| 摘要 |
A fire and smoke alarm device which is activated by the presence of smoke and/or excessive heat. The device includes a housing having an air sampling chamber and means therein to induce the flow of air therethrough. A fire sensing means is provided in the air sampling chamber which will activate an alarm circuit when the temperature in the chamber reaches a predetermined level. A sealed and insulated temperature controlled compartment is also provided in the housing and has a photoelectric cell therein which will activate an alarm circuit upon the cell sensing a predetermined light intensity in the air sampling chamber. The air sampling chamber has a light source mounted therein which illuminates a portion of the chamber. A clear lens is positioned between the air sampling chamber and the compartment for admitting light into the compartment so that the photoelectric cell can sense the light intensity in the air sampling chamber. Means is provided for maintaining the temperature in the compartment at 120 DEG F. so that the photoelectric cell will function with the required sensitivity.
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