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METHOD AND ARRANGEMENT FOR INCREASING THE SENSITIVITY AND EMERGENCY SAFETY IN A DANGER, IN PARTICULAR FIRE DETECTING SYSTEM.
METHOD AND ARRANGEMENT FOR INCREASING THE SENSITIVITY AND EMERGENCY SAFETY IN A DANGER, IN PARTICULAR FIRE DETECTING SYSTEM.
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机译:在特殊火灾探测系统中增加危险中的灵敏度和紧急安全性的方法和装置。
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摘要
A method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system such as a fire alarm system which cyclically samples a plurality of alarm units in the system for obtaining a series of measured values from each alarm unit, the measured values being utilized to form a quiescent value which is stored in a quiescent value memory. With each sampling cycle a current comparison value is formed from the alarm measured value, the stored quiescent value, and a comparison value from a previous sampling cycle stored in a comparison value memory. The current comparison value is then written in the comparison value memory as the new comparison value. The current comparison value is compared with a rated limiting value, and if the comparison value is greater than or equal to the rated limiting value, a display unit is activated indicating an alarm. If the comparison value is less than the rated limiting value, a new quiescent value is formed from the measured value and the stored quiescent value and written into the quiescent value memory.
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