[SML] Smoke vs Heat vs Rate of Rise detectors

[Bill Conner]

Most modern heat detectors are both rate of rise and fixed temp, so just
avoid particle (smoke). (In US, no option in return air other than
particle. Am working on a code change to fix that.)  I've not formed a
strong opinion on the beam detectors.  Had one that shot across a catwalk.
Move past that point fast and no problem, but stop a second and alarm
activates.  Another project helium balloons in house set it off.  But maybe
with thought on placement they'd be OK.

On Mon, Mar 7, 2022, 7:29 PM Riter, Andrew via Stagecraft <
stagecraft at theatrical.net> wrote:

> The university has said our entire fire alarm system needs to be upgraded.
>
>
>
> When designed in the late 90s (opened in 1997), the designers put heat
> detectors in the venues, but missed the “shared” areas that look like
> separate rooms on the drawings but actually share the same air (they put
> smoke detectors in the pit, Front of House Cove, venue light locks, and air
> return system).
>
>
>
> I’d love to take this opportunity to replace a bunch of the smoke
> detectors with Heat detectors, but I believe there is a difference between
> Rate of Rise detectors and “set off at x degree level of heat” detectors.
>
>
>
> Can anyone give me a quick primer on these types of heat detectors, and
> advantages / disadvantages of each?
>
>
>
> Thanks everyone.
>
>
>
> *Andrew M. Riter*
> Assistant Technical Director, Head Lighting Technician
> Chan Centre for the Performing Arts
> The University of British Columbia | Vancouver Campus
> 6265 Crescent Road | Vancouver BC | V6T 1Z1 Canada
> Phone 604 822 2372
> andrew.riter at ubc.ca
>
> [image: UBC E-mail Signature]
>
>
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