Proper instrument to measure offset pressure of gas valve

John McArthur_2

I have a Fieldpiece digital dualport manometer but am concerned about the accuracy for sensitive negative pressure gas valve offset adjustments.

I read a post a while back about using a magnehelic gauge with a zero center and very small scale. Can someone point me to where I might purchase one? I believe it was a Dwyer but they make so many insturments, I'm unsure which to get.

Thanks in advance.

Ted_9

Me too

I know the Dwyers are good. I also saw a small Testo digital one that is good for negative gas valves like the ones you find on the Buderus GB142.

Massachusetts

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Ken D.

Pressure

Dwyer's Magnahelic in the correct scale is a very accurate and dependable instrument.

Steve Ebels_3

Testo 506

I have a couple and find them very accurate. The 506 will do + or - and differential and it's sensitive enough to read W.C." to the third decimal. I've checked it against my Mag and found it to be spot on every time. I know for a fact that Chuck Shaw uses that instrument in his work at HTP.

John McArthur_2

My fieldpiece digital reads to 1/100th of an inch. I'm just unsure of how accurate any of the digitals are.

Which Dwyer are you guys using? I think the 2300 looks like the one to get, but was unsure if it was safe for combustible gases.

Thanks guys.