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Old 03-03-2011, 01:04 PM #17
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

Quote:
Originally Posted by saki302 View Post
THe ones we use have some sort of copper slug that pops off when enough heat is applied to them. It takes a LOT of heat, i.e. fire, to get them to pop.

Our apartment heads have a water supply which goes to an alarm box which is monitored- if one pops, the alarm sounds and the fire alarm goes off, and the fire department reponds. If you get caught triggering a false alarm, God help you... (fire department charges are expensive!).

Each one triggers individually, unlike the movies. And the heads are quite expensive!

-Dave
Those have a solder fillet between those slugs. Its melting point is very low. A laser (like a 1W 445) would not do it because of the mass and reflectivity of metal but you would be surprised at what will set them off.

A standard wet system uses heads that are independent of one another. Water flow through the pipe does trigger a flow switch that will set off the building fire alarm, however!

In any case I highly recommend nobody even think of trying this on a sprinkler head connected to a charged system!

Go to a bank or car dealer that has a bucketload of balloons or something.


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Old 03-19-2011, 12:48 AM #18
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

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I think they activate by smoke rather than heat...
Nope, that red piece in the picture melts (it's wax) when there is a fire and releases the water.
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Old 03-19-2011, 03:48 AM #19
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

Indeed, you can activate these things by using a lighter or a laser, the result is exactly the same. The operation is very simple: when they get warm, they start spraying water, regardless of the source of heat.

And its a good thing too, since these will not fire if someone smokes a fag or burns an oven meal underneat one.
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Old 03-19-2011, 06:29 AM #20
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

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Nvm then. Im not gonna do it then if theres bills..
Teres only bills if you get caught ... *goes to find sprinkler*
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Old 03-19-2011, 09:48 AM #21
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

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Teres only bills if you get caught ... *goes to find sprinkler*
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Old 03-19-2011, 01:27 PM #22
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

That one looks like a glass container that will break if the temperature gets too high*. They are local showers only.

There are systems with a low presure for monitoring and a flow detector to signal a presure rise high enough to burst the rest. That gives water over the whole firesection.

*around boiling point.
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Old 03-20-2011, 07:36 AM #23
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

I'm of the opinion that a <2w laser will not set it off.
I wouldn't want to try it though.

-Tony
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Old 03-20-2011, 09:54 AM #24
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Default Re: Anyone ever shine their 1W+ 445 on one of these?

I agree with Toke ! there is a sensor that detects a drop in water pressure when one shower head is tripped, this sensor then turns on a pump that increases the pressure so as to burst other shower heads so that the whole area recieves water !


@ zdarkazn
So you wouldn't do it if there was bills to pay, I do believe you need a spanking
you obviously didn't get a good upbringing if that is all that is stopping you,
think twice befor destroing others property with out there permission
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