| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost and highly reliable gas leakage detecting system saving a space by a simple structure. SOLUTION: A gas pipe 3A is formed into a double tube, N2 gas or inert gas is sealed in its outer pipe 10 by a pressure higher than a gas pressure in an inner pipe 11, a pressure switch 12 for detecting the pressure of the N2 gas is provided, and an alarm is issued, when the pressure of the N2 gas lowers to a prescribed value or less.
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