Bosch D296 Application Manual page 10

D296/D297 | Application Guide | 4.0
4.0 Glossary
Table 1: Glossary
Term Definition
beam smoke A device such as the D296/D297 Series Projected Beam Smoke Detectors that senses smoke or smoke
detector and visible heat waves by projecting a light beam from a transmitter across the protected area to a receiver
that monitors the light signal.
Smoke, visible heat waves, or both entering the beam path decrease the light signal causing an alarm.
detector An area in which a projected beam smoke detector effectively senses smoke. This area is limited by
coverage applicable listings and codes.
obscuration The reduction of light's ability to travel from one point to another due to the presence of solids, liquids,
gases, or aerosols.
range The distance between the transmitter and receiver. Also known as beam length.
receiver A device, in a projected beam smoke detector system, that monitors the signal level of the infrared light
sent by the transmitter.
sensitivity The ability of a projected beam smoke detector to respond to a given level of smoke.
sidewall A wall parallel to the beam's path of travel.
spacing The distance between projected beam smoke detector receiver and transmitter pairs.
spot-type A device that senses smoke, heat, or both only at the detector's location. These detectors have a defined
detector area of coverage.
stratification An effect that occurs when air containing smoke particles or gaseous combustion products is heated by
smoldering or burning material. The air becomes less dense than the surrounding cooler air and rises until
it reaches a level at which there is no longer a difference in temperature between it and the surrounding
air. Stratification can also be caused by forced ventilation.
transmitter A device in a projected beam smoke detector that projects the infrared light across the protected area to
its associated receiver.
trouble A service condition that needs to be corrected, such as a broken wire, dirty detector, misaligned detector,
and so on.
5.0 Accessories
Table 2: Accessories
Product Description
Standard
D306 Remote Monitors the status condition of the detector and allows the user to measure a
Indicator Plate calibration voltage to determine if the detector is within the calibration range. Can be
mounted on a standard single-gang box.
Optional
D307 Remote Monitors the condition of the beam smoke detector and allows the user to measure a
Test/Indicator calibration voltage to determine if the detector is within the calibration range. Use a
Plate Keylock switch to perform a remote test and detector reset. Can be mounted on a
standard double-gang box.
D309 Alignment Provides a visual indication to help align the D296/D297 Series transmitter and
Strobe receiver.
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Glossary
Bosch Security Systems, Inc. | 01/07 | F01U500951-01