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? Link to comment https://www.thesecurityinstaller.co.uk/community/topic/46211-hkc/page/4/#findComment-521037 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" Nothing is foolproof to a sufficiently talented fool. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/46211-hkc/page/4/#findComment-521038 Share on other sites More sharing options...
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