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Doesn't anti-tamper only work for when you try to open up the unit or otherwise try to break it somehow? My scenario has an intruder approaching a hypothetical NV780 that doesn't have anti-masking from the front and (try to) mask the upper two sensors without setting off the alarm. My brain...

I was also thinking that. However chrisc mentioned above you cannot get within 1 metre of an NV780 without the alarm going off (I assume he means that also to be true if you approach it from the front, thus from "outside" its field of vision). The security firm who quoted me the Optex BX-80's...

The point in approaching the beam is to try to disable it. If I were to try that, I'd try masking the top pair of detectors (because both an upper and lower sensor would need to be triggered in order for an alarm to go off). If the beam didn't have anti-masking, and I could approach the beam...

Thank you! Given that the NV780's field of vision is only to its sides, I'm intrigued by how it is able to detect someone approaching from its front, albeit at close range? Is it perhaps that, from such a close range, the IR you emit is strong enough to trigger the sensor through the...

Thanks. Do you get false alarms? How often if so?

What did the grape say when the elephant stepped on him? Nothing. He just let out a little whine.

Hello everyone, I've been looking at getting outdoor beams (the PIR type) for intruder detection. I've narrowed down my options to basically these two: Optex BX-80 https://www.idsprotect.co.za/za/en/products/detectors/outdoor-detectors/optex-bx80-detectors/862-01-bx-80nc-optex-bx80-detector...