| 摘要 |
PURPOSE:To enable the switching of several kinds of unit displays in a manometer by an output signal of a microcomputer, by providing the manometer with externally adjustable variable resistors. CONSTITUTION:A swelled part 16 formed on a base sections 14 of a manometer 10 is fitted into a fluid pipeline, while a screw is inserted through inclined holes 30 and 32 to mount the base section 14 along on a female threaded part. Then, a cover member 12 integrated with first - third printed circuit boards 38-72 or the like is fitted into the base section 14. As a result, a fluid pipeline comes to communicate with a semiconductor pressure sensor 39 and the manometera 10 is fastened on the fluid pipeline. Then, a control 18, namely, a variable resistor RV1 is adjusted from outside to set a desired fluid pressure. To switch pressure unit of the manometer 10, the resistor RV1 is connected to a microcomputer 64 and an voltage value involved in a set angle of the resistor RV1 is judged and processed to switch pressure units continuously. This enables the switching of several kinds of unit displays of the manometer 10.
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