| 摘要 |
PURPOSE:To carry-out flow-rate control by using a detected discharge pressure as input in a liquid feeding apparatus and conversion-calculating said input to the total discharge flow-rate of a pump and installing a circuit for controlling the revolution speed and a circuit for indicating the result of calculating in the control circuit as flow-rate. CONSTITUTION:The signal supplied from a pressure sensor 8 is conversion-calculated to the total discharge flow-rate by a microcomputer 19, and a pump-speed instruction is transmitted. The microcomputer 19 outputs a signal from an input/ output port 24 into the flow-rate instruction apparatus 12 such as a CRT, printer, etc. through an interface 29, and flow-rate indication is performed. Therefore, flow-rate indication and flow-rate control are permitted with the simple circuit constitution without installing a flow-rate sensor, and the small-size and lightweight constitution of apparatus can be obtained.
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