| 摘要 |
36 In a treatment system for feeding a liquid from a tank having an outlet by a controllable pump operated cyclically, an automatic calibration/measuring system. The system is arranged for determining the volume of liquid pumped each cycle of the pump, a fluid flow measuring device and a controller coupled thereto. The fluid flow measuring device is in fluid communication with the tank. The fluid flow measuring device has a totalizer counter and batch measurement capability. The batch value in units of fluid volume or mass measurement is configured into the fluid flow measuring device. At the start of the batch, the fluid flow measuring device sends a ready signal to the controller that it is waiting to start the batch. The controller sends a start signal to the fluid flow measuring device that will initialize (zero reset) the totalizer counter and also tells the fluid flow measuring device that the batch has started and the totalizer to start the count of flow measurement. When the totalizer value equals the batch value, a batch complete signal is sent from the fluid flow measuring device to the controller. The batch complete signal defines a predetermined volume by which the controller measures and automatically calibrates this system. The controller in this system determines the actual number of cycles of operation of the pump required to pump the predetermined volume and if that number has deviated from a pre-established number. If so, the pump is controlled in response to the detected deviation.
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