| 摘要 |
A pump station flowmeter is disclosed including a pump status comparator for creating level status without being connected to any level sensors by comparing pump status to a list of association between expected pump status and levels. The wet well dimension, pump status signals, clock signals, level status are recorded in memory before being used as input to a flow calculator which calculates inflow and outflow. A flow rectifier readjusts the inflow and outflow according to a variable proportion of the difference between the average of many outflows and one outflow, and using this difference to readjust a variable tolerance and the variable position. This optimizes accuracy according to each specific installation. Abnormal pump operations are confirmed when a predetermined number of possible abnormal pump operations occur in a row are detected by comparing the outflow to the average of many outflows plus or minus the variable tolerance. A maintenance status is declared when an outflow calculated is physically impossible so the inflow calculated is the time of operation of the pumps divided by the time of maintenance status. Alarms are generated when the outflow or the inflow is over or under predetermined values. Outflow can be replaced by a coefficient if the wet well dimension is unknown sot he flowmeter can still be used to generate alarms.
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