Todd To my knowledge the beam detectors available are not designed to be located in this high an ambient temperature.
Would the manufacturer allow them to operate through some type of glass, and be located outside the heat? (Most techs are not really competent to install beam detectors. Most miss that instead of hit and miss aiming, the detectors have jacks on the front. Use a DC voltmeter, adjust for highest voltage, and voila, best aimed. It's amazing what those engineers put in the instruction docs!) Protectowire is a quite stable product line. Again in a high temp area one needs to look at all the details, down to correct connections. Remote from panel? Some designers miss that once out of hazard area you can transition to a normal, conventional cable for run to panel. For small areas you do not even need a Protectowire panel. Protectowire is manufactured intentionally with a higher ohms/lf than normal cable. You can use it as long as you stay below the ohms allowed on a normal FACP's detection circuits. Common is 100 ohms. Applying a safety factor a length of Protectowire with 80 ohms on a detection circuit is commonly used by the knowledgeable AFA designer. 80 ohms/0.185 ohms/lf = a typical length of detection wire acceptable on a releasing detection circuit. I might encourage you to look at who would inspect final install regardless of panel used. Specification, design and install are not rocket science. But they do require following the manual, and to use all the connecting parts required. And they are all more expensive than normal in the van parts. And FM of course has discussion of linear heat detection cable for releasing service. Best Bruce Verhei Sent from my iPhone > On Jun 12, 2017, at 08:34, [email protected] wrote: > > I am working on a facility with a pre-action system in an industrial facility > with ambient ceiling temperatures in excess of 200 degreesF. They have had a > problem with accidental activations, mostly due to the (electronic) detection > system. Is there a good resource for various options for detection? The > standard ones are proving problematic. > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860-535-2080 (ofc) > 860-553-3553 (fax) > 860-608-4559 (cell) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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