Guest demuss Posted October 19, 2004 Share Posted October 19, 2004 I've just installed a Premier 24 using several Texecom Mirage Quad PIRs. Should I be setting all the PIR zones to Double Knock? Thanks Anthony Link to comment Share on other sites More sharing options...
Guest Posted October 19, 2004 Share Posted October 19, 2004 Link to comment Share on other sites More sharing options...
Brian c Posted October 19, 2004 Share Posted October 19, 2004 Not it if you want it to conform to regs! If you don't know......ask. Link to comment Share on other sites More sharing options...
Guest IM_Alarms Posted October 19, 2004 Share Posted October 19, 2004 Dont even think about it ! Link to comment Share on other sites More sharing options...
Guest IM_Alarms Posted October 20, 2004 Share Posted October 20, 2004 Double knock is not really designed to be used on a PIR, hence the name 'knock', the PIR should be capable of doing it's only filtering without having to resort to an un-ethical method like DK. If the sensor ain't doing the job properly, adjust it or get rid of it. Link to comment Share on other sites More sharing options...
Brian c Posted October 20, 2004 Share Posted October 20, 2004 Double knock on PIR's is not a breach of 4737 but the number of inputs needed for a zone to create an alarm condition must be shown on the spec.That said, its not recommended because if you need DK to reduce false alarms on a PIR then the PIR is either faulty or not suited to the environment. Personally I would only use DK if the customer insisted on it (some more informed customers do), or if the PIR was on an access route. 28217[/snapback] ----------This is how I came to that conclusion;--------- If you don't know......ask. Link to comment Share on other sites More sharing options...
Brian c Posted October 20, 2004 Share Posted October 20, 2004 Evening Brian, happy wednesday mate!PS any chance of a summary of that, Im knackered 28258[/snapback] Ha Ha you too mate! Basically, If the default time on the premier for DK is 30 secs and a contact(for examples sake) prog'd for DK opens, it would have to stay open for 30 secs (or open again within 30 secs) to cause an alarm. BS4737 is stating that any detector that is open for more than 800mSecs should cause an activation within 5 secs. Therefore, in breach of BS4737. If you don't know......ask. Link to comment Share on other sites More sharing options...
norman Posted October 20, 2004 Share Posted October 20, 2004 Obviously putting a contact on DK is daft and you wouldnt want to do that, but I'm 99% certain that a movement sensor can be if agreed with the customer. As I said above though its not soemthing that I would want to do. 28263[/snapback] How about DK on a leaf of a revolving door? Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
Paul P Posted October 20, 2004 Share Posted October 20, 2004 I'm 99% certain that a movement sensor can be if agreed with the customer. 28263[/snapback] Not according to our inspector he has a thing about DK & locked engineer codes. Both are a no no. Paul Trade Member Link to comment Share on other sites More sharing options...
Guest Posted October 21, 2004 Share Posted October 21, 2004 Not according to our inspector he has a thing about DK & locked engineer codes. Both are a no no.Paul 28274[/snapback] Even if equipment is owned by an alarm company?? Link to comment Share on other sites More sharing options...
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