| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas detector hard to exert the adverse effect of the constituent material of a pump chamber on a gas detection chamber by simple constitution. SOLUTION: The gas detector is equipped with the gas detection chamber 2 having a gas detection element 1 mounted therein and a diaphragm pump 3 equipped with the pump chamber 32. A gas flow passage 4 for guiding gas to be detected to the gas detection chamber 2 from the outside is formed and a gas flow passage 4 for discharging the gas to be detected to the outside from the gas detection chamber 2 is provided. One of the gas flow passages is connected to a valve disc housing part 33 on an inflow side and the other one of them is connected to a valve disc housing part 34 on a discharge side. The valve disc housing part 33 on the inflow side has a sheetlike valve disc and a helical spring mounted therein to be formed into a cylindrical shape and the helical spring comes into contact with the entire periphery corresponding to the part coming into contact with an opening edge part and the intermediate part with the edge part of the valve disc on the plan view of the valve disc to press the same.
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