Method for detecting fires
First Claim
1. A method for detecting fires, comprising the steps of detecting a fire from an exceeding of an alarm threshold by at least one sensor signal;
- determining the alarm threshold as a function of signal parameters derived from the at least one sensor signal;
indicating a fire if the alarm threshold is exceeded for an alarm interval; and
determining the alarm interval as a function of the signal parameters.
1 Assignment
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Accused Products
Abstract
A method for detecting fires is proposed that serves to avoid false alarms, by providing that an alarm threshold is determined as a function of signal parameters derived from at least one sensor signal. False alarms are thus advantageously precluded. This is still further improved by setting up an alarm interval for which the alarm threshold must be exceeded, if an alarm is to be indicated. The alarm interval can also be determined adaptively as a function of the signal parameters. An upper threshold and a lower threshold are provided for the alarm interval and the alarm threshold, respectively, in order to build in a certain safety, so that the alarm threshold and alarm interval will not assume values that put a function of the fire detector at risk. It is also possible to use more sensor signals, in which case signal parameters can be generated by linking the sensor signals. As the fire detector, a scattered light smoke detector is preferably used, which is equipped with a labyrinth and a measurement chamber.
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Citations
13 Claims
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1. A method for detecting fires, comprising the steps of detecting a fire from an exceeding of an alarm threshold by at least one sensor signal;
- determining the alarm threshold as a function of signal parameters derived from the at least one sensor signal;
indicating a fire if the alarm threshold is exceeded for an alarm interval; and
determining the alarm interval as a function of the signal parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- determining the alarm threshold as a function of signal parameters derived from the at least one sensor signal;
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8. A device for detecting fires, comprising at least one sensor for generating at least one sensor signal;
- and means for determining the alarm threshold as a function of signal parameters derived from the at least one signal, indicating a fire if the alarm threshold is exceeded for an alarm interval, and determining the alarm interval as a function of the signal parameters.
- View Dependent Claims (9, 10, 11, 12, 13)
Specification