al-yeti Posted December 28, 2023 Share Posted December 28, 2023 1 hour ago, Terry Hunter said: Site has been live for two years and it was set hence activating when the Police went it - my thoughts a mixture of the beams set as being default medium sensitivity and the intruder being fully covered. So you have beams not pirs? Quote Link to comment Share on other sites More sharing options...
norman Posted December 28, 2023 Share Posted December 28, 2023 1 hour ago, PeterJames said: Infra red radiation is anything that sends out heat - basically has a temperature above around five degrees Kelvin - gives off infrared radiation. Therefore passive infra detector is looking for heat changes, but it is also looking for motion. I knows, but you said: "Infra red is the detection method NOT what the detector is looking for, infra red detector detects heat or INFRA RED radiation" Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
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