Intruder detection system with programmable countdown timer for

Details Intruder detection system with programmable countdown timer for Intruder detection system with programmable countdown timer for

1991-02-11

1992-01-21

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

With particular system function

340522, 340527, 340541, G08B 2900

Patent

active

050831062

ABSTRACT:
An intruder detection system includes a self-supervision feature which, on the basis of detecting authorized pedestrian traffic within a region under surveillance, alerts the system user of potentially faulty system components. Such system comprises a programmable timer which is repeatedly reset to a programmed maximum time interval by each occurence of an alarm-producing event, such as a disturbance of standing microwaves and/or a slight increase in ambient temperature in a region under surveillance. During "disarm" periods when the system alarm is intentionally deactivated to enable use of the protected region without the production of any alarm signals, each occurence of an alarm input to the system alarm (as produced by authorized traffic within the protected region) is used to repeatedly reset the timer to its preselected time interval (e.g., 1,4,8 or 16 days). In the absence of an alarm input within the programmed time interval, the timer times out and activates a "trouble" alarm, alterting the system user of a potential sensor failure. Preferably, the timer's countdown is halted or interrupted during periods when the system is "armed".

REFERENCES:
patent: 4622539 (1986-11-01), Buss et al.
patent: 4660024 (1987-04-01), McMaster

Affiliated with

Also associated with

Rating

Intruder detection system with programmable countdown timer for does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intruder detection system with programmable countdown timer for , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intruder detection system with programmable countdown timer for will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-117515