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Signaline HD analogue heat sensing cable must be used with a Signaline HD controller and End of Line Unit. These enable the Signaline HD heat sensing cable to be fully monitored for open and short circuit. The controllers are equipped with volt free fire and fault relays that are connected to the fire control panel via an Interposing Line Unit. Alternatively the Controller can be used as a stand alone device using the relay contacts to activate subsidiary equipme