| 摘要 |
PROBLEM TO BE SOLVED: To simplify constitution by discriminating presence of leakage when a low of fluid in a fluid feed passage continues for a fixed term, based on the detected result of a flow sensor provided in the fluid feed passage and detecting presence of fluid. SOLUTION: A flow sensor 12 provided on the optional position in a gas feed pipe 3 comprises a film heater part and a film detecting part, and by heating the film heater part, the flow of fluid can be detected as the increased portion of the resistance value of the film detecting part. A monitoring part 13 provided outside the gas feed pipe 3 is constituted of a main control part, a display part, and the like. The flow sensor 12 detects presence of gas flow in the gas feed pipe 3 and outputs to the monitoring part 13. When gas leakage is generated even at using no gas, the flow sensor 12 outputs a signal of presence of gas flow to the monitoring part 13. Assuming that gas is not continuously consumed for 720 hours ordinarily, and when the detected result of presence of gas leakage continues for 720 hours, the monitoring part 13 discriminates presence of gas leakage, and displays the presence of gas leakage on a display part.
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