360-Degree Wired Motion Sensors
When choosing a new motion detecting sensor for your alarm system, you might consider a 360-degree motion sensor. These motion sensors use the same passive infrared (PIR) technology that standard motion sensors normally use. However, the detection pattern for these motion sensors differs so that it can more easily detect movement straight down below. This makes these sensors perfect for mounting on the ceiling, especially outside of doorways. If someone comes into the room or leaves the room, the motion sensor will pick up their movement. For certain applications, this is advantageous and preferable over the detection pattern offered from standard motion detecting sensors. Some users may refer to these devices as "ceiling-mounted" motion sensors.
Like all other PIR motion sensors, the 360-degree motion sensors use a similar method of action. These devices look for the changes in infrared (IR) energy that occur with movement. If a person or large object comes within the sensor's field of view (FoV), then the device will activate and alert the security system. The system will then respond based on the set Response Type for the zone. This could include triggering an alarm and alerting the authorities.
You need to take mounting height into careful consideration when using a 360-degree motion sensor. These devices work best when mounted for a height of 8 to 12 feet high. The higher the motion sensor is installed, the further the detection pattern will spread out, thereby giving the device a larger FoV. However, mounting the sensor too high will make it difficult to detect the movement that occurs below. You should check the manual for your 360-degree motion sensor to determine the optimal mounting height.
Some users may also prefer to mount 360-degree motion sensors outside of windows. The same principle applies when mounting the sensor outside of a doorway. If an intruder enters in through the window, then the motion sensor will be there to capture their movement as soon as they enter. This is perfect for users who may have had problems with shock sensors or glass break sensors causing false alarms for whatever reason. Just make sure that the detection area is large enough to capture the movement regardless of where the intruder enters.
The motion sensors listed here are all hardwired sensors. You will need to connect the sensor directly to a hardwired panel or to a compatible wired to wireless converter for your system. Typically, only users with hardwired alarm panels will use hardwired motion sensors. If you have a wireless alarm system, then you might consider getting a wireless 360-degree motion sensor instead. The wireless devices basically have the same operation, but they are much easier for DIY users to install.