False alarm reduction method and system
First Claim
1. A false alarm reduction method for a security alarm system comprising a control panel having a predetermined tolerance window of impedance change and one or more zone detectors installed at one or more monitoring zones and electrically connected to said control panel in such a manner that when one of said zone detectors detects a triggered signal, a loop impedance of said zone detector and said control panel changes from a restore state impedance to an alarm state impedance which is different to said restore state impedance for a predetermined value, wherein said false alarm reduction method comprises the steps of:
- (a) generating and injecting an altered impedance which is within said predetermined tolerance window of said control panel to present a desired state to said control panel; and
(b) monitoring any change of said loop impedance between said restore state impedance and said alarm state impedance for each of said zone detectors with respect to said control panel.
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Abstract
A digital verification control, which is incorporated with an alarm system, includes a first timer device for presetting a single zone verification time in the control panel and second timer device for presetting a multiple zone verification time in the control panel. The single zone verification time is a single detector time delay and arranged when one of the sensors detects at least two triggered signals in the respective detecting area within the single zone verification time, the local warning system is activated for producing a local warning signal. The multiple zone verification time, which is longer than the single zone verification time, is a multiple detector time delay and arranged when the two sensors detect two triggered signals in the detecting areas respectively within the multiple zone verification time, the local warning system is activated for producing the local warning signal.
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Citations
22 Claims
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1. A false alarm reduction method for a security alarm system comprising a control panel having a predetermined tolerance window of impedance change and one or more zone detectors installed at one or more monitoring zones and electrically connected to said control panel in such a manner that when one of said zone detectors detects a triggered signal, a loop impedance of said zone detector and said control panel changes from a restore state impedance to an alarm state impedance which is different to said restore state impedance for a predetermined value, wherein said false alarm reduction method comprises the steps of:
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(a) generating and injecting an altered impedance which is within said predetermined tolerance window of said control panel to present a desired state to said control panel; and
(b) monitoring any change of said loop impedance between said restore state impedance and said alarm state impedance for each of said zone detectors with respect to said control panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A false alarm reduction system for a security alarm system having a control panel and one or more zone detectors which are installed at different monitoring zones and electrically connected with said control panel, wherein said false alarm reduction system comprises:
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means for determining whether each of said zone detectors is in a restore state or an alarm state, and means for simultaneously and independently asserting either a desired alarm state or a desired restore state to said control panel. - View Dependent Claims (19, 20, 21, 22)
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Specification