RE: Major panic last night

["Kevin Hawkins" <lists@xxxxxxx>]

It was just that you said two sensors had tripped, in different rooms (hall
& kitchen) - I was surprised that you would have a PIR that was active
in
the kitchen if the dog was in there although as you say maybe the kitchen
was disabled in away mode but showed in the log/report after the hall had
tripped. In which case your false alarm is a little more comforting in that
only one sensor was involved really. I think that's what you're saying too.

"Spiders in the sensor", is what my parent's alarm company always
used to
blame these on . in fact they installed one of those ultrasonic flood
transmitters that are supposed to cause all such insects to vacate but I
remain very sceptical. The problem did lessen though. Could be anything  -
in my hall I had an issue with the postman pushing his hands/letters
through
a very large letterbox that was in view of the sensor, took a while to
realise what the problem was. In the days of a 7.30am postal delivery
schedule it would have been more obvious but now it's anytime between 9am
and 2pm - usually with a variety of other peoples post included.  Progress
eh.



Kevin



-----Original Message-----
From: Paul [mailto:groups@xxxxxxx]
Sent: 27 June 2003 15:07
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Major panic last night



Both sensors are PIR's (good ones at that). The kitchen PIR is not enabled
in away mode as the dog lives there. Not sure if it would show up after
another sensor has triggered (probably would). Could be that the hall PIR
just went off as false alarm and the dog moved around as the keypads
started
announcing an entry alert. If so, the hall sensor was the only one to
trigger as a false alarm (if that makes sense).

Paul.



-----Original Message-----
From: Kevin Hawkins [mailto:lists@xxxxxxx]
Sent: 27 June 2003 13:07
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Major panic last night



Just wondering Paul what type of sensor you have in the kitchen - where the
dog was, and what would happen at the house when the alarm went off ??
Sirens ?
Is it possible you got one false alarm in the hall and when the alarm
sounded the dog went frantic and caused a second trip in the kitchen ? Dual
trips are always very worrying - if the trips had occurred instantaneously
on Comfort I might have thought it could be a hardware issue but separated
this is highly unlikely.
If this did persist a good second opinion can be had by using some
separately wired PIR's into say HV and checking to see if any of those had
tripped as well - this is sort of what the 'new' alarm policing
requirements
mandate - that you have two separate technologies (not two PIR's) that can
confirm an intruder - eg break glass and PIR or break beam and microwave. I
don't know if PIR and microwave count - I know they don't if they both
originate from the same sensor as in dual tech's.
Dual technology PIR's have improved my false alarms no end - basically the
units have a microwave and standard PIR in one housing - both technologies
are required to 'trip' before the sensor creates an alarm condition. They
are more expensive than the standard PIR's but not overly so. I replaced
all
my PIR's with these, it eliminated all my thermal creep issues - eg in my
cast iron long radiators which got hot from one end to the other and (I
think) were causing false activations.

Kevin




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