Fire detecting system
First Claim
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1. A fire detector for protecting premises periodically occupied by workers and operating machinery, said fire detector comprising:
- at least one first sensor for emitting a first output signal in response to a fire phenomenon,at least one second sensor for detecting a source of false alarm conditions, said false alarm conditions being detected from the presence and activities of said workers and operating machinery andan evaluating circuit,said evaluating circuit comprisingmeans for providing an alarm signal in response to a value of said first output signal exceeding a threshold value andmeans for changing said threshold value relative to said first output signal value in response to a second output signal from said second sensor.
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Abstract
A fire detector having a first sensor for emitting a first output signal in response to a fire phenomenon, a second sensor for detecting a source of false alarm conditions generated by man and/or machinery and an evaluating circuit. The evaluating circuit has a mechanism for activating an alarm signal when the value of the output of the first sensor exceeds a threshold value. The threshold value is set by the second sensor in response to the detection of signals generated during normal use of the premises to be protected.
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Citations
11 Claims
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1. A fire detector for protecting premises periodically occupied by workers and operating machinery, said fire detector comprising:
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at least one first sensor for emitting a first output signal in response to a fire phenomenon, at least one second sensor for detecting a source of false alarm conditions, said false alarm conditions being detected from the presence and activities of said workers and operating machinery and an evaluating circuit, said evaluating circuit comprising means for providing an alarm signal in response to a value of said first output signal exceeding a threshold value and means for changing said threshold value relative to said first output signal value in response to a second output signal from said second sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification