| 摘要 |
The wasted current flow consumed in a current output circuit is reduced, and an effective drive is realized. A flow meter is provided with a current output circuit (16) which turns a switching element on and off and can adjust the current value in order to set the current value of output current Io flowing in two transmission lines DL to the current value corresponding to the flow rate of a target fluid for detection, and an oscillation circuit (182) in which the voltage signal generated at the pole in response to the flow rate of the target fluid for detection flowing through the flow path of a measuring tube perpendicular to an excitation coil (22) is detected by a detection circuit (34), and a power supply control signal for controlling the drive state of the switching element can be output to the current output circuit (16) so that an output current Io corresponding to the flow rate of the target fluid for detection is generated. The flow meter is designed to send the power supply control signal for controlling the turning on and off of the switching element to the current output circuit (16) from the oscillation circuit (182) so that an output current Io having a value corresponding to the flow rate of the target fluid for detection is generated in the current output circuit (16).
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