Potter Releasing Systems - Manual (Page 9)

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Stratification - An effect that occurs when air containing smoke particles or products of combustion is heated by burning
material, rises until it reaches a level where there is no longer a temperature difference between it and the surrounding air.
Supervision - A visual and audible alarm signal given at the central safety station to indicate when the system is
in operation or when a condition that would impair the satisfactory operation of the system exists. Supervisory
alarms shall give a distinct indication for each individual system component that is monitored.
Supervisory Signal - A signal indicating an “off normal” condition on the fire suppression system. Examples
include, tamper indication, low air pressure and low building temperature.
Thermal Lag - The difference between the operating temperature of a thermal detector and the actual air temperature.
Two Wire Smoke Detector - A smoke detector which initiates an alarm condition on the same pair of wires that
supply power to the detector.
Wet Pipe Sprinkler System - A sprinkler system employing automatic sprinklers attached to a piping system
containing water and connected to a water supply so that water discharges immediately from sprinklers opened
by heat from a fire.