| 摘要 |
Electrical circuitry associated with a pneumatic pressure detector for use in an overheat condition or fire alarm system for aircraft. The pressure detector comprises a plenum situated between a pair of deformable diaphragms and pressurized by a capillary type sensor containing an absorbed gas. A control electronics stage is located remotely from the pressure detector stage and is connected thereto by a single wire extending between them. The control electronics stage senses integrity failure of the pressure detector, an overheat or fire condition, and a ground fault in the connection between the two stages and provides corresponding output indications. The circuitry also includes ground connections at the control electronics stage and the pressure detector, respectively.
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