Module tamper detection circuitry

Details Module tamper detection circuitry Module tamper detection circuitry

1997-08-15

1999-02-02

Swann, Glen

Communications: electrical

Condition responsive indicating system

With particular system function

340529, 340568, 340628, G08B 2100

Patent

active

058670955

ABSTRACT:
A detector tamper/trouble delay circuit incorporates a sensor which senses the presence or absence of a cover for the detector. When the cover is removed, the sensor triggers a delay element preset for predetermined time interval. If the cover is replaced during the time interval, no trouble or fault indicator is generated. If the cover remains off the detector for the entire time interval, a trouble or fault indicator will be generated. The indicator can be used by an alarm system control element or a stand alone trouble or fault indicator for producing a humanly perceptible representation of the existence of the fault or trouble condition.

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patent: 4394655 (1983-07-01), Wynne et al.
patent: 4528558 (1985-07-01), Steers et al.
patent: 4916432 (1990-04-01), Tice et al.
patent: 4920333 (1990-04-01), Barr et al.
patent: 5568123 (1996-10-01), Derheim
patent: 5598147 (1997-01-01), Mochizuki et al.

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