How do burglar alarm sensors work?

Passive infrared detection technology used in security systems has evolved over time, with leading manufacturers always coming up with new and novel methods to detect intruders and minimise false alarms.

The PIR sensor technology, which is used in many burglar alarm systems in both residential and commercial locations, is one of the most effective to date.

What is a PIR (Passive Infrared) Sensor?

PIR (passive infrared) sensors detect infrared emitted by anything that produces heat. Although this form of emission is not visible to the naked eye, it may be detected by sensors that operate at infrared wavelengths. They’re also known as’ motion-based detectors,’since they detect the presence of humans, animals, and objects by moving their infrared wavelengths.

The term “passive” refers to the fact that the sensor itself does not release any heat or energy. It’s also worth noting that PIR sensors measure the emission of infrared radiation rather than heat.

PIR Sensors: How Do They Work?

A relay is part of a circuit that runs across twin contacts in the case of PIR sensors in burglar alarms. When the PIR sensor senses movement, it activates the relay, which breaks the circuit and sets off the alarm.

PIR sensors work on the principle of positive differential change. The detection range is determined by the field of view of two IR-sensitive slots in front of the lens. Both slots have the same ambient amount of infrared sensed in the room (naturally produced by all items) when ‘idle.’ When an item, person, or animal goes through the detecting region, one of the slots detects it first, creating a positive difference as it passes through and a negative differential as it exits.

The PIR sensor utilises these differentials to detect movement and, if active, sends a message to the alarm panel and sounders. It’s critical to encase the PIR sensor in a material that can decrease ambient temperature and humidity effects, such as metals or silicon.

Pet tolerant alarm sensors

Alarms using PIR sensors may be programmed to disregard particular forms of moving objects or only detect motion over a specified height. This makes them ideal for pet-friendly families, since you can set the alarm before leaving the house throughout the day without fear of it being activated by your cat or dog wandering about.

For smart house alarms that combine cutting-edge technology combined with easy control by smartphone, fob or keypad look no further than a Pyronix security system supplied & installed by Ultimate Alarms. Contact us today for installation in Glasgow, Paisley and throughout central Scotland.

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