Passive Infrared Motion Detecting Sensors
Passive infrared motion sensors are the best selling motion sensors that we offer. They are highly effective, and they can typically be programmed based upon the needs of the end user. Once the device has been activated by the presence of motion, it will send a signal to the security system, and a predetermined action will be performed. For example, you may have your security panel produce a siren to scare off intruders, or you might have a silent alarm to send for immediate police dispatch. Motion sensors can also be used as part of a home automation setup in order to automatically turn on the lights or activate a Z-Wave thermostat.
Passive infrared (PIR) technology is one of the best methods for detecting motion. This technology works by looking out for any significant changes in infrared energy. When a person steps into the detection area of a PIR motion sensor, the device will sense the change in infrared energy, and the zone associated with the sensor will be faulted. From there, the programmed response on the security system will occur. These devices will work in almost any type of environment, with some PIR sensors being specifically designed for outdoor use.
It is important to remember that a passive infrared motion sensor can also be activated by inanimate objects that cause a change in infrared energy. This can include things like a moving ceiling fan or an air vent that is blowing hot or cold air. For those reasons, the mounting location and sensitivity setting is very important for a PIR sensor. Many PIR sensors also have a pet immunity setting that is designed to prevent pets and other small animals from causing false alarms. If you have any pets in your home, we strongly recommend using a PIR with pet immunity in order to save yourself a great deal of hassle later.
The sensitivity setting for a PIR motion detector is generally changed by adjusting the pulse count for the device. A higher pulse count will make the device less sensitive to motion and prevent false alarms from occurring. This is often necessary for using the pet-immunity capability function and for preventing little things like insects or moving curtains from activating the sensor. On the other hand, a lower pulse count will increase the sensitivity of the device and make it easier to activate. This is great for areas where absolutely no motion should be present, such as secure building or a highly restricted area.
Another important factor to consider is the range of a PIR motion sensor. Different motion sensors offer different ranges, so you will want to choose a sensor that is appropriate for your type of application. It may be possible adjust the range of the sensor by changing its mounting location or its lens. For example, a long range lens is generally more useful for detecting motion across a long, narrow area. A user can also cover up a portion of the lens in order to restrict its detection area to a particular area.