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what material is it made from? Come to think of it, a lot of our dts are in internal corridors with only artificial lighting

can we remove the lens altogether?

He reckoned that all of our detectors have the same fault and we will need to replace the whole system. He is now working on a quote for a new alarm system for our large school. Oddly enough I had to respond to an alarm event last weekend where a dt activated in one of our stores - false alarm...

The engineer broke the cover when trying to replace it and took it away to try and get a replacement

Don't think so - but was probably in engineer mode at the time

Pics

The PIR's are powered ok. Someone told me it may be the plastic screen lid that has deteriorated and affects the detection capability - does this make sense?

All the zones are still appearing on the keypad and we have been setting it the same way this 20 years

I am in a school with an old Galaxy 500 (V4.5). Looks to be working grand with door contacts but it seems that none of the dual tecs PIR are detecting movement - and we have dozens of them. I can set the alarm and then walk around the school and the alarm does not trigger until I open an...