Open Access
Table 1
Range and meaning of each experimental flow point.
| Experimental flow points | Abridge | Realm | Hidden meaning |
|---|---|---|---|
| Minimum flow | Q1 | Q1~1.1Q1 | The minimum flow rate,Q1, is the lowest flow rate for which the meter is required to comply with the maximum allowable error. |
| Divided flow | Q22Q2~1.1Q2 | The divided flow rateQ2 between the common flow rate Q3 and the minimum flow rate Q1, is the water meter flow rate range delineation of the high zone and the low zone of the flow rate. Where the high and low zones have their own corresponding maximum allowable error. | |
| Common flow | Q3 | 0.9Q3~Q3 | The common flow rate Q3 is the maximum flow rate under rated operating conditions. Under this flow rate, the normal operation of the water meter is within the maximum allowable error. |
| Overload flow | Q4 | – | The overload flow rate Q4 is the maximum flow rate allowed to exceed the rated flow range for a short period. At this flow rate, the water meter measurement error is within the maximum and allowable error range, and the meter metering characteristics remain unchanged when the rated operating conditions are restored. |
| First attachment point flow | Q5 | 0.35 Q2+Q3 | The first additional point of flow, Q5, is an experimental flow point added to account for the large span of data betweenQ2 and Q3. |
| Second attachment point flow | Q6 | 0.7 Q2 + Q3 | The second additional point of flow, Q6, is the second experimental flow point added after Q5 to account for the large span of data between Q2 and Q3. |
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