Perimiter IR Beams

[mdj1]

Hi All.

I'm looking to get some IR beams for our yard. Is there such a thing as a "passive" receiver?

I wanted to be able to install one half of the unit the other side of the yard, but it's nearly impossible to get power there. Are there any that are passive or battery operated?

Thanks in advance.

 

[sparkymarka]

How far across the yard ? Optex do a battery version

 

[mdj1]

About 10m

 

[mdj1]

Found these http://www.luminite.co.uk/battery-powered-wireless-IR-beams/ No idea on cost though.

 

[mdj1]

They look the same!

 

[mdj1]

Why is this country such a rip off..... 1/2 the price in the USA

 

[Handymanjo]

Optex Bx-80NR
Optex 350QFR
Optex350QNR

 

[E999]

Hi, well Ive fitted many Dakota systems recently and they are fantastic...easy to install, laser like beam mounted at 4ft to avoid false alarms.....really can vouch for this....have installed over a dozen systems in last four months...zero problems I'm pleased to say....brilliant battery life too!


Thx
Matt

 

[GalaxyGuy]

But the link you provided is a PIR and not a beam pair and nothing like a "laser like beam" from a pyroelectric element. Is it the wrong link?

 

[PaulUszak]

I've seen internal IR beams that only have one active component. There is a combined transmitter receiver at one end, and a reflector at the other. Might there be such for external applications? Common sense suggests that you might have issues keeping such a reflector clean for reliable operation.

 

[bernardgreen]

There is a combined transmitter receiver at one end, and a reflector at the other

The problem with these is the simple ones cannot distinquish whether the receiver beam is a reflection from the reflector ( beam not intterupted ) or a false reflection from a shiny object that is interrupting the beam. Hence it may not react to some intrusions.

Better ones transmit vertically polarised light and the reflector converts it to horizontally polarisation. The receiver then only responds to horizontally polarised light. But it is still not perfect. They can also be beaten by criminals.

A good sensor will measure the time the light takes to travel from TX to reflector and back to the receiver and if reflections come back too soon a reflective object is reported as interrupting the beam

 

[PaulUszak]

If it's not too late, I came across this one sided detector as you wanted:-

http://www.cts-direct.net/external-...rnal-reflector-beam-11m-coverage-pr-11b-takex

It's rated to 11m detection distance. Others here will have to attest to it's reliability as I've not used it.

 

[Europlex]

............................................. Common sense suggests that you might have issues keeping such a reflector clean for reliable operation.

Common sense suggests that you might have issues keeping such a reflector clean for reliable operation, IF YOU DON'T CLEAN THEM, WHAT, that is basic information given whenever ir beams are fitted. BUT, even when filthy they still work or have done for the 35+ years I have had to deal with them and that would be with 6mth visits from me giving them a GOOD CLEAN and the customer doing their best in between.

 

[PaulUszak]

Is the PR-11B reliable if kept clean and used internally only?

The reason I was researching them was to find a thingie that could be pressed into service as a pet tolerant volumetric detector. I have an intolerant cat that some might be aware of (http://www.reallyreallyrandom.com/wiki/Wiki.jsp?page=Dominic). It would be convenient to power the detector from one end only as the PR-11B can be. Due to this forum, I'm not convinced that pet PIRs are reliable enough. I think that I've ruled out a curtain PIR turned through 90 degrees as I can't categorically measure the extent of the curtain.

I realise that this isn't the target market for this type of device, but might it be an acceptable compromise between nothing and a not so appropriate but reliable something.

 

[E999]

Is the PR-11B reliable if kept clean and used internally only?

The reason I was researching them was to find a thingie that could be pressed into service as a pet tolerant volumetric detector. I have an intolerant cat that some might be aware of (http://www.reallyreallyrandom.com/wiki/Wiki.jsp?page=Dominic). It would be convenient to power the detector from one end only as the PR-11B can be. Due to this forum, I'm not convinced that pet PIRs are reliable enough. I think that I've ruled out a curtain PIR turned through 90 degrees as I can't categorically measure the extent of the curtain.

I realise that this isn't the target market for this type of device, but might it be an acceptable compromise between nothing and a not so appropriate but reliable something.

Both the Takex and optex are good products but the Dakota is far less susceptible to false alarms....its a twin laser like beam mounted at 3-4ft parallel to floor...
We now have in excess of 30 systems on farms and we fit for a scaffolding company and they are highly portable.....virtually zero false alarms, wireless transmission 200 metres around buildings and the beams are solar!!

We tried ringing CTS half a dozen times to chase an order...you can never EVER get through to anyone...they are a joke!! For Takex products, I always buy through ADI..
CTS costs always look good but I'm not even sure they are a real business.....try phoning before ordering online!!