Cross Zone Pool/Elk M1G

jmed999

Active Member
I'm implementing the cross zone pool for my motion sensors and my question is if I have 3 motion sensors in the pool, do all 3 have to be violated our just 2? So is it just 2 of the pool or all of the pool regardless of how many motion detectors I have?

Also what is the downfall to maxing out the cross zone pool time?

Thanks for your help!
 
Take a look at the FPN on page 32 of the manual for exact specifics.

Cross zone should only be 2 detectors, or possibly a single detector depending on how self verify is programmed. The longer the time in verification, the more likely it would be possible to generate a false event, no different than a non-cross zoned point, assuming that you're using cross zoning to help eliminate enviromental or other false alarm sources.
 
Why couldn't/shouldn't I use 3 or more motion detectors in a cross zone pool?

Seems like using 3 would increase the chance of the intruder being "seen" by 2 motion detectors and still give less false alarms than without using the cross zone pool.
 
Possibly my statement wasn't completely clear or it was misread.

[quote name='DELInstallations' timestamp='1352902248' post='183412']
Cross zone should only be 2 detectors, or possibly a single detector depending on how self verify is programmed.
[/quote]

The statement is regarding how many detectors or faults that initiate the alarm event, either a double knock on a single detector/zone or 2 separate units and zones.

Truthfully, I'd be considering the system design first as cross zoning is typically implemented as a bandaid solution to a false alarm problem or even a system design issue for most applications.Usually cross zoning would be only be used in a location where false alarms are exceptionally prone, such as outdoor detectors, not within a controlled space.
 
Possibly my statement wasn't completely clear or it was misread.



The statement is regarding how many detectors or faults that initiate the alarm event, either a double knock on a single detector/zone or 2 separate units and zones.

Truthfully, I'd be considering the system design first as cross zoning is typically implemented as a bandaid solution to a false alarm problem or even a system design issue for most applications.Usually cross zoning would be only be used in a location where false alarms are exceptionally prone, such as outdoor detectors, not within a controlled space.

[font=Arial']Sorry if I misread you answers. Thanks for replying![/font]

[font=Arial']Your 1st post said Cross Zone Pools "should" only be 2 detectors. I assumed that to mean no more than 2 detectors should be used in a cross pool. My question was, "if I have 3 motion sensors in the pool, do all 3 have to be violated our just 2?" You second answer was, "The statement is regarding how many detectors or faults that initiate the alarm event, either a double knock on a single detector/zone or 2 separate units and zones." That answer sounds like more than 2 can be in a pool which contradicts the first answer.[/font]

[font=Arial']You may see how I'm getting confused. [/font]

[font=Arial']If I have 3 motion detectors in a cross pool, do all three have to be violated or only 2 detectors within a pool"?[/font]

[font=Arial']Thanks again and maybe some others will also chime in.[/font]
 
Because I don't have a 3rd detector and wouldn't want to buy a 3rd one if it required all 3 to be violated for an alarm.

Thanks for your answer!
 
Because I don't have a 3rd detector and wouldn't want to buy a 3rd one if it required all 3 to be violated for an alarm.

Thanks for your answer!

You can still test it by opening or closing 3 zones regardless of whether it is motion or a window or door or whatever.
 
More than 2 can be in a cross zone pool, however various programming options would determine how they'd behave.

If you have self verification enabled, then that would mean the same detector generating an alarm event twice within the time specified by the panel will generate an alarm at the panel.

If this is not enabled, then if any two of the hardware zones you put within the pool trip, then you'll get an alarm at the panel.

The generics of it would be the first trip of a zone within the pool "arms" the event with the second trip of the same (verification enabled only) or different (pool) detector would set the system off. It makes no difference how many detectors are in the pool, since they're all common to each other.

Then the time selection would determine if you can have the first trip expire before another event happens from within the pool which would either generate an alarm or not generate an alarm based on the time value selected..

Think of it like 2 open switches wired in series, the first closes for 5 seconds, if the second closes within that 5 second period, you have a circuit. If it's longer than 5 seconds, no circuit. In the case of a pool, it's the equivalent of the panel seeing a pair of switches, no matter what the order, as long as the "zones" are contained within the software point of "cross zone pool".
 
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