Motion detecting sensors are an important component of security systems. Detecting a movement provides an early warning for the system owner. Also alarm tiggering functon can prevent illegal entries.
How Do REX MW and PIR Sensors Work?
Motion detecting sensors are an important component of security systems. Detecting a movement provides an early warning for the system owner. Also alarm tiggering functon can prevent illegal entries. Here are the most common motion detectors and their differences below.
The Most Common Motion Detectors and Their Differences
REX – Request-To-Exit Switch
This device is made only to tell whether the door is open or not. It has no smart functions, special waves or what so ever. It can’t tell the difference between legitimate entry or forced entry.It is usually used with magnetic card readers which neutralize the REX switch and allow a safe passage.
MW- Micro Wave Motion Sensor
MW sensors send out microwave signals to detect any movement in that area. They cover more places than PIR sensors but there is a possibility of infecting from electromagnetic fields created by devices inside the house.
PIR – Passive InfraRed Motion Sensors
This sensors are designed to detect heat and movement in the surrounding areas. When the sensors heat up, they radiate infrared waves. If a movement or heat change blocks these waves then the sensors trigger an alarm or lights or whatever connected to it.
Pet Immune PIR Sensors
Pet Immune PIR sensors ignore the moving objects smaller than 80 pounds. If the heat signals of the animal cover a small area than a human body does, the sensors ignore that presence and do nothing.
Dual Technology Motion Sensors
The most common type of this sensors are the combination of PIR sensors and MicroWave sensors. This sensors are being used together to reduce a false alarm triggering.