D296/D297 Series Application Guide 3
1.0 Scope
This application guide is intended to assist in determining the best locations and applications of the D296 Series Long Range Beam
Smoke Detectors.
This application guide contains information from the National Fire Protection Association standard NFPA-72, the National Fire Alarm
Code, on automatic fire detectors and discusses the general application rules for the D296 Series.
Your Local Authority Having Jurisdiction (AHJ) should always be consulted before beginning the installation of any fire
alarm system.
2.0 Glossary of Terms
Beam Smoke Detector (Projected Beam Smoke Detector)
A device which senses smoke or smoke and heat by projecting a light beam from
a transmitter across the protected area to a receiver that monitors the light signal.
Smoke and/or heat entering the beam path will decrease the light signal causing an alarm.
Detector Coverage
The area in which a smoke detector or heat detector is considered to effectively
sense smoke and/or heat. This area is limited by applicable listings and codes.
Listed
The inclusion of a device in a list published by a recognized testing organization,
indicating that the device has been successfully tested to meet the accepted standards.
Obscuration
The reduction of the ability of light to travel from one point to another due to
the presence of solids, liquids, gases, or aerosols.
Receiver
The device, in a projected beam smoke detector system, which monitors the
signal level of the light which is sent by the transmitter.
Sensitivity
The ability of a smoke detector to respond to a given level of smoke.
Smoke
The solid and gaseous airborne products of combustion.
Spot-Type Detector
A device which senses smoke and/or heat at its location only. Spot-type detectors
have a defined area of coverage.
Stratification
The effect which occurs when smoke, which is hotter than the surrounding
air, rises until equal to the temperature of the surrounding air, causing the smoke to stop rising.
Transmitter
The device in a projected beam smoke detector which projects the light across the protected area to its associated receiver.
Trouble Condition
The status of a device or system which impairs its proper operation, i.e.,
open circuit on an initiation loop. The notification of a trouble condition indicated
on a control panel or annunciator is a “TROUBLE” SIGNAL.
NFPA 72®,
National Fire Alarm Code® are registered trademarks of the National Fire Protection Association.