Discuss fitting a pir near roadside in the UK Electrical Forum area at ElectriciansForums.net
got a job fitting a pir near side of road (4 metres away) to contol 2 led floods any tips to avoid cars or pushbikes setting it off ,i can point it down and buy one with sensitivity control but any other tips please
PIR motion detectors detect the movement of heat...….hence they are motion detectors. In other words, detecting both. Stand perfectly still and no operation.PIRs detect heat not motion. At least that's the case with alarm systems that I've worked on. You should be able to adjust the range to its minimum and point them down. Just need to work it out.
PIR motion detectors detect the movement of heat...….hence they are motion detectors. In other words, detecting both. Stand perfectly still and no operation.
What's all that got to do with it?Yes. That's true. If the heat source happens to be moving. But the fact that the heat source might be moving is irrelevant. If the moving object is at ambient temperature then a basic PIR won't detect it. They are heat sensors. For example, if someone throws a rock through a window a standard PIR won't detect it. That's why Honeywell, for example, provide Dual Tec sensors. They use both passive infra red, to detect heat sources, and microwave technology to detect moving objects that don't have a heat fingerprint.
I know it's off topic but just clarifying my first comment which you challenged. Here is a picture of a brick. It was thrown through a window. The PIR is just above my head when I took this picture. It did not trigger and it was functional. I tested it afterwards. I replaced all PIRs with Dual Tec.What's all that got to do with it?
A PIR motion sensor takes a moving heat source to operate.
It would've triggered if they'd jumped through the window after smashing it, though.....
No doubt, it was.Perhaps it was just criminal damage.
It would've triggered if they'd jumped through the window after smashing it, though.....
You're welcome.Thanks. I'm happy now
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