| 摘要 |
PCT No. PCT/FR97/00694 Sec. 371 Date Sep. 17, 1998 Sec. 102(e) Date Sep. 17, 1998 PCT Filed Apr. 17, 1997 PCT Pub. No. WO97/40351 PCT Pub. Date Oct. 30, 1997A method for detecting water meter malfunction and calculating the duration thereof, includes measuring the average flow rate for each volume unit detected after the preceding volume unit, comparing this average flow rate with two limit flow rates which are a first flow rate corresponding to the minimal flow rate when the meter is operating normally and a second flow rate corresponding to the minimal flow rate when the meter is operating defectively, calculating, when an average flow rate is found to be higher than the first flow rate, the relation between the sum of recorded volume units between the two flow rates and the sum to which is added the sum of volume units recorded at flow rates higher than the second flow rate, starting a clock when this relation is lower than a defectiveness threshold and stopping it when the relation is once more higher than the said threshold.
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