Recent content by paulmars

mount it inclined 10:1 for 10 times the resolution. https://www.amazon.com/dp/B0038QHTK2/?tag=pfamazon01-20 its graduated at 0.25 intervals and you can easily judge 1/5 of that. So, 0.25 included 10:1 the 0.25 would then be 0.025 and I could fairly accurately judge 1/5 of that or 0.005. thoughts?

maybe u right. I am unhappy with dwyer email support on other issues. I asked what the accuracy was, since their page lists 2,3, and 4%. response was for that specific unit 2%. Still, I don't like used and new costs too much. Interesting is that dwyer also lists the same 3% for mark ii mdl 25...

yes many flame heating (oil and otherwise) forum ppl suggested the dwyer mark II model 25 and I almost bought one. However, the accuracy makes it really useless. I even tried to get the manu to tell me if it is really effectively more accurate that then, just in the range that I need, after I...

"outlined, 3% of full scale is +/- 0.008" w.c. (0.008" in 0.25") so obtaining accurate measurements down to 0.02" w.c. is problematic in either case." The gauge I referenced is FS accuracy 2% which is 0.005. I am ok with +/-0.005.

Dwyer Mark II (model 25 shown) accuracy is +/-0.09, so a reading of -0.02 could actually be anywhere between -0.11 to +0.07. I confirmed that with dwyer.

they charge 99$ "Don't know what Dwyer charges, but sending it back and having them check & correct calibration and provide a NIST calibration certificate"

"Im using it in the 0.02 to 0.03 negative and positive ranges." Actually adjusting the flue to allow a little air in is to slow down the exhaust so more heat gets into the house and less out the chimney. Also to cool the exhaust (nobody wants a chimney fire).

+/- 1/2 division.

once inch of water equals 1" of water height in a glass liquid manometer. So, 0.05 inches of water equals 0.05". try and measure that accurately w/o special equipment.

this would be a VERY small amount of water! The inaccuracy of the water measurement would invalidate the results.

quoting still don't work. "What gives this option?" starting new topic on this site

and how to add or remove such a small and precise amount of wtr?

"I mean, what equipment will it be mounted to?" A flue. Is this relevant? "What is creating the pressure difference?" An oil heater. Is this relevant? "Do you have an already-existing and calibrated gauge that you can use to check the accuracy of this new gauge?" I am not going to answer that...

"Im using it in the 0.02 to 0.03 negative and positive ranges."

+/-0.005