Did you know that PIR detectors (Passive Infrared Detectors) do have a finite lifespan, and, in fact, can start to deteriorate after about 2 years.

Bryan Rudolph, SAIDSA Technical Chairman, explains this in his Technical Training book “The Art of Intruder Detection”:

Detecting Infrared:

To detect infrared we use a device called a pyroelectric sensor (PYRO) which is really a very sensitive temperature sensor and is the main component in a passive infrared detector.

A pyroelectric sensor may start degrading after about two years. This does not mean that the detector stops working, but the detector may slowly become either more sensitive as it gets older or less sensitive and may be prone to false alarms, intermittent activations or non-activations.

The downside of PIR detectors is that when the target temperature matches the background temperature, the target becomes invisible to the detector as there is no temperature difference to detect.’

With the rapid advances in motion detection technology, communication (RadioLink, TeleLink and GSM transmitters) and other hardware and software developments, it is advisable to evaluate your system every two years.

Some older systems might not detect a small child used to breech the premises, as their size makes it difficult to detect them. If there have been changes to your routine, building alterations, changes in the number of people on site and/or changes in your risk profile, we urge you to bring this to our attention.

Feel free to ask our repairs technicians to do regular checks on your system and advise you when components start to show signs of ageing. By having your system checked and maintained on a regular basis you can avoid the effects of sudden device failure.

Contact Atlas on 041 401 2222 for a Security Professional to visit you and reassess your risk.