How to avoid false alarms and missed alarms of pyroelectric infrared sensors?
Pyroelectric infrared sensors play an important role in today’s security alarm systems. They are widely used in insurance devices, burglar alarms, induction doors, automatic lamps, smart toys, etc. However, errors often occur during use. In the case of alarm or missed alarm, the following editor gathers relevant materials in this area for your reference.
1. Do not place heat generating objects within the detection range, such as heaters, water heaters, televisions, computers, refrigerators and other electrical appliances, unless these electrical appliances are turned off. Heating, water heaters, computers, and refrigerators will turn on and off in the automatic program control state, which will cause false alarms.
2. Avoid strong light interference within the detection range, such as sunlight, car lights, spotlights and lighting. The rich infrared spectrum of these light sources can cause false alarms.
3. Avoid objects that are moved by wind, such as curtains, clothing, flowers, etc., within the detection range. Before arming, close windows and doors to avoid air convection causing objects to scoop and cause false alarms. Because the floating object cut the infrared rays, the detector misjudged.
4. Avoid animal interference within the detection range, and adjust the height of the lower depth detection area so that animals below 0.5 meters are not in the detection area. If the family has pets, the multi-zone detector can be replaced with a horizontal detector. A simpler method is to use an opaque tape to paste on the lower end of the lens.
5. False alarm detector is found, find out the reason and eliminate it. Usually within the range of the anti-theft detection, the detection sensitivity can be fine-tuned to moderately reduce the detection distance.
6. Choose a detector that has passed the inspection of the Ministry of Public Security and has good cost performance.
2. Avoid missing alarms
1. Do not obstruct the detection range by obstacles, leaving a detection gap is not enough to cause an alarm.
2. The installation position of the detector should not cause the detection range to create a blind spot, which can give thieves an opportunity.
3. The detector should be installed close to the protected objects, such as safes, confidential information cabinets and other valuable objects.
4. There must be a margin in the detection range. In summer, when the ambient temperature rises in line with the surface temperature of the human body (30～32℃), the detection distance will be shortened by more than 1/3, and even some detectors may not detect. Therefore, attention must be paid.
5. Maintain a test within 10 days to ensure normal operation. Pay attention to cleaning the Feiwener lens. The stains and mildew spots on the surface of the front and back concentric circles will affect the detection distance and effect.
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