the gauges they pull out of stuff. There are some damn expensive gauges there for like 15 to 25 dollars. I have 0-60 0-100 0-120 and 0-160 gauges. They all match each other and are adjustable. Used on the water system in the house and all of my air compressor stuff. If you can go industrial! They all work great and a real winner is if you can find the oil filled ones!
WHAT are you doing that requires precision accuracy? If, in fact, you need that, it will cost you.
But for an old tractor, if it has at least 10 or 15 psi of oil pressure, all will likely be well, and a 5 psi gauge error at, say 30 psi ain't gonna kill anything.
Another this is linearity vs. full-scale accuracy.
Even if your cheap gauge reads 60 psi at 60 psi, what's it gonna read at a true 30 psi?
But for an old tractor, if it has at least 10 or 15 psi of oil pressure, all will likely be well, and a 5 psi gauge error at, say 30 psi ain't gonna kill anything.
Another this is linearity vs. full-scale accuracy.
Even if your cheap gauge reads 60 psi at 60 psi, what's it gonna read at a true 30 psi?
ObsoElitist
Member
Are you talking about a tire pressure guage, or one for something else? Many types are available in a variety of qualities and accuracies.
Anonymous-0
Well-known Member
Digital" simply gives you the false sense of accuracy! There is no inherent accuracy in a digital readout gauge vs an analog readout gauge.
mf294, we had a couple of special tire gauges that we used to check all other tire gauges in the tire shop. They were designed to do this. It seems they were around 30.00 each but that has been 15 to 20 years ago. If you have an experienced NAPA store operator in your area they should be able to get you 1. Any good tire shop should have 1 or 2 in their special tool drawer, the ones we had looked like a truck tire gauge.
OldFarmTractor
Member
Find a tall structure and build a water column. A good tape measure to measure the vertical distance will give it to you dead on.
Water pressure table
Water pressure table
dr sportster
Well-known Member
Exactly
Charles in Aus.
Well-known Member
Thanks for that , filed away in the very useful tables section
DENNIS MIN
Member
oldfarmtractor,
I looked for the temperature compensation table for density.
Not trying to be a smart aleck, but that table lacks some information. I was a student of thermodynamics and found every detail was of importance.
D.
I looked for the temperature compensation table for density.
Not trying to be a smart aleck, but that table lacks some information. I was a student of thermodynamics and found every detail was of importance.
D.
DENNIS MIN
Member
All,
I rescind my response. I am mistaken.
D.
I rescind my response. I am mistaken.
D.
Buy or make a dead weight tester. You can buy the most expensve gauge around but only a tester will tell you if its still accurate.
https://www.youtube.com/watch?v=10Seo_TVJSs
jimg.allentown
Well-known Member
If a gauge is properly calibrated for both ends of the scale, it will be accurate in the middle. I learned this from calibrating gauges for several years with a very expensive dead weight tester. Almost all gauges use a bourdon tube. This component is by nature a linear device. Once the high end and the zero are accurate, all pressures in between are very accurate.
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