Passive infrared detectors are a weak signal detection equipment, the installation must pay attention to some details, such as height, sensitivity. Properly install a passive infrared detector, you must master the following aspects: First, the performance characteristics of the detector must understand, and secondly to reasonably determine the location of the installation, and finally must be carefully tuned. Not the said detector alarm on the instructions to install, how to determine a passive infrared detector installation location?

       Normal installation angle is determined according to the instructions

       Mounting height is not random, it will affect the sensitivity of the detector and the effect of anti-small pets. Imagine, a detector is mounted on the 2M height position and the height position, then the moving object from the ground when moving, cutting the bright areas and dark areas of the frequency is not the same.

       Should not be the face of the glass doors and windows

       Passive infrared detector is on the glass doors and windows, there are two problems: First, the white light interference, apparently PIR White has a strong inhibitory function, but, after all, is not 100% inhibition. Therefore avoid facing the glass doors and windows, to avoid glare interference. The second is to avoid complex environmental disturbance outside the doors and windows, such as the flow of the crowd, the vehicle.

       Not being on the hot and cold air vents or cold and heat source

       The induction effect of the passive infrared detector has a close relationship with the change in temperature. Cold and hot vents and cold and heat sources are likely to cause the detector false positives, some low performance of the detectors, and sometimes through the doors and windows of air convection can also cause false positives.

       Not being on the easy to swing the object

       The easy swinging objects will microwave detector works, so the same may cause false positives. Ancient attention to the illegal invasion route to install detectors enough to prevent the illegal invasion of criminals, must be considered before determining the location of the installation, the buildings mainly out of the population. We actually prevent the entrance truncated illegal invasion line, also reached our goal.

       A reasonable selection

       Passive infrared detector has a variety of models. From 6 meters to 60 meters, from a single-the infrared to three technology, from wall-mounted to the ceiling there, you want women detector must consider prevention space the size of the surrounding environment, import and export features, such as the actual situation. Sometimes want to consider replacing the Fresnel lens to meet the requirements.

       Debugging

       Detector installing the in debugging detectors is the last to do work. Passive infrared detectors debugging has two methods, one step measurement is the commissioning personnel take the s-line in the warning area to perceive the length of the warning area liberalization, it can be understood from the figure.

       The microwave sensitivity and the infrared sensitivity were adjusted by step measurement method, too high or too low sensitivity will affect the preventive effect. Sometimes, because of the change of seasons, winter and summer of sensitivity were adjusted. Microwave sensitivity must not be too large, because the the microwave only penetrating debugging time to pay attention to.

       The second method is the instrument measuring the voltage output interface of the background noise, some detectors, to test the voltage with a multimeter, when the detector is in the alert state, the size of the output voltage of the static background noise, said sources of interference The extent of this position to judge whether to install such detectors.

       Above part only of basic common for the use and installation of passive infrared detectors little analysis of the various aspects of the brand in the infrared processing with its unique approach, before we install must carefully read the instructions, the most important through the accumulation of actual work experience, the characteristics of the detectors will be able to more profound understanding, in order to better play the role of passive infrared detectors in security engineering.