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1, the temperature compensation circuit 2, the use of dual infrared light sensor, and the use of "pulse counting" mode of work 3, anti-radio frequency interference measures 4, anti-white light interference measures 5, anti-small animals false positives taken measures <br> <br> passive infrared detector (PIR) installation points:
1. Passive infrared detectors are space-controlled detectors. It does not radiate any energy to the outside world itself. Its power consumption is small, and ordinary batteries can maintain long-term work.
2. Due to the poor penetration of infrared rays, there should be no obstructions in the monitoring area, otherwise it will cause a "blind area" to be detected.
3. In order to prevent false alarms, the passive infrared detector probe should not be aimed at any object whose temperature will change rapidly, especially the heating element.
4, in the choice of installation location, the detector should have the maximum range of alert, so that all possible intruders can be in the alert range, so that all possible intruders can be in the infrared alert beam range. The activity of the intruder is conducive to laterally crossing the beam zone, which can increase the detection sensitivity.
5. The product types include wall-mounted and ceiling-mounted passive infrared detectors.
6. Since the passive infrared detector works in a passive manner, several installations in the same room will not generate interference.
Passive infrared detector (PIR) false alarm and installation points
Several technical measures to prevent false positives from passive infrared detectors (PIRs) :