发明名称 |
SCATTERED-LIGHT FIRE DETECTOR WITH A DEVICE FOR SUPPRESSING AN ACOUSTIC WARNING IN THE EVENT OF A LOW BATTERY VOLTAGE |
摘要 |
A fire detector has a detection unit working on the optical scattered-light principle, as well as an electronic evaluation unit. An acoustic and/or optical warning device outputs an acoustic and/or optical alarm when a fire is detected. The fire detector has an energy storage device, in particular a battery, for the autarkic supply of electrical power to the fire detector as well as a voltage measuring unit for measuring a battery voltage present at the energy storage device. A warning device outputs an acoustic warning if the battery voltage falls below a first voltage threshold. The fire detector also has a sensor sensitive to ambient light and a device for suppressing the output of the acoustic warning if the ambient light falls below a predefinable brightness threshold. The detection unit is an open scattered-light detection unit with a detection space outside the fire detector and the sensor sensitive to ambient light is at the same time an optical receiver of the scattered-light detection unit.
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申请公布号 |
US2012050051(A1) |
申请公布日期 |
2012.03.01 |
申请号 |
US201113218554 |
申请日期 |
2011.08.26 |
申请人 |
CLOSSEN-VON LANKEN SCHULZ MICHAEL;SIEMENS AKTIENGESELLSCHAFT |
发明人 |
CLOSSEN-VON LANKEN SCHULZ MICHAEL |
分类号 |
G08B17/10 |
主分类号 |
G08B17/10 |
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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