Eurosec Cpx False Alarm Advice

[james.wilson]

er. just to interject.

I have had a few proven ones, twice it was illigal taxi transmitters.

Once the transmitters were repoted and removed problem stopped.

I have also had a site with a radio ham next door that caused issues.

[FASTCAR]

I was watching a police chase from my bedroom window , past my house at 3am...Saab passes doing about 120mph..a few secs later plod passes , the second they pass the front of the house , the lounge pir triggers..the curtains are closed ,no FA in previous 10 years nor since, I did the usual checks just in case, but that could only be RFI.

I can't prove it though.

[Guest anguscanplay]

but that could only be RFI.

or vibration or maybe the siren woke the spider that lives in every detector up ............ LOL, you wouldnt believe the number of times the stealth bomber used to get blamed for false alarms untill the americans admitted it existed

"oh your alarms gone off has it .......... be the americans flying past ........ they got a secret plane no-one can see .....how do we know? ..... Rodgers friend worked on it "

PMSL

[sd6446]

please everyone, take my input as complimantery to above not disrespecting or disagreeing with it,

leaving landing doors open is a bad practice, if you suffer a fire it will spread far quicker than if they were closed, and quicker still if any window is open feeding oxygen to the fire.

there are many many reasons and causes for false alarms, i'd go with the most common 1st, if that fails there's no harm fitting a filter.

speaking personally, i have never yet found a situation that they helped to cure, imho far better to replace an affected detector with a later (so more robust) unit if RFi is suspected.

but 1st things 1st, your system has worked for fine about a year and sufddenly a false alarm, i'm not discounting RFi but i'd expect would likely have shown up sooner with older detectors you have.

so to the most common causes? with landind door/s left open and not held, so 'moving' reflecting heat sources or covering/uncovering them causing a 5 deg per second change so a false alarm.

window/s partly open or small window left open 'for airing' purposes. - just don't do it , even though its been ok in the past you are simply playing Russian Roulette with your neighbours piece and quiet, if you must have a window open then close the landing doors and make sure they are held closed securly by pushing against them once closed - no short cuts end of as its your system it's your responsibility to operate correctly.

if you thinks thats being a little harsh you should 'suffer' one of my hand-overs - and you'd also be paying for it..

you battery may be only a year old, but best to replace it if you can't test it properly with the correct equipment, not unknown for them to be duff from new.

go over each connection in the panel and the detector, testing by gently puling each wire one by one, look for shorting conductors or lose connections, pay special attention to the 12 volt connections that power the detectors, also, look for cable damage like chaffing, knife cuts (by carpet fitters), crushing and rodent activity.

regs

alan

Many thanks again everyone. I shall check all connections, battery etc., and train my wife into ensuring doors are closed! Funnily enough I work in telecoms (Tetra/GSM), but had never considered RF as a problem. Time for a re-think perhaps.

Just one thought - if it was a spider, presumably there's not much you can do to prevent it from happening again (unless you can remove all spiders from the house!)? Are some PIRs better at discriminating against such false alarms from insects?

[Guest anguscanplay]

spray the detector with fly killer .........

[Guest RJBsec]

Just one thought - if it was a spider, presumably there's not much you can do to prevent it from happening again (unless you can remove all spiders from the house!)? Are some PIRs better at discriminating against such false alarms from insects?

Make sure that all entrance holes to the PIR are sealed so that they can't get inside.

Some people use Vaseline on the PIR case to discourage them but too messy IMO, others give the unit a spray of insect killer every now and then (not directly on the lens though).

A dual-technology sensor would generally provide such discrimination (but it could be more susceptible to RFI if that's the cause).

[arfur mo]

spray the detector with fly killer .........

spray is only short term 4 - 6 weeks effect (look on the can - spent hours in the sheds and on line looking for one which was stronger), also can discoulour the casing and wall around it soo ruling 'alf not too impressed. if overspraying occurs and gets onto the pyro then like a finger print on the pyro lens (old so may not have lens anti-ingress mask) it will likely make the unit unstable and so to false alarm from that cause.

i'd advise once a month stick the vacuum cleaner hose close to it, especially behind and above, spiders are most active and from spring till autumn so suck the blighters out. with the landing one as it has activated best open and remove pcb as trey tend to lodge between it and the back case, don't be surprised at seeing one e enormous spider as you might be expecting omly little ones - but they eat each other sort of last man standing.

plastercine, blue tak will seal the holes as will chewing gum (best you don't let the wife/client see do that though guys, and you can just imaging the look of total disgust on your mates face whoever opens it next time )

regs

alan

[sd6446]

spray is only short term 4 - 6 weeks effect (look on the can - spent hours in the sheds and on line looking for one which was stronger), also can discoulour the casing and wall around it soo ruling 'alf not too impressed. if overspraying occurs and gets onto the pyro then like a finger print on the pyro lens (old so may not have lens anti-ingress mask) it will likely make the unit unstable and so to false alarm from that cause.

i'd advise once a month stick the vacuum cleaner hose close to it, especially behind and above, spiders are most active and from spring till autumn so suck the blighters out. with the landing one as it has activated best open and remove pcb as trey tend to lodge between it and the back case, don't be surprised at seeing one e enormous spider as you might be expecting omly little ones - but they eat each other sort of last man standing.

plastercine, blue tak will seal the holes as will chewing gum (best you don't let the wife/client see do that though guys, and you can just imaging the look of total disgust on your mates face whoever opens it next time )

regs

alan

Nice one, thanks again everyone!

(Not sure what my wife will say as I head upstairs with a pot of Vaseline and the Hoover... )

[Guest anguscanplay]

(Not sure what my wife will say as I head upstairs with a pot of Vaseline and the Hoover... )

ROFLMAO

[Rulland]

Last line brilliant Steve !!!!.

Vaseline makes the buggers slip and break their necks-hoover to get rid of the nasties.

It depends on how gullible the missus is

Richard.