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You are here: Knowledge Base > Motion Detectors
How do motion detectors work?Last Updated: 11/20/2013 |
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By Petra Paulson
are the most common. They detect levels of infrared radiation (aka: heat energy) in a given area. Because humans radiate heat at 98.6 degrees Fahrenheit, the sensor is able to detect the heat difference from other objects in the room at an average room temperature of 70 degrees. When a motion detector recognizes this heat difference within its field of view, it sends a signal to the control panel and an alarm sounds. Today, many PIRs, like the 5800PIR-RES, allow users to adjust the sensitivity of the detector so an alarm won't be triggered when household pets walk within range of the detector. Microwave Motion Detectors... are considered active devices because they emit high-frequency radio waves and monitor disturbances in the frequency that are caused by people moving through their field of view. Microwave detectors are more prone to false alarms because the high-frequency signals easily pass through walls and can accidentally pick up motion in other locations. For this reason, many microwave detectors also work in tandem with PIR sensors, as with the 5898, to guard against false alarms. Similar Products: 5800PIR-COM Wireless PIR Motion Sensor |