What is fire beam smoke detector?

What is fire beam smoke detector?

Views : 1761
Author : ASENWARE
Update time : 2022-05-13 17:35:32

What is fire beam smoke detector?

A beam smoke detector is a device that consists of transmitter/receiver unit and a reflector. It transmits beam of light in order to detect smoke across large areas, wherein smoke is naturally a sign of fire. Beam smoke detector works on the principle of light obscuration, where there is a transmitter that emits beam and a beam receiver. If the presence of the smoke disrupts a certain percentage of beam light of the transmitted light, it will send signal to the panel that there is a fire. Beam smoke detectors area commonly used in area wherein standard point smoke detectors are not economical or efficient to use. 
The composition of the fire beam smoke detector
\

Types Of Fire Beam Smoke Detector

1. First type Fire Beam Smoke Detector Consisting of receiver and transmitter unit. In normal state, light beams sent from transmitter reach the receiver unit. If the receiver did not receive enough light beams, it will trigger a general alarm. The distance between two units can be between 5-100 meters.

First type Fire Beam Smoke Detector

2.Second type Fire Beam Smoke Detector consists of reflector and a unit that works as both receiver and transmitter. In normal state, IR light beams sent from receiver-transmitter unit reflect from reflector and reaches the unit. In case of fire, smoke obstruct the IR light beams and some of light rays did not reach receiver-transmitter unit. If there are 4 reflectors, the distance between reflector and the unit can be between 40-100 meters. If there is 1 reflector, the distance between reflector and the unit can be between 8-40 meters.

Second type Fire Beam Smoke Detector

Fire Beam Smoke Detector Design Requirements

Many factors may affect the performance of smoke detectors of all types. The type and number of combustibles, the rate of fire growth, proximity of the detector to the fire, ventilation and environmental factors are all important that needs to be considered. 

1.Sensitivity

a.Detector’s sensitivity should be set within the parameters of the beam used on a given application, combined with the environmental conditions of the area.

2.Location and Spacing

a.On a flat, clear or unobstructed ceiling, the maximum range/distance covered by a beam detector should be 100m, or as per manufacturers recommendations. No point in the protected area should be more than 7.5m from the center line of the beam detector. This gives a maximum spacing between two beam detectors of 15m, and a maximum distance from a wall to a beam detector of 7.5m. 

3.Obstructions

a.Obstructions on or near the ceiling or on the walls of a protected area will affect smoke distribution, and thus need to be taken into consideration. If there are number of joist or structural beams in the protected area, the detector should be placed in parallel in the joists. It is a good practice to ensure that the spacing from the beam center line is applied to all objects.

4.Beam Blockage

a.Beam smoke detectors rely on a clear path between transmitter, receiver and/or reflector. If the beam of light is blocked, the detector will not be able to detect a fire on early stage. Care must be taken that the beam is not installed where it could be blocked on a normal condition of the area protected. If people are likely to be present in the protected area, the detector should be mounted to a minimum of 2.7m above floor level. This is to prevent a nuisance or false alarms.

Fire Beam Smoke Detector Testing And Commissioning

The normal means of testing beam detectors is to place an obstruction in the path of the beam to reduce the amount of received light below the detector threshold and will trigger a general alarm.

Fire Beam Smoke Detector Maintenance 

As dust builds upon a beam detector’s optical components, it will affect its sensitivity and will increase susceptibility of false alarms. It is advisable to periodically clean the detector transmitter/receiver lenses and reflector. The maintenance interval will be dependent on the protected area conditions: the dirtier the area the more frequent required in cleaning the devices.

Fire Beam Smoke Detector Application

Fire Beam smoke detectors are commonly used in warehouses as a cost-effective way of fire detection and protecting large open areas and inappropriate for outdoor applications. Environmental conditions such as temperature extremes, rain, snow, sleet, fog, and dew can affect with the proper operation of the detector and might cause false alarms. In addition, outdoor conditions make smoke behavior impossible to predict and will affect the detector’s response to fire.

Fire Beam Smoke Detector Proper Application

Related News
Read More >>
What is Fire Hose? What is Fire Hose?
Oct .13.2023
A fire hose is a highly pressurized hose that is used to bring water to the fire. It may also transport flame retardants. Fire hoses can be attached to either a fire engine or a fire hydrant, and the pressure is between 800 and 2000 kPa. For reasons of fire safety, it's quite important to have a fire hose inspection as well as all fire protection equipment tested.  If, during a fire emergency, the fire hose fails it could have disastrous results.
What is Water-proof Fire Alarm System? What is Water-proof Fire Alarm System?
Sep .15.2023
Waterproof Heat Detector
Fixed Temperature Waterproof Heat Detector, the detector uses a bi-metallic strip to sense temperature change, therefore consuming minimal standby current and providing high reliability.
The Detector is particularly suited to environments, which are exposed to high levels of condensation or are hosed down. The detector has a wide operating margin allowing it to respond to both slow and fast increases in temperature; it can also sense temperature reliably in a horizontal or vertical position.
Addressable Explosion-proof Fire Alarm System Introduction Addressable Explosion-proof Fire Alarm System Introduction
Aug .08.2023
The Explosion Proof range of products has been designed to provide protection against explosions and products to ensure that all major advantages of high-quality fire detection technology can be safely exploited in industrial and hazardous environments. Many difficult sites such as metal, paint, pipelines, chemical, pharmaceutical, oil refineries, and other installations are vulnerable to the risk of explosion. In order to protect the assets and people, they need special solutions for fast and reliable fire detection.
Emergency Lighting System Installation Guide Emergency Lighting System Installation Guide
Jul .20.2023
Emergency lighting system is divided into centralized controlling and non-centralized controlling type, or centralized power supply and non-centralized power supply type. This article talks about emergency lighting system, power supply, emergency light controller installation guide.