No PIR's working

[skool]

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, but shows that some must still be working.

 

[sparkymarka]

Doesn’t sound right to me ....ok some detectors do suffer from sunlight affecting the lens ....push your finger on the lens if it starts cracking ( brittle ) that’s your problem if it’s still flexible then it’s not that

 

[skool]

can we remove the lens altogether?

 

[sparkymarka]

No

 

[skool]

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