| 摘要 |
In a sensor of a sensor unit in which working voltage or calibration voltage is supplied through a single input end, working voltage can be stably supplied to the sensor after initial calibration. The sensor unit includes a voltage stabilizing circuit 7 for stabilizing a voltage value of a supply power source to said working voltage, and a wiring 8 for supplying said calibration voltage to the sensor 4, which are provided parallel to each other between the input end 44 of the sensor 4 and a power source connecting end 51 for the sensor on the circuit board 51, and a switching portion 82 which can disconnect the wiring 8, wherein an access hole is formed in the housing through which the switching portion 82 is accessible to disconnect the wiring 8.
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