| 摘要 |
PROBLEM TO BE SOLVED: To realize a gas pressure detecting device of high reliability by closing a pressure detecting passage, constituted out of heat resisting material at rising of ambient temperature due to a fire or the like, and preventing gas from leaking. SOLUTION: A cushioning pedestal 2 joined with the underside of a pressure sensor element 1 is held, through an adhesive 5, with a pressure introducing tube 3 with a built-in temperature fuse circuit 11 for the purpose of closing the passage at an abnormal high temperature due to a fire or the like, and a pressure detecting circuit is airtightly surrounded with the circumference. Electrically, the pressure sensor element 1, a wire 7, a lead frame 4, and a circuit board 6 are connected together, and the circuit board 6 is formed with an electrical circuit such as an amplifier circuit. A lower case 9 is constituted so that it is integratedly formed with the pressure introducing tube 3 and the lead frame 4, the circuit board 6 is stored therein, and it is stored in an upper case 10 provided with a fixing part to a mounting part 12. Hereby, before the respective parts material are deteriorated by high temperature, the temperature fuse circuit 11 is operated, the pressure-detecting passage is closed, and gas is prevented from leaking.
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