| 摘要 |
PROBLEM TO BE SOLVED: To monitor whether the quantity of use of a medium and the state of usage are safe or not by accurately measuring the quantity of flow at the time when apparatus is not used. SOLUTION: While time is counted by a timer means 24, after the lapse of a predetermined time, a channel 1 is periodically closed by a breaking means 26 in a gas apparatus not used state, the flow velocity of a gas medium is measured, and the quantity of flow converted by a flow quantity computing means 21 is stored in a flow quantity correcting means 25 as a new correction value of the quantity of flow. After this, the channel 1 is opened, and the flow velocity is detected by a flow velocity detecting means 17 with the apparatus in a state of being used. Then a flow quantity computing means 21 performs the conversion of the quantity of flow, and a correction value of the quantity of flow is stored in the flow quantity correcting means 25 so that the converted quantity of flow may be corrected by the new correction value of the quantity of flow.
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