PIR question

[RoyC]

Optima XM6

Over the years we have had the alarm go off when we were out, for no apparent reason.

Question :- Could a PIR be activated by traffic images through a large mirror? Or by a spider?

 

[caretech]

Images through a mirror - No

Spider - Yes if it can get inside the pir. Make sure the cable entry hole has some mastic etc over gaps where cable enters the Pir.

How old is the Pir ? newer pirs now have a "pulse count" which basically reduces the sensitivity.

 

[RoyC]

How old is the Pir ? newer pirs now have a "pulse count" which basically reduces the sensitivity.[/quote]

System was fitted in 1993. PIR's are Racal Apollo C

 

[RoyC]

Spider - Yes if it can get inside the pir. Make sure the cable entry hole has some mastic etc over gaps where cable enters the Pir.


It has to get inside the PIR?
Are you saying, that a spider running across the front of the PIR won't activate it?

 

[caretech]

Racal Apollo was a good pir. A spider going over the lens unless a b(**dy big one !! would not normally activate it. Make sure the standby battery in the control unit is good, It should normally be replaced every 4 to 5 years. Check all cable connections to pir and in the control unit. If you have more than 1 pir try swapping them over if the fault follows the pir then you have a suspect pir (replace it)

 

[RoyC]

Make sure the standby battery in the control unit is good, It should normally be replaced every 4 to 5 years.

Control battery replaced 3 days ago, New bellbox fitted yesterday because I couldn't find a replacement battery for my flashguard bellbox.

All is OK at the moment.

 

[caretech]

All is OK at the moment.

Hope it stays that way.