FIRE DETECTOR FOR MONITORING A ROOM BY MEANS OF A COMBINATION OF SMOKE DENSITY MEASUREMENT AND TEMPERATURE MEASUREMENT
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Abstract
A fire detector monitors a room and triggers a fire alarm. The fire detector has a smoke sensor and a temperature sensor for measuring a smoke density and a temperature. When a temperature threshold value and/or a smoke density threshold value is exceeded an alarm is triggered. The temperature threshold value is dependent on the smoke density and/or the smoke density threshold value is dependent on the temperature. The fire detector contains a memory. A complicated evaluation as to whether the temperature or smoke density threshold value has been exceeded is avoided and the risk of false alarms is reduced due to a stored matrix. The matrix contains combination values, and one of the combination values is assigned to the measured temperature and the measured smoke density. The combination value indicates whether the temperature threshold value and/or the smoke density threshold value has been exceeded or fallen below.
15 Citations
31 Claims
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1-14. -14. (canceled)
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15. A fire detector for monitoring a room and for triggering a fire alarm, the fire detector comprising:
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a smoke sensor for measuring a smoke density; a temperature sensor for measuring a temperature; an alarm, wherein, if a temperature threshold value is exceeded and/or a smoke density threshold value is exceeded, said alarm is triggerable, the temperature threshold value being dependent on the smoke density and/or the smoke density threshold value is dependent on the temperature; and a memory storing a matrix, the matrix containing combination values, wherein one of the combination values can be allocated by means of the matrix to the temperature measured and to the smoke density measured, wherein a combination value indicates an exceeding or an under-stepping of the temperature threshold value and/or the smoke density threshold value. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification