A method and apparatus are provided for identifying product tampering. A mechanical fastening screw, a sleeve and a movable follower disk are arranged to show evidence of tampering. The movable follower disk is received within a cavity defined by the sleeve. The sleeve includes a channel and a final resting slot defined within a sleeve wall. The movable follower disk includes compressible spring followers slideably received within the channel when the mechanical fastening screw is inserted. If the screw is removed, the compressible spring followers engage the final resting slot to indicate tampering. Electrical detection of the compressible spring followers engaging the final resting slot is used to identify tampering.

A tamper switch body is disposed in a housing of a PIR sensor. A tamper opening is formed at a position opposite a switch actuating member of the tamper switch body in a base plate of the PIR sensor. An elastic switch member is mounted in the tamper opening. The elastic switch member includes a pressure-receiving projection portion abutting a mounting plate, and depresses the switch actuating member through elastic deformation of the pressure-receiving projection portion by receiving a pushing force from the mounting plate in a state in which the PIR sensor is fixed to a wall surface. The elastic switch member seals the inside of the housing by closing the tamper opening, thus preventing a flood into the housing of the PIR sensor.

Sensors and methods for detecting attachment to a surface are disclosed. The sensors include a housing having an inner surface, an outer surface and a passage extending through the housing. An elongated member or fastener extends through the passage and protrudes from the outer surface of the housing to attach the sensor to a surface. First and second electrical contacts are disposed within the housing so that when the sensor is attached to the surface an electrical path is formed between the first and second electrical contacts.

A security arrangement includes a mounting device having an upstanding wall. The mounting device is mounted to a surface of a structure such that the wall is oriented substantially perpendicular to the surface. A security sensor senses an event that occurs outside of the security arrangement. A tamper detector is attached to the security sensor and includes an optical emitter, an optical receiver, and a slot disposed between the emitter and the receiver. The emitter transmits optical energy that is received by the receiver through the slot. The wall of the mounting device is received in the slot when the tamper detector is coupled to the mounting device to thereby block the transmission of the optical energy from the emitter to the receiver. A controller is communicatively coupled to the receiver and produces a tamper signal in response to the receiver receiving the optical energy.

A tamper detection mechanism in a sensor device comprising a body and a mounting base. The sensor device includes a substantially central resilient element/plunger attached to the mounting base. The body houses a printed circuit board includes a surface for mating to the resilient element to create a circuit. The mounting base may be removably affixed to a structure such as a wall or ceiling. When the mounting base is screwed into the structure and the body is coupled to the mounting base, the plunger is compressed and exerts a continuous pressure on the printed circuit board surface to complete the tamper circuit. If the sensor device is uncoupled and/or removed from the structure, the circuit is opened and a tamper indication signal is produced.