Spacing for Addressable Heat Detectors

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Anonymous Poster	Spacing for Addressable Heat Detectors 10/28/2008 5:49 AM
	We have to construct one storage shade for four electromechanical machines and some polyethylene container liners; as per comments from the project team, we need to install addressable heat detector(s). Area is safe that is not classified. The storage shade dimensions are 10M (Length) X 08M (Breadth) X 05M (Height). The proposed heat detectors shall be wired to the nearest local FACP through a Terminal Box/Junction Box provided locally within this proposed shade. The question is the spacing requirement for the installation of addressable heat detectors of a specific make/model. Appreciate your kind immediate advice, thanks.
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Vulcan Guru Join Date: Oct 2006 Location: Northern Mindanao, Philippines Posts: 2147 Good Answers: 53	#1 Re: Spacing for Addressable Heat Detectors 10/28/2008 8:15 AM
	Different brands have different specs. Note also that the shape of the roof/ceiling and whether there are obstructions can influence the performance of the detectors. If the roof is inclined, install the detectors at or near the peak. Heat tends to rise and will collect there. If you install below the peak, the heat will have to build up until it reaches the level of the detectors before it triggers. Then, if there are horizontal beams crossing the ceiling, you may have to install the detectors in each section bisected by the beam. The heated air will have to cross over to the adjacent section by passing underneath the beam. regards, Vulcan __________________ Miscommunication: when what people heard you say differs from what you said. Make yourself understood.
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JE in Chicago Guru Join Date: Apr 2008 Location: Chicago Posts: 3990 Good Answers: 144	#2 Re: Spacing for Addressable Heat Detectors 10/29/2008 3:12 AM
	two down the middle will suffice . four spaced so they are about three feet from the outside walls if you want to go wild. if the space gets summer hot.. like an attic.. use the high temp versions. I'd use heat/smoke detectors.. a good thing for $40 more none of the gear should belch smoke at any time I've personally installed thousands of FA system components __________________ High Tolerance is Beautiful
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Anonymous Poster	#3 Re: Spacing for Addressable Heat Detectors 11/05/2008 8:25 AM
	As suggested by others the response time of a heat detector depends on the spacing between two detectors and most important the height of the detector from the source of the heat. such detectors are also termed as point detectors for the simple reason that the spacing between two detectors almost remains unprotected. The environmental temperature with the area to be protected also plays a vital role on the response time, naturally because at lower temperatures heat rise will be much slower. Another drawback of these detectors are that they are fixed temperature rated and not configurable to suit the area of installation. A better option is to go for linear rate of rise temperature sensors which can be configured to a wide range with data logging facilities. The most ideal is the metallic tube linear heat sensing element wherein ever mili meter of the tube length acts as a heat sensor and the sensor tube can either be traced along the body of the equipment or suspended just over the equipment, either way you will get a alarm response time as low as 5 to 7 seconds. If you would like to have further details of this technology please mail me at denzil_lopes@yoahoo.co Regads Denzil
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Anonymous Poster (1); JE in Chicago (1); Vulcan (1)

You might be interested in: Motion Detectors, Liquid Leak Detectors, Smoke Detectors

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