Zone, Circuit, NC C, Relay. All the same thing in this instance.

Are you taking payment for this job?

from the questions you are asking you seem to struggle with the basics, are you aware that if the place gets done over if its worth their while the insurers can pursue you if the system fails to perform as it should?

do you hold efficacy insurance?

2 hours ago, petrolhead said:

Are you taking payment for this job?

from the questions you are asking you seem to struggle with the basics, are you aware that if the place gets done over if its worth their while the insurers can pursue you if the system fails to perform as it should?

do you hold efficacy insurance?

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. 

Hi Ray, may I ask what is the reason for changing the sensors in the first place?

If they satisfactorily detect within the area they are projected towards / you are not experiencing any false alarms and register at the control panel when triggered.. It may be worth keeping them installed.

4 minutes ago, aissecur said:

Hi Ray, may I ask what is the reason for changing the sensors in the first place?

If they satisfactorily detect within the area they are projected towards / you are not experiencing any false alarms and register at the control panel when triggered.. It may be worth keeping them installed.

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.  

2 hours ago, petrolhead said:

Are you taking payment for this job?

from the questions you are asking you seem to struggle with the basics, are you aware that if the place gets done over if its worth their while the insurers can pursue you if the system fails to perform as it should?

do you hold efficacy insurance?

Come on be serious , no one can do jack , you install a system they take no contract and don't have it attached to insurance etc 

 

However if the cafe owner took a discount from there insurer gets done over when they ask for the cert etc they simply won't pay out 

3 minutes ago, al-yeti said:

Come on be serious , no one can do jack , you install a system they take no contract and don't have it attached to insurance etc 

 

However if the cafe owner took a discount from there insurer gets done over when they ask for the cert etc they simply won't pay out 

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

The dual technology sensor is not designed to be more sensitive, but less so. It's designed to reduce false alarms by requiring both PIR and Microwave technologies to trigger together in order to activate the zone.

 

You need to look at break glass or vibration sensors to detect the brick. The Honeywell Flexguard glass detectors and Viper vibration sensors are decent devices.

 

Most alarm detection devices are 12v DC with clean contacts, so are interchangable. Only the wireless devices are vendor specific due to the varying protocols and frequencies being used.

Until something complicated needs to be done .....

 

But competent diyers don't ask question you have asked above , I think that's what was meant above

4 minutes ago, GalaxyGuy said:

The dual technology sensor is not designed to be more sensitive, but less so. It's designed to reduce false alarms by requiring both PIR and Microwave technologies to trigger together in order to activate the zone.

 

You need to look at break glass or vibration sensors to detect the brick. The Honeywell Flexguard glass detectors and Viper vibration sensors are decent devices.

 

Most alarm detection devices are 12v DC with clean contacts, so are interchangable. Only the wireless devices are vendor specific due to the varying protocols and frequencies being used.

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