| 摘要 |
PURPOSE:To simplify operation by reducing an occupying area and to reduce a reading error, by using a semiconductive pressure sensor as a detection element and digitally displaying the output signal of the sensor while also operating said sensor as a pressure switch. CONSTITUTION:A semiconductive pressure sensor is arranged in a housing and a fluid pipeline for introducing a pressure fluid into the pressure sensor is provided and analogue output is taken out from an output terminal OUTPUT2 through an operational amplifier A1. A liquid crystal display part 60 displaying the pressure of the fluid is mounted on one surface of the housing and the pressure of the fluid detected by the pressure sensor is taken out as an electric signal to be subjected to voltage/frequency conversion and pressure is displayed on the liquid crystal display part 60 from a gate circuit G through decayed counters C1, C2, C3 and a decoder to output a digital signal from a terminal OUTPUT1. Further, when input analogue voltage is more than or less than the set voltage VT set by a variable resistor VR3, a control signal or alarm is outputted from a terminal OUTPUT3.
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