Module tamper detection circuitry
First Claim
1. A tamper detection apparatus for use in an electrical module which has an access port closed by a removable element comprising:
- a supervisory sensor for detecting removal of the element;
a delay circuit, coupled to the sensor, for generating an output signal a predetermined time interval after removal of the element wherein the output signal is indicative of the element'"'"'s not being replaced on the module during the time interval.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
27 Claims
-
1. A tamper detection apparatus for use in an electrical module which has an access port closed by a removable element comprising:
-
a supervisory sensor for detecting removal of the element; a delay circuit, coupled to the sensor, for generating an output signal a predetermined time interval after removal of the element wherein the output signal is indicative of the element'"'"'s not being replaced on the module during the time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A supervised electrical module comprising:
-
a housing; an attachment removably affixed to the housing; attachment removal detection circuitry carried by the housing for generating an indication of a removal of the attachment; circuitry, coupled to the detection circuitry, for initiating a timing interval in response to the generated indication; and circuitry for generating a supervisory signal indicative of the attachment'"'"'s having been removed if the attachment is not replaced before the expiration of the timing interval. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification