| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption and improve the measuring precision by providing a precise and rough measuring sections, lengthening the sampling period in the precise measuring section and monitoring the threshold in the rough measuring section in the sampling intervals. SOLUTION: In the rough measuring section, the repetitive measuring number is small (e.g. 8) and the sampling period TL is short (e.g. 1 sec) while in a precise measuring section the repetitive measuring number is large (e.g. 256) and the sampling period TH1 is long (e.g. 12 sec). The measuring sampling in the rough measuring section is disposed in the measuring sampling intervals of the precise measuring section. In the precise measuring section a stationary flow rate (e.g. existence of a pilot or gas leakage, etc.), is measured at a rough sampling period TH1 but once the flow rate increases and a specified threshold flow rate VTH is detected in the rough measuring section, the sampling period in the fine measuring section is shortened from TH1 to TH2 (e.g. 2 sec) to measure the varying flow rate, without missing.
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