| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow measurement control apparatus reducing the power consumption by automatically switching between high-accuracy flow measurement and low-power-consumption flow measurement, when a measurement control unit is set as an independent device. SOLUTION: A flow rate of gas and fluid passing a channel 10 is determined by a propagation time difference decision means 22 using the difference between the downstream propagation time and the upstream propagation time. When the flow rate of the gas and fluid is determined lower than a certain value, measurement is performed by a low-power-consumption measuring means 24. When the flow rate of the gas and fluid is determined to be the certain value or higher, measurement is performed by a high-accuracy measuring means 23. When there is no flow of the gas and fluid, measurement is performed by a measuring means of low power consumption by the low-power-consumption measuring means 24. When there is a flow of the gas and fluid, measurement can be performed with a high measuring accuracy by the high-accuracy measuring means 23. The power consumption can be reduced as a system even when a measurement unit is used as an independent device. COPYRIGHT: (C)2011,JPO&INPIT
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