Passive infrared detectors are a type of detectors that are very commonly used in security engineering. But for its normal use, it is necessary to prevent false negatives and reduce false positives, mainly to minimize false positives. To do this, we must first understand some basic concepts and technical characteristics of passive infrared detectors, so that according to these basic technical characteristics, from the installation, commissioning, use and other links, according to the basic technical characteristics of the detector, Only in this way can the maximum effect of the detector be maximized. Then first we must understand the following information, which will be of great help to the correct use of passive infrared detectors. 1. Determine the installation height according to the instruction 2. Not suitable for facing glass doors and windows 3. Should not face the hot and cold vents or cold and heat sources 4. Should not face large objects that are easy to swing 5. Reasonable location 6. Reasonable selection After installing the detector, commissioning the detector is the last thing to do. The debugging of passive infrared detectors is generally a walk test, that is, the debugger walks the S-shaped line in the warning area to perceive the length and width of the warning range to test whether the entire alarm system meets the requirements. You can refer to the instruction manual to adjust the sensitivity of the detector appropriately. Too high or too low sensitivity will affect the prevention effect.
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The installation height of the detector is not arbitrary, it will directly affect the sensitivity of the detector and the effect of preventing small animals. The installation height of the general wall-mounted infrared detector is 2.0-2.2 meters.
There are two problems facing glass doors and windows: One is white light interference. Although the passive infrared detector (PIR) has a strong suppression function for white light, it is not 100% suppression after all. Do not face the glass doors and windows to avoid strong light. The second is to avoid complex environmental interference outside the doors and windows, such as direct sunlight, crowds, mobile vehicles, etc.
The induction effect of passive infrared detectors is closely related to temperature changes. Both cold and hot vents and cold and heat sources may cause false alarms. For some low-performance detectors, sometimes the air convection through the doors and windows will also be Cause false positives.
Large swings of large objects can instantly cause sudden airflow changes in the detection area and may also cause false alarms; for example, outdoor detectors should avoid large trees and tall shrubs.
There should be no screens, furniture, large bonsai or other partitions in the detection range; it is best not to install two wireless infrared detectors in the same space to avoid interference caused by simultaneous triggering; infrared detectors should be The walking line in the room is at a certain angle. The detector is least sensitive to radial movement, but most sensitive to tangential movement (ie, perpendicular to the radius). Choosing a suitable installation location on site is an extremely important part of avoiding false alarms of infrared detectors and obtaining the best detection sensitivity.
There are many types of passive infrared detectors, from indoor to outdoor, from wired to wireless, from single infrared to three infrared, from wall-mounted to ceiling-mounted, then the detector to be installed must consider the size of the guard space , The surrounding environment, the characteristics of the entrance and other actual conditions. 
How to properly install and use passive infrared detectors