Supervisory Signal-Initiating Device


Supervisory Signal-Initiating Device :

An initiating device such as a valve supervisory switch, water level indicator, or low-air pressure switch on a dry-pipe sprinkler system whose change of state signals an off-normal condition and its restoration to normal of a fire protection or life safety system, or a need for action in connection with guard tours, fire suppression systems or equipment, or maintenance features of related systems

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