| 摘要 |
PURPOSE:To obtain a flow rate measuring device having a small amount of consumption and multiplied reliability with a simple constitution, by performing a time division multiplexing process. CONSTITUTION:A switch 33 of an energizing circuit 31, a switch 51 of an electromagnetic flow rate converter 11, etc. are switched via a timer 23. Then the energizing coils 5A and 5B of electromagnetic flow rate detectors 1A and 1B are energized with time division by the DC power which is obtained by converting the AC power supplied from a commercial power supply 21 with a rectifier 25, a capacitor 27, etc. Then the frequency signals corresponding to the flow rates which are detected with time division by the detectors 1A and 1B are multiplied via the switch 51 and processed by an F/V converting circuit 55, a reversible counter 59, a pulse code converter 63 and an optical signal converter 67 to be transmitted via an optical fiber without receiving any effect of noises. The circuits and component parts can be shared with each other, and the number of transmission lines is not increased. As a result, the power consumption is reduced with multiplied reliability for a flow rate measuring device with a simple constitution. |
