| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow measuring method capable of measuring the flow rate of a fluid simply and highly accurately with high rangeability, and a pressure governor used therefor. SOLUTION: A microphone is disposed on the body 31 of a main governor 30 so as to face to a region A between apertures 33A, 33B. The microphone detects the sound pressure level of a sound wave generated by passage of gas between valve elements 34A, 34B and the apertures 33A, 33B and outputs it to a microcomputer. A pressure sensor detects the primary pressure and outputs it to the microcomputer. The microcomputer operates the flow rate of the gas flowing in an upstream side conduit 10 based on the frequency and the sound pressure level of the sound wave detected by the microphone and the primary pressure detected by the pressure sensor, and displays the operated value on a display part. COPYRIGHT: (C)2004,JPO&NCIPI
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