Sensors such as pullcords, pendants, motion detectors known as PIR’s, reed switches, glass-break detectors, smoke detectors and infra-red beams - these devices have Sensor Tamper modules fitted inside the equipment.
Alarm system sensors provide an output that changes state based on whether the sensor had been tripped or not, when connected in a circuit they perform like a switch that is activated automatically. A fitted Sensor Tamper allows an alarm panel to verify the integrity of the sensor.
Some possible causes of Sensor tampers may be:
1) If an intruder cuts the wire going to device.
2) One or both wires may have fragmented between the alarm panel and the sensor.
3) Physical interference, are you attempting to change a low battery?
4) Attempting to Reposition/Move or Relocate the Sensor.
If problems do persist, please contact a technician right away.