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Is there any recommended minimum temperature allowance between the specified maximum normal ambient and minimum alarm temperature?

April 26, 2017alarm allowance Ambient maximum minimum normal recommended temperature

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Is there any recommended minimum temperature allowance between the specified maximum normal ambient and minimum alarm temperature?

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A. International standards (UL521) recommend a minimum of 11C/20F between maximum specified ambient and the linear detection system alarm temperature. Please remember that local hot spot temperatures should also be considered in alarm temperature selection – for example: • steam pipes • heaters or halogen lighting • Reflected sunlight on a floating roof fuel storage tank.