PIR Alarm sensors in conservatory?

[Aviz]

I've had a bit of a google, and some say use Dual tech PIRs, some say they wouldn't bother using PIR in conservatories due to temp variation and false alarms. Unfortunately, if i don;t use a PIR, then it will be one hell of a job to alarm each window and door, plus glass break! (14 windows and doors!).

I have some of my AV kit in there, otherwise i wouldn't be so bothered.

I'm thinking of taking the plunge and trying one of these as it's only the other side of the wall from my lounge PIR, and would be quite easy to fit, but does anyone have any real world experience of PIRs in conservatories??

http://www.ebay.co.uk/itm/HONEYWELL-DUAL-TECH-MOTI...

Cheers

Andy

[markbigears]

Hi Andy, had a dual PIR in the conservatory in my previous house, worked a treat, never had a false alarm in all the time it was there.

[softtop]

you could depending on your control panel have dual activation, ie two detectors. If they both trip you get an alarm condition.

[Driller]

Without sounding too dramatic, if I had AV stuff in a conservatory I would have nothing less than shock detectors and door/window contacts on everything. With a PIR they have the time to create an entry point then they could just grab something quick and get away.

[Aviz]

Driller said:

Without sounding too dramatic, if I had AV stuff in a conservatory I would have nothing less than shock detectors and door/window contacts on everything. With a PIR they have the time to create an entry point then they could just grab something quick and get away.

I see your point. I probably over egged the AV kit. I mean my old 32" LCD and a DVD player. I don;t really live in a crime hotspot, so not really expecting anyone to even get round the back of the house.

14 door contacts and several shock sensors would be a bit OTT when i offset it against risk.

Thanks for the comments so far. I think i will give it a go with a dual PIR, and see how it goes.

[Meeja]

A decent dual-tech sensor will work fine... Just try to make sure that you mount it so it doesn't look directly at the sunlight (although as a dualtec sensor, even that shouldn't be an issue)

I'd still put door contacts on as well though... Don't just rely on a PIR.

[anonymous-user]

I have PIR's in the garage and have never had a false alarm so I doubt a conservatory will cause trouble.

[Aviz]

Meeja said:

A decent dual-tech sensor will work fine... Just try to make sure that you mount it so it doesn't look directly at the sunlight (although as a dualtec sensor, even that shouldn't be an issue)

I'd still put door contacts on as well though... Don't just rely on a PIR.

Thanks, i will look at putting a set of door contacts on as well.

[Meeja]

Dave_ST220 said:

I have PIR's in the garage and have never had a false alarm so I doubt a conservatory will cause trouble.

Even in a garage - would be putting dual techs in - it reduces the chance of false alarmsa greatly for literally a few pounds.

Conservatories are more problematic than garages for PIRs as the change in ambient temperature can be more dramatic than a garage, and the chance of direct sunlight is greateer due to the amount of glass!

[anonymous-user]

Meeja said:

Even in a garage - would be putting dual techs in - it reduces the chance of false alarmsa greatly for literally a few pounds.

Conservatories are more problematic than garages for PIRs as the change in ambient temperature can be more dramatic than a garage, and the chance of direct sunlight is greateer due to the amount of glass!

True!!

[Westy Pre-Lit]

In a conservatory you need a temperature compensating PIR due to rapid heat variations, something like this.

http://www.onlinesecurityproducts.co.uk/other-pirs...

Edited by Westy Pre-Lit on Thursday 1st September 21:53

[Aviz]

Rustie said:

This will work a treat mate -
http://www.citysecuritysystems.co.uk/index.php?rou...

Never had a problem with false alarms and ive installed countless numbers of them now.

Thanks, that's the exact one I was thinking of in the link at the start of the thread!