Pump gauge and Gun gauge dont always agree

Pump gauge and Gun gauge dont always agree

Joined: March 1st, 2002, 12:22 am

June 18th, 2012, 5:51 pm #1


Had a couple times in testing that the pump says 2600, and the gun says 2500

And during the later chrony sessions I tried to get a 2800 fill, and the gun says 2900.....

although it agreed both times on 3k when it was a 3k fill.......

 

edit: spelling.....

 


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Last edited by dan_house on June 18th, 2012, 5:52 pm, edited 1 time in total.
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Joined: February 24th, 2006, 12:19 am

June 18th, 2012, 9:22 pm #2

I always assumed the gauge on my Hill pump was accurate when I only had my Talon to pump up. But now that I have a P-rod, I have noticed the same thing you are seeing. The pump gauge always reads about 100 psi higher than the gun gauge. I follow the gun gauge, simply because that's where I need to worry about too much pressure, since my pump can put out more pressure than the gun can handle. Since I only fill the gun up to about 2700 psi, which is below the gun's limit, I don't sweat it too much. But it is definitely weird.
Chris
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Joined: November 17th, 2006, 3:51 am

June 18th, 2012, 10:56 pm #3

Had a couple times in testing that the pump says 2600, and the gun says 2500

And during the later chrony sessions I tried to get a 2800 fill, and the gun says 2900.....

although it agreed both times on 3k when it was a 3k fill.......

 

edit: spelling.....

 


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... od-1-1.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic
..that probably costs $14-$20 and are mass produced in the thousands. If I got them to agree to 100psi, would be thrilled....but 300psi differences are pretty common.
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Joined: May 22nd, 2007, 3:28 pm

June 19th, 2012, 4:08 am #4

I've heard it described that the sweep of a gauge can help indicate its accuracy. Something about a 0-5,000 psi gauge will give different readings than a 0-2,500 psi gauge when reading the same actual pressure. What I read was that the accuracy of the gauges has a sweet spot of sorts that it's calibrated to where at a particular pressure it's dead on. Other places along its sweep of pressures will be less perfectly accurate and this varies per gauge and per their maximum pressure variation. The widest sweep or range of gauge will give the least accurate pressures, at least in the inexpensive gauges. A narrower range of pressures may be more accurate, depending on quality. So quality, how they're calibrated and maximum pressure reading sweep play a part.
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