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Supervisory Signal – A signal indicating the need of action in connection with the supervision of
guard tours, sprinkler and other extinguishing system standards and designated as such by the
Authority Having Jurisdiction.
System Flexibility – Using features that allow for easy adjustment of a particular system to meet
the demands of a given situation.
Tenable Environment – As defined by the NFPA, an environment in which the quantity and
location of smoke is limited or otherwise restricted to allow for ready evacuation though the space.
Transmitter – A system component to which initiating devices or groups of initiating devices are
connected. The component transmits signals to the central supervising station indicating the status
of the initiating devices and the initiating device circuits.
Trouble Signal – An audible signal indicating trouble of any nature, such as a circuit break or
ground, occurring in the devices or wiring associated with a protective signaling system.
TSW – TrueSite Workstation System. The 4190 TSW provides a graphical user workstation
within the Simplex Smoke System.
Visible Signal – A visible signal is the response to the operation of an initiating device by one or
more direct or indirect visible notification appliances. For a direct visible signal, the sole means of
notification is by illumination of the area surrounding the visible signaling appliance.
Waterflow Switch – An assembly approved for the service and so constructed and installed that
any flow of water from a sprinkler system equal to or greater than that from a single automatic
sprinkler of the smallest orifice size installed on the system will result in activation of this switch
and subsequently indicate an alarm condition.
Zone – A designed area of a building. Commonly, zones within a building are annunciated to
rapidly locate a fire.
Glossary of Terms, Continued
Glossary
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