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Ceiling Motions for really tall rooms

R

Randall

Jan 1, 1970
0
I would like to use 360 motions but the rooms in question are 25ft tall.
None of my standard gear goes that high in the spec sheets. Anyone have any
suggestions?
 
N

nick markowitz

Jan 1, 1970
0
I would like to use 360 motions but the rooms in question are 25ft tall.
None of my standard gear goes that high in the spec sheets.  Anyone have any
suggestions?

Risco-Rokonet makes one that works that high
 
B

Bob L

Jan 1, 1970
0
Randall said:
I would like to use 360 motions but the rooms in question are 25ft tall.
None of my standard gear goes that high in the spec sheets. Anyone have
any suggestions?


Aleph has a couple, but they do not list them on their website for some
reason. I have used them in insulated metal warehouses with good results,
although I prefer to cross cover and do "zone anding" in warehouses to
prevent false alarms.
 
A

alarman

Jan 1, 1970
0
Randall said:
I would like to use 360 motions but the rooms in question are 25ft
tall. None of my standard gear goes that high in the spec sheets. Anyone
have any suggestions?

Can you suspend them on a 10' stick of emt?
 
J

Jim

Jan 1, 1970
0
I would like to use 360 motions but the rooms in question are 25ft tall.
None of my standard gear goes that high in the spec sheets. �Anyone have any
suggestions?

You didn't say what the application is ...... commercial, residential,
retail ......... ?

The following is a little out of the ordinary but I've found that
sometimes in commercial applications, 360 detectors can be a problem
due to changing of the surroundings, heating, ventilation, blockage.
And, if mounted too high, can be a PITA to adjust..... which is
sometimes and on-going necessity because they cover .........
EVERYTHING!
And .... in rooms with windows, they are looking right out at the
windows, exactly what you DON'T want.

A number of years ago, I had the opportunity to do some experimenting
on a job in a building that was going to be occupied while inside
construction continued.They were going to arm and disarm the system
but not go on line due to construction people possibly setting off
the alarm. I set the system up to send opening and closings .... and
to report alarms to central ...... but to only report to me.

Since there was a lot of glass at the entrance ways, along with lots
of air movement from heating, AC and ventalation .... and suspended
gas heaters in the warehouse I tried something that worked out pretty
good.

I mounted standard motion detectors on the ceiling ..... looking down
at the floor. In some of the entranceways and in the main lobby, I
mounted the motion detector on the 25 foot ceiling with the top array
of the motion detector creating a "barrier" about ten feet back from
the 30 foot wide glass front ..... with the lower two tiers of the
array looking back at rest of the shaded lobby. My concern was that
the lobby faced west and the sun was going to be a problem along with
some decor items near the windows, that could move about with air
movement. Also the owner was very picky about seeing a motion detector
on the wall in his beautiful new building entrance. ( It was his
whining that got me thinking about this use of standard motions on the
ceiling)

In the warehouse, with the forced air heating, plastic wrap and other
"flappable" items would have created problems. So I mounted motion
detectors on the ceiling looking down and masked the lower two tiers
of the array. Wall motions were bound to be blocked or crushed
eventually and would have been in the path of air movement from the
heaters anyway. The array of the motion detector looks straight down
at the aisle floor and is just wide enough at the floor, so that it's
very difficult to get by without setting off the motion .... but due
to the divergence of the field of view of the motion detector, the
plastic from the items on the racks don't get picked up. The
divergence of the "beam" of long range, narrow beam motion detector
mounted at the end of an aisle, will pick up motion on the shelves
when the "beam" gets wider than the aisle.

I was able to monitor the system for appoximately 4 months and there
were no false alarms due to the environment.
It's about four years now and except for the truck drivers not knowing
how to disarm the system (Duh) when they come in at 4 AM to pick up
their trucks, the system is false alarm free with good "catch" in walk
tests.


Since two motions were required in each aisle in the warehouse, one of
the fallback plans was to use zone "anding" but I didn't even need to
do that. I used straight PIR's ......... no dual tech motions because
the microwave detection would be all but useless in this kind of
application.

It was a great experiment that worked but I've never had a use for it
since.
 
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