| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow rate measuring system capable of accurately measuring a flow rate of a fluid, when pressure is changed by low power consumption. SOLUTION: The flow rate measuring system comprises a flow rate measuring means 9 for measuring the flow rate of the fluid, a change detecting means 18 for detecting a change state of the fluid, and a change detection control means 19 for starting a measurement of the means 9 at a time when measurement of the flow rate can be made for a fixed period after starting from the starting point with a prescribed position of a waveform of a changed value detected by the means 18 set as the starting point. In this case, the means 19 intermittently drives the means 18, compares the changed value with a reference value previously set by a change comparison means 19A, increases a driving frequency of the means 18 or continuously drives the means 18, when the change value exceeds a level of a first set value, and starts measuring of the means 9, when the change value exceeds a level of a second set value.
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