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Beam Smoke Detectors

 
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Old 01-12-2020, 08:19 AM   #1
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Beam Smoke Detectors


Hey guys!!

I actually have a On Topic question. With all the years
I have been doing alarms I have actually something new
of sorts.

I will be installing my second Beam Detector (single ended).
Actually, a OSI-RI-SK addressable unit.
It will be installed with a keyswitch for testing.
When I did the first a few years ago during the final inspection.
The inspector never asked me to test it, only looked at it
and everything else, only tripped off smokes and pull stations.

My question is; If the inspector wants to see a test of the
beam detector what would be the proper approved way to do so??

Is there a suggested method??

Has anyone ever had to do a real test??

I have some thoughts but I was wondering what you guys think??

Thanks,

Les
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Old 01-12-2020, 12:33 PM   #2
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Re: Beam Smoke Detectors


i've been involved in testing a couple of dozen beam detectors.

inspectors have allowed two methods for test:

canned smoke

a piece of plywood/cardboard on a pole to disrupt the beam.

both methods have worked well.

another sure fire test is to have a dance in the high school gym and the band used a smoke machine in their act....

it set the alarm off but no one could hear it & they thought the flashing lights were part of the show...

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Old 01-12-2020, 01:03 PM   #3
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Re: Beam Smoke Detectors


Quote:
Originally Posted by griz View Post
i've been involved in testing a couple of dozen beam detectors.

inspectors have allowed two methods for test:

canned smoke

a piece of plywood/cardboard on a pole to disrupt the beam.

both methods have worked well.
That is how we used to do it also, if they were in the main section of the air handler the door switch had to be bypassed to allow detector to be tripped
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Old 01-12-2020, 01:10 PM   #4
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Re: Beam Smoke Detectors


Hi Griz,

With canned smoke I would assume that you need to be fairly close
to the beam. The floor on this one will be some 25 feet to the peak.

As for wood and cardboard I can only imagine that the residual smell
may be objectionable by the owner.

If I can get a "blessing" I was thinking of a borrowed CO2 Extinguisher.
Refill it afterwards.

That is, if I can't borrow a Smoke Machine from someone.

Do you see any problems with CO2??

BTW had a band that during its performance thought that fire crackers
and sparklers would be good to show off along with a smoke machine.

Needless to say the Photoelectric Smokes caught the moment!!

Thanks for the input!!

Les
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Old 01-12-2020, 01:33 PM   #5
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Re: Beam Smoke Detectors


yes, you must be close for the canned smoke to work well.

the plywood/cardboard on a pole was used in a gym, when all the ladders & lifts were gone.

you just hold it up on the target end to disrupt the beam.

not sure if the co2 would be an accepted method.
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Old 01-12-2020, 01:50 PM   #6
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Re: Beam Smoke Detectors


Quote:
Originally Posted by griz View Post
yes, you must be close for the canned smoke to work well.

the plywood/cardboard on a pole was used in a gym, when all the ladders & lifts were gone.

you just hold it up on the target end to disrupt the beam.

not sure if the co2 would be an accepted method.

Griz & All,

Approved or not would CO2 trip the beam?? Yes, maybe or no??

Or is there something about the CO2 fog that is different??

I am only asking in the respect to scientific knowledge, not
what the AHJ might think or makes him/her happy.

Thanks!!

Les
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Old 01-12-2020, 02:02 PM   #7
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Re: Beam Smoke Detectors


CO2 fog may not have the particulate matter necessary to disrupt the beam.
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Old 01-12-2020, 02:14 PM   #8
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Re: Beam Smoke Detectors


Quote:
Originally Posted by griz View Post
CO2 fog may not have the particulate matter necessary to disrupt the beam.
Interesting thought...................... thanks!!

Maybe it something that needs to be tested.

Les
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Old 01-12-2020, 02:37 PM   #9
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Re: Beam Smoke Detectors


check with the mfr as far as testing methods/requirements.

ASTM likely lists accepted methods also.

whatever method, keep the inspector happy...
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Old 01-12-2020, 02:40 PM   #10
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Re: Beam Smoke Detectors


It only has to block some of the light crossing the beam, steam could set it off it really does not matter.

Griz means waving the wood or cardboard through the beam not burning it.
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Old 01-12-2020, 02:40 PM   #11
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Re: Beam Smoke Detectors


Quote:
Originally Posted by griz View Post
check with the mfr as far as testing methods/requirements.

ASTM likely lists accepted methods also.

whatever method, keep the inspector happy...

No matter how much it hurts!!!
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Old 01-12-2020, 03:04 PM   #12
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Re: Beam Smoke Detectors


Quote:
Originally Posted by rrk View Post
It only has to block some of the light crossing the beam, steam could set it off it really does not matter.

Griz means waving the wood or cardboard through the beam not burning it.

Yes, that is what he said. Maybe miss read a little.

However, as I understand it that would place the unit into trouble not
into alarm.

My thinking is that it needs to seen a gradual change in IR intensity
to determine it is being blocked by smoke.

I guess it depends on the unit had how it is designed to function.

I may have to do more research. aka Reading docs!!

Thanks,

Les
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Old 01-12-2020, 04:11 PM   #13
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Re: Beam Smoke Detectors


Start the place on fire, you’ll know pretty quickly if they work or not

Tom
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Old 01-12-2020, 04:21 PM   #14
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Re: Beam Smoke Detectors


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Start the place on fire, you’ll know pretty quickly if they work or not

Tom
That only works in the movies.
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Old 01-12-2020, 07:21 PM   #15
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Re: Beam Smoke Detectors


Quote:
Originally Posted by ABLE1 View Post
That only works in the movies.
I can start a fire, never been in a movie...

Tom
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Old 01-12-2020, 07:34 PM   #16
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Re: Beam Smoke Detectors


Tom,

I can start a fire as well.

However, going to jail is not something I want to think about.

Have a good week.

Les
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Old 01-13-2020, 12:10 AM   #17
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Re: Beam Smoke Detectors


Quote:
Originally Posted by ABLE1 View Post
Yes, that is what he said. Maybe miss read a little.

However, as I understand it that would place the unit into trouble not
into alarm.

My thinking is that it needs to seen a gradual change in IR intensity
to determine it is being blocked by smoke.

I guess it depends on the unit had how it is designed to function.

I may have to do more research. aka Reading docs!!

Thanks,

Les
Les just hold the test filter in front of the sensor.
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Old 01-13-2020, 08:38 AM   #18
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Re: Beam Smoke Detectors


Thanks Inner,

Yes, that will work as well. I am collecting my options.
Depending on the local AHJ (don't know which one at this time)
Could request a different method.

Once I get it installed a working I may try the CO2 just to see what
happens. The main reason for my concern are a couple of Youtube
videos of others testing beam smokes in large spaces.
Different testing procedures. Some a bit radical..........




This is educational for me to some extent.
Maybe also for the others that are reading here.

My goal is always assist the masses.

Thanks for reading.

Les

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