发明名称 |
Combustion products detector with accelerated test |
摘要 |
A battery-powered photoelectric smoke detector periodically samples the air in a smoke chamber. A manually-operated test button is provided for simulating smoke to test the device. The sampling frequency is determined by a first resistance. A frequency changing circuit includes a test switch, the movable contact of which is coupled to the test button and is responsive to operation thereof for connecting it parallel with the first resistance the series combination of a diode and a second resistance for increasing the sampling frequency. Means are provided for back-biasing the diode to disable the frequency changing circuit when the detector detects smoke.
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申请公布号 |
US4539556(A) |
申请公布日期 |
1985.09.03 |
申请号 |
US19830485234 |
申请日期 |
1983.04.15 |
申请人 |
PITTWAY CORPORATION |
发明人 |
DEDERICH, STANLEY S.;SCHOENFELDER, GEORGE A.;KOSTER, WILLIAM M. |
分类号 |
G08B17/107;G08B29/14;(IPC1-7):G08B29/00;G08B17/10 |
主分类号 |
G08B17/107 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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