| 摘要 |
An ionization smoke sensor wherein the electric circuit of the sensor is surrounded by a first metallic case; an ionization chamber into which smoke from the exterior enters is constructed of a radiation source, an intermediate electrode and an outer electrode; the outer electrode is formed of a second metallic case; and the first and second metallic cases are electrically connected through a member of conductive elastomer, so that electric elements of the electric circuit are protected from external electrostatic charges.
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