At the time there was no logic I could understand, the PIR's installed at correct heights no masking, plenty of additional detection to the rear perimeter. The front of the building is a resturant and bar area so coverage by 3 pirs (not crossing each other) is enough also as it's on a high street vibration on the windows was not an option.
I can only think looking at the images the guy was totally covered up limiting the amount of IR and as the beams were set on medium sensitivity I think was the issue. When the Police arrived (called by a neighbour) everything worked as it should as they went through the door as it was not unlocked.
HKC is very good Ihave hundreds out there, but I think for me it's an eye opener as to not get too complacement with the installation and tweek the system to be more sensitive.
For information the grading for Police was mainly for the PA and the intruder was not a priority, risk assesment and specification approved by insurers and logs of testing to monitoring station all ok.
At the time there was no logic I could understand, the PIR's installed at correct heights no masking, plenty of additional detection to the rear perimeter. The front of the building is a resturant and bar area so coverage by 3 pirs (not crossing each other) is enough also as it's on a high street vibration on the windows was not an option.
I can only think looking at the images the guy was totally covered up limiting the amount of IR and as the beams were set on medium sensitivity I think was the issue. When the Police arrived (called by a neighbour) everything worked as it should as they went through the door as it was not unlocked.
HKC is very good Ihave hundreds out there, but I think for me it's an eye opener as to not get too complacement with the installation and tweek the system to be more sensitive.
For information the grading for Police was mainly for the PA and the intruder was not a priority, risk assesment and specification approved by insurers and logs of testing to monitoring station all ok.