RayPooley

The local council wouldn't allow shutters on all of the windows. Only the large ones and even then they insisted as a condition of the planning permission that the shutters must be fitted on the INSIDE of the windows. You think I'm kidding don't you? I'm not. Will do. Thanks for your help.

Just telling it like it is. You are wiring things together.

Here's the thing. A basic PIR only detects infra read heat. Right? In particular infra red radiation that is above that of the surrounding environment. Furthermore, having tested mine, they only trigger when that "hot spot" is moving. They are basically motion sensors. The same as the technology I have in the toilets that turn the lights on when someone walks in. And loose bricks tend to be at ambient temperature. So I wouldn't expect a basic PIR to detect a flying brick unless the brick had been basking in the sun so that it was significantly hotter than the space around it. But that's a bit hit and miss. So I am looking for something that doesn't rely on infra red radiation. That's why I have gone for the Dual TEC infra red and microwave technology.

I don't make a habit of interviewing service providers. I don't have the time. I tend to take them at their word or, at least, the words on their advertising.

I don't intend to. I can't afford to pay for a force field around the building and NASA won't let me have one for free. So the next best thing is to detect the brick as it enters air space and is flying through the air as it enters the window. It seems reasonable to me that any cold flying objects inside the building during closing hours have come from outside so it's something one should be aware of as soon as possible.

Two degrees and a Masters actually. But I'm not the first and I won't be the last to put my faith in an incompetent service provider. Thanks again although it's probably the brick I need to detect more so than the glass. What do you think?

The PIRs have been fitted for three years. If you read my previous response to other members you will get a better idea of the context. If your'e interested of course. There seems to be surprisingly little in depth information about these sensors on the suppliers' web sites.

The commentator above doesn't know enough about me or my background to pass judgement. As I said, there is nothing complicated about this stuff. It's just a matter of familiarization.

Thanks for the input. Are the break glass sensors wall mounted?

The more I read about this stuff it's practically plug and play.

PIR only were fitted when premises were kitted out. Had a brick thrown through the window. Alarm didn't go off. Someone suggested fitting Dual TEC instead of PIR only. Allegedly the microwave technology will detect flying bricks. I have bought a Dual TEC sensor. I am looking for a PIR sensor that matches the ones in place. They are not marked. Aissecur suggested it might be a Crow make. I need to check that out. What I want to do is to buy and test the PIR and the Dual TEC side by side on a bench before doing anything with the existing system which is something I should be able to do. So I am in the planning phase at the moment.

It's my cafe and I own the premises. I had it installed by someone who claimed to be a security installer, at least that's what he had on his van, yet, as others have pointed out, it appears to be a cr@p job. I am a BSc qualified Mechanical and Electrical Engineer. It appears it might have been better had I installed it myself. Then I wouldn't be having to change the sensors now. I certainly think I am more qualified to do so than the guy who did. As I pointed out in my original question I have done my research and reached a conclusion. However it is always wise to seek the opinion of those who have gone before you. Hence my question the answers to which have confirmed my conclusions. This isn't rocket science. It's not even ordinary science. There is nothing at all complicated about this stuff. Only unfamiliar.

I am not sure what a "zone" is in this context configuratively speaking so I will take your word for it.

I'm talking about the power supply. But even if I wasn't I don't agree with your conclusion. If I have a bunch of sensors independently going back to the control unit it would only take one to send a signal back and trigger the alarm. That's good to know. I will check that out. I did try to find one because I wanted to test both of them before going near the system. They are only cheap. No luck though.

Thanks SWB. I was just wondering about that. I am not a sec installer but I am a mechanical and electrical engineer who is just not familiar with this type of tech application but I was wondering about that as a standard ie: wiring these things in series. In this context it would be more secure if they were all connected in parallel. That way a loose connection doesn't take out all of the sensors. There are 4 PIR sensors and it wouldn't surprise me if they were all in series. I will know when I lift the covers on the other three which I haven't done yet. But I'm not in a position to make any config changes anyway. All the wiring is buried and it would involve too much upheaval. They are in a busy cafe and it's open 7 days a week. I just need to swap the sensors. Thanks for the confirmation. Thanks James. Appreciate it.

Hi all I would appreciate your advice if that's ok. Here's the issue. I have 4 PIR sensors of unknown manufacturer and I want to replace them with Honeywell Dual TEC DT8016F5 sensors. It should be a straight swap I suppose but when I compare the terminal blocks of the two sensors the PIRs have 8 terminals but the Dual TECs only have 6 terminals. I have attached a picture of each terminal block. The blue one is the PIR. The black one is the new Dual TEC. As you can see, the PIR has 4 connections made: 2 yellow to the "Relay" terminals and 2 to the supply terminals. My question is: which terminals on the new Dual TEC terminal block do I connect the yellow "Relay" wires to? I believe that the two "T" terminals on the new dual TEC are tamper terminals and that the terminals I need to use for the yellow wires are the C and NC terminals. I also believe that it doesn't matter which of the two existing yellow wires goes to which C or NC terminal. As you can see the tamper terminals on the old PIR are unoccupied. This is why I think the C and NC terminals are the ones I need to connect these "Relay" wires to. Can anyone confirm my beliefs this or set me straight? There is no wiring information on the documentation that comes with the Dual TEC sensors and I sent Honeywell a couple of emails to their support email account but nobody responds. If you folks could help me out here I would very much appreciate it. Thanks and regards Ray Pooley