Understand Projected Beam Smoke Detector technologyMayara
Have you ever heard of projected beam technology? Designed for spacious rooms, this type of device has a large coverage area and is capable of detecting smoke through optical lenses. Learn how this technology works to find out if a projected beam smoke detector is the optimal solution for your fire alarm system.
What is projected beam technology?
Project beam smoke detectors use a beam of light to detect smoke across large areas. The equipment consists of at least one light transmitter and one photosensitive receiver. Consequently, the receiver monitors the amount and frequency of light emitted, controlling any anomalies.
In the absence of smoke, light passes uninterrupted from the light transmitter to the receiver in a straight line. The transmitter activates to a sensitivity level based on a percentage of total obscuration. Therefore, when the smoke blocks a certain percentage of the light transmitted, a fire signal is activated.
The manufacturer sets the sensitivity of these detectors based on the length of the beam. When installing a beam smoke detector, it is crucial to ensure that this feature is appropriately calibrated, since the correct sensitivity minimizes the possibility of false alarms.
If a solid object blocks the beam, the receiver reads the pattern of the blockage. Since sudden and total obscuration of the light is not a typical smoke signature, the detector will interpret this as a trouble condition, not an alarm.
Types of projected beam smoke detectors
Like many other devices, projected beam smoke detectors have different features that are applicable to various situations. Check the main types of optical beam smoke detectors and their features below.
End to end smoke detectors
In this type of system, smoke detectors have a separate light transmitter and receiver. End to end smoke detectors are applicable in places where there is no possibility to install a wide area detector or locations where the aesthetics are critical, such as cultural and heritage sites.
These types of devices have two wavelengths of light, UV and IR. These wavelengths react differently to smoke but identically to other types of blockage, such as objects or bugs. Therefore, the use of two wavelengths of light will help to avoid possible false alarms.
Reflective smoke detectors
A reflective projected beam smoke detector has a light transmitter and a receiver on the same unit. The transmitter emits light off to a retroreflector and that’s how the light path builds up.
This device automatically aligns itself during installation and can compensate for changes in the optical path of the light beam over time. Both end to end systems and reflective systems can be motorized.
Where should I install beam smoke detectors?
Projected beam smoke detectors are perfect for spacious rooms, open areas, and high ceilings. These devices are mostly recommended for buildings where the installation of conventional smoke detectors is too expensive or restricted by the height of the room.
While spot-type smoke detectors have maximum coverage of 900 square feet, beam smoke detectors have a theoretical coverage of 19,800 square feet. Beam smoke detectors cover an area that would require a dozen or more spot-type detectors.
Warehouses, atriums, arenas, and churches are places where you can mainly find projected beam smoke detectors. Now that you know how this technology works, check out The Fire Alarm Supplier project beam smoke detectors. If you have any questions, we’ll be happy to help.