| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow sensor with a high sampling rate in spite of low power consumption and a gas meter applying the same. SOLUTION: The flow sensor installed in a flow path for a fluid is provided with pressure fluctuation detecting means 18, 26 arranged in the flow path 14 for detecting pressure fluctuation in the flow path, and a flow detecting means 16 arranged in the flow path 14 and driven by the first sampling rate higher than before in response to pressure fluctuation detection of the pressure fluctuation detecting means. By this means, the flow detecting means with the high power consumption is usually driven by the lower sampling rate or stopped, and the pressure fluctuation detecting means with the low power consumption monitors the pressure fluctuation in the flow path. Once the pressure fluctuation is detected, the flow detecting means is driven by the higher sampling rate, which enables highly accurate detection of a flow rate waveform. Accordingly the gas flow rate waveform when lighting a gas appliance or the like can be accurately detected while restraining the power consumption. COPYRIGHT: (C)2004,JPO
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