| 摘要 |
The invention relates to a system and method for determining a volume flow rate of fluid, particularly liquid such as sewage, comprising a conduit (4') for passage of sewage, a pivotable flap valve (2) which is mounted at an outlet (4) of the conduit and which carries a sensor means (2) which monitors the angular position of the flap valve and to provide an electronic output which is representative of fluid volume flow through the conduit (4'). In this way the state of a sewage system can be monitored.
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