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Heat sensor cable can be defined as “continuous” thermal detector, in opposition to “point” thermal detector and it is an economical easy to install fire detection system. Its installation is very easy like its maintenance: it is a cable to be installed just as it is, possibly using brackets and some joint boxes. For this reason it is one of the easiest fire detection devices to lay (set). The rest time is very short (10 seconds for direct flame) taking into consideration that heat sensor cables are usually laid very close to potential focus and there is no strict dependence from air convention and environmental temperature variations and fluctuations, this at least within very wide limits (such to point thermal environmental variations cause significant variations to heat sensor cable ohm resistance). Besides, the cable is practically false alarms free that is quite frequent for other devices more sensitive to electromagnetic and environmental thermal fluctuations.