Fire - Glossary of Terms Fire Glossary of Terms Addressable Device
A fire alarm system component with discreet identification that can have its status individually identified, or that is used to individually control other functions.
Air Sampling-Type Detector
A detector that consists of a piping or tubing distribution network from the detector to the areas being protected. A fan in the detector housing draws air from the protected area back to the detector. The air is analyzed for products of combustion.
Alarm Signal
A signal indicating an emergency requiring immediate action, such as a fire alarm signal.
Alarm Verification
A feature of some automatic fire detection and alarm systems to reduce unwanted alarms. Smoke detectors must report alarm conditions for a minimum period of time, or confirm alarm conditions within a given time period after being reset, to be accepted as a valid alarm indicating signal.
Analog Device/Sensor
An initiating device that transmits a signal indicating varying degrees of condition, such as smoke obscuration level. As contrasted with a conventional sensor which can only indicate an on / off condition.
Annunciator
A unit containing two or more indicator lamps, alphanumeric display, or other equivalent means in which each indication provides status information about a circuit, condition, or location.
Automatic Fire Detectors
A device designed to detect the presence of fire or the products of combustion. Including, but not limited to, heat detectors, smoke detectors, beam detectors.
Manual Call Point
A fire alarm device in which it is necessary to break a special frangible element in order to operate an alarm.
Bus
A connector module or interface for power distribution to and among appliances for a rigid conductor in an electric circuit used to connect three or more circuits.
CAD (Computer Aided Design)
Using computer software to draft or model an object or building for manufacturing or construction.
Central Station Fire Alarm System
A system or group of systems in which the operations of cicuits devices are transmitted automatically to, recorded in, maintained by, and supervised from a central station.
Control Panel
An electrical device which switches, buttons, lights, or displays, used to monitor and control other devices or equipment.
End of Line Device
A device such as a resistor or diode placed at the end of a class B circuit to maintain supervision.
End of Line Relay
A device used to supervise power (usually for 4 wire smoke detectors) and installed within or near the last device on an initiating circuit.
End User
The person or business that actually uses the fire alarm system.
EPROM
Erasable and Programmable Read Only Memory. An electronic chip used in many different security products that stores software instructions for performing various operations.
The withdrawal of occupants from a building.
Evacuation Evacuation Signal
Distinctive signal intended to be recognized by the occupants as requiring evacuation of the premises - Normally T3 pattern as per ISO8201
Exit Plan
Plan for the emergency evacuation of the premises.
Fire Alarm
A system that detects and reports a fire in the protected premises, detects and reports water flowing in a sprinkler system, or detects and reports dangerous conditions such as smoke or overheated materials that may combust spontanously.
Fire Alarm Control Panel
A system component that receives inputs from automatic and manual fire alarm devices and may supply power to detection devices and transponders or off premise transmitters. The control unit may also provide transfer of power to the notification appliances and transfer condition of relays or devices connected to the control unit. The fire alarm control panel can be a local unit or a master control unit.
Fire Rating
The classification indicating in time (hours), the ability of a structure or component to withstand fire conditions.
178 Sales and Support, Call: 1300 ADI ADI Current
Flow of electricity through a circuit over a period of time; current is measured in amperes.
DB (Decibel)
Logarithmic scale measuring the intensity of sounds (the sound pressure level); a 10 decibel (dB) increase represents in a doubling of sound level.
Display
The visual representation of output data other than the printed copy.
Fixed Temperature Sensor
A heat sensor that is triggered when a pre- determined temperature has been reached at the sensor.
Flame Detector
A sensor that sees the infrared, ultraviolet, or visible radiation caused by a fire.
Four Wire Smoke Detector
A smoke detector which initiates an alarm condition on two separate wires apart from the two wires that are for power.
Gate Valve
A sprinkler valve that opens by lifting a round or rectangular gate out of the path of the fluid. Gate valves are sometimes used for regulating flow, but many are not suited for that purpose, having been designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.
GND (Ground)
An electrical connection to the earth generally though a ground rod. Also a common return to a point of zero potential, such as metal chassis in radio equipment. Power systems grounding is that point where the neutral conductor, safety ground, and building ground are connected.
Ground Fault
An undesired path that allows current to flow in a ground conductor.
Ground Loop
A completed circuit between shielded pairs of a multiple pair created by random contact between shields. An undesirable circuit condition where interference is created by ground currents when grounds are connected at more then one point.
GUI (Graphical User Interface)
Technique used to display information on a television screen or other display device in order to make the operation of some equipment easier or provide enhanced functions.
Heat Detector
A device that detects abnormally high temperature or a rate of temperature increase.
Heat Sensor
A sensor that detects the heat generated by a fire.
Heating, Ventilation, Air Conditioning (HVAC) Alarm
A system that reports heating, ventilation, and air conditioning system problems, rather than life-threatening emergencies. Public emergency response or dispatch personnel are not normally contacted when these alarm systems detect a problem; protected property maintenance personnel tend to be notified by the monitoring facility.
High Temperature Sensor A sensor that detects a higher-than expected Technical Support, Call: 1800 220 345
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