national multiple family submetering and allocation billing program ...

Table 8.1 Comparison of testing issues
Element Standard POU Meter Manufacture Stance
Meter Test for accuracy in
orientation application conditions
Same
Accuracy Normal Flow: +/-1.5%
Low flow: + 1%, -5% *
Under different test
conditions † : +/-1.5%
Normal Flow and ideal conditions: +/- 1.5%,
Low Flow: +3%, -5%
Under different test conditions: +3%, -5%
Temperature Up to 150 o F Up to 135 o F
Pressure From 20 psi to 120 psi From 20 psi to 80 psi ‡
* The ASME accuracy test at low flow is conducted at 0.1 gpm for a -5% accuracy range. The AWWA accuracy
test is at low flow of .25 gpm for a ½” meter for a –5% accuracy range.
† Such as meter orientation, changes in temperature, bent piping, etc.
‡ At least one manufacturer is ok with the pressure test at up to 120 psi.
Meter Labeling/Identification
Committee member comments:
- Each POU meter needs to have certain labeling information: model and serial
number, name of manufacturer, date of manufacture, meter orientation (vertical,
inclined, horizontal) and temperature criteria.
Conclusions based upon committee’s comments:
POU meters need to have the name of the manufacturer, model and serial number, and
specifications for meter orientation and temperature conditions.
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