What is the proper formula to use to calculate water meter efficiency on a test bench ?
What is the proper formula to use to calculate water meter efficiency on a test bench ?
(OP)
Hi,
The title pretty much says it. I am using a Ford Akron test bench for the first time. I got my readings but not sure what formula to use to calculate the meter efficiency ? I'm not looking for the answer but want to learn how to calculate the answer myself. I even called Ford Customer service and they could not answer.
My test was as follows:
1/4 gpm 1 cubic foot
Meter Start-42.21 ft3
Meter Finish-43.18 ft3
2gpm 1 cubic foot
Meter start-43.24 ft3
Meter Finish-44.25 ft3
15gpm
Meter Start-44.45 ft3
Meter Finish-54.47 ft3
I realize looking at these numbers this meter is probably within spec. It was pulled from a low usage account that I found to have a bypass so I need to be able to give an accurate report with percentage numbers.
Thank You
The title pretty much says it. I am using a Ford Akron test bench for the first time. I got my readings but not sure what formula to use to calculate the meter efficiency ? I'm not looking for the answer but want to learn how to calculate the answer myself. I even called Ford Customer service and they could not answer.
My test was as follows:
1/4 gpm 1 cubic foot
Meter Start-42.21 ft3
Meter Finish-43.18 ft3
2gpm 1 cubic foot
Meter start-43.24 ft3
Meter Finish-44.25 ft3
15gpm
Meter Start-44.45 ft3
Meter Finish-54.47 ft3
I realize looking at these numbers this meter is probably within spec. It was pulled from a low usage account that I found to have a bypass so I need to be able to give an accurate report with percentage numbers.
Thank You





RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?
Thank you
RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?
http://www.fordmeterbox.com/documents/flyers/Test-...
RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?
I need the formula so I can do more than one in the future plus it's hard to use the percentage chart on the sight glass on low flow tests. It takes forever so we use the auto stop which stops it at 1 ft3 on both low and med flow.
So if I did this correctly..
Test 1: 1/4 gpm=97%
Test 2: 2 gpm=101%
Test 3: 15 gpm=100.2%
Is this correct ?
RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?
Moreover, accuracy is typically defined as (measurement-truth)/truth and expressed as a percentage, but obviously, your test bench has other ideas.
So, your numbers should be -3%, +1, +0.2% in a normal universe
The manufacturer does not claim any accuracy specifications for the work bench, but not is perfect, but it may be that the instrument's accuracy is good enough to be negligible for these measurements.
TTFN

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RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: What is the proper formula to use to calculate water meter efficiency on a test bench ?