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WebInsects and small animals set off PIR motion detectors because they emit the infrared (IR) energy needed to activate the devices. If an insect or small animal gets close enough to the sensor, then they will be able to activate it. Some motions have bug guards to prevent this from happening. PIR motion sensors work by looking for the changes in ... WebHow to prevent spiders triggering your burglar alarm. Setting your alarm off is a bit of an inconvenience and the spiders aren’t harmful but it can be annoying for neighbours … WebJan 18, 2012 · 9. There are all kinds of reasons fire/smoke alarms will go off when you're cooking. Sometimes, it's just flat-out smoke. Other times, atomized fats or even steam will be detected as smoke. Some detectors will also detect heat, and it's really easy to generate excess heat near the ceiling when cooking. black blue eyed baby