| 摘要 |
1492193 Ionization detectors ANGLO AMERICAN CORP OF SOUTH AFRICA Ltd 19 Aug 1975 [26 Aug 1974] 34390/75 Heading H1D In a fire detector having an ionization chamber 12 in which a grid electrode 14 is mounted from the housing 10 by an insulating support 16, a heat generating component 28 of the electronic circuitry associated with the detector is mounted within a cavity 26 formed in the support 16 to heat the surrounding part of the support 16 and thus prevent leakage currents between the electrode and housing due to the formation of moisture on the support 16. As shown, the component 28, e.g. an operational amplifier is mounted within a vertical limb 24 of support 16 to which is attached the grid 14. The remainder of the electronic circuitry is mounted in a box 20 in a cavity 22 in the support 16. |
