How to Detect Smoke in Large Open Spaces with a Linear Beam Smoke Detector
Large open spaces create a special challenge for fire detection. In warehouses, shopping malls, large workshops, exhibition halls, hangars, archives, museums and power plants, smoke may spread over a wide area before reaching a traditional point-type smoke detector. High ceilings, long spans, open layouts and difficult maintenance access can make conventional smoke detector placement more complicated and costly.
For these applications, a linear beam smoke detector provides an effective solution. Instead of detecting smoke only at one small point, a beam smoke detector monitors smoke across a long optical path. When smoke enters the beam path, the received infrared signal is reduced. The detector analyzes this attenuation and generates a fire alarm when the smoke level reaches the alarm threshold.
ANWETECH AT-B01 Linear Beam Smoke Detector is designed for large, open and unobstructed spaces where wide-area smoke detection is required. It is an EN54-compliant and CE-certified reflective beam smoke detector for professional fire alarm system applications.
Why Smoke Detection Is Difficult in Large Open Spaces
Large buildings often have high ceilings and wide structural spans. In these areas, smoke may not immediately reach the ceiling or a point detector location. Airflow, roof shape, ventilation and building layout can also affect smoke movement.
In warehouses, smoke may spread above storage racks. In shopping malls and halls, open atriums and decorative ceilings can make detector positioning more difficult. In hangars and workshops, large equipment and high mounting positions may increase installation and maintenance work. In museums, archives and historic buildings, fire detection must also consider building appearance and installation limitations.
A linear beam smoke detector helps solve these problems by monitoring a long distance between the detector and reflector. This allows one detector group to cover a large open area when the beam path is properly designed and kept free from obstruction.
How a Reflective Beam Smoke Detector Works
A reflective beam smoke detector consists of a detector unit and a reflector. The detector sends an infrared beam toward the reflector and receives the reflected light. Under normal conditions, the transmitted and reflected beams are aligned on the same optical axis.
When smoke enters the detection area, the smoke particles scatter and attenuate the infrared beam. The detector’s internal CPU analyzes the change in received light intensity. When the attenuation reaches the preset alarm threshold, the detector enters fire alarm status, activates the buzzer and red indicator, and operates the fire alarm relay output.
This working principle makes beam smoke detection especially suitable for large spaces where smoke may appear before a fire develops.
ANWETECH AT-B01 for Large Open Space Fire Detection
ANWETECH AT-B01 is a reflective linear beam smoke detector with strong data acquisition, analysis and judgment capability. Through internal algorithms, it can compensate for changes in ambient conditions and determine fire alarm and fault conditions.
The product is suitable for large, open spaces without obstructions, including:
Shopping malls
Museums
Archives
Large workshops
Warehouses
Hangars
Power plants
Power stations
Historic buildings
Heritage conservation buildings
Halls and similar large buildings
For fire alarm projects, AT-B01 provides fire alarm and fault signal outputs, allowing connection to a fire alarm control system through input modules. It also supports RS485 communication for system integration requirements.
Key Features of ANWETECH AT-B01
5 m to 100 m monitoring distance
Reflective beam-type smoke detection
Integrated transmitter and receiver structure
Built-in 8 sensitivity levels
Fire alarm relay output, NO/NC selectable
Fault relay output, NO/NC selectable
RS485 communication interface
DC 24 V power input, DC 18–30 V input range
Built-in laser module for fast reflector aiming
Red, yellow and green LED status indication
Audible buzzer for alarm and commissioning guidance
Automatic light compensation
Strong resistance to stray and scattered light interference
Fault self-diagnosis and dynamic adaptation to site environment
IP53 ingress protection
EN54-compliant and CE-certified product design
These features make AT-B01 a practical choice for contractors, fire alarm system integrators, MEP companies and project engineers working on large building fire detection systems.
Installation Design Considerations
Correct installation is critical for beam smoke detector performance. For AT-B01, the detector and reflector should be installed at the same horizontal level. The beam path should be clear and should not be blocked by fixed objects, moving objects, structural elements, birds or temporary site materials.
For project design, the detector beam axis should normally be installed 0.3 m to 1.0 m below the ceiling. The mounting height from the ground should not exceed 20 m. The distance between detector and reflector should not exceed 100 m, and the optical axis should remain free from obstructions and interference sources within 1 m.
Reflector selection should also follow the detection distance. When the distance is within 50 m, two reflector blocks are used. When the distance is from 50 m to 100 m, four reflector blocks are used, depending on actual site conditions. The reflector blocks should be installed closely on the same plane without gaps.
These installation requirements help ensure stable optical alignment and reliable smoke detection in real project environments.
Commissioning with Built-In Laser Aiming
Commissioning is one of the most important steps for any beam smoke detector. AT-B01 includes a built-in laser module to help installers quickly aim the detector toward the reflector.
During commissioning, the detector is powered on and the commissioning magnet is placed near the specified position for more than 8 seconds. The laser turns on, and the installer adjusts the detector angle until the laser spot points to the reflector. LED and buzzer indications help show whether the signal is weak or strong.
This design helps reduce commissioning time and makes installation more convenient for engineering teams, especially in high-ceiling buildings where accurate alignment is important.
Connection to Fire Alarm Control Systems
AT-B01 can be connected to a fire alarm control system through relay outputs and input modules. The fire alarm output and fault output are relay-type signals with NO/NC selectable settings. This allows flexible integration with different fire alarm panels or addressable input modules.
The detector terminal includes DC24V power input, fire alarm output, fault output and RS485 A/B communication terminals. The power input is non-polarized DC 18–30 V, which supports easier site wiring.
For fire alarm system design, the end-of-line resistor and module wiring should follow the requirements of the fire alarm control panel or system manufacturer.
Typical Applications
Warehouse Fire Detection
Warehouses often have large floor areas, high ceilings and long open spans. Beam smoke detectors can provide wide-area smoke monitoring while reducing the need for many point-type detectors in high mounting locations.
Shopping Mall and Hall Fire Detection
Shopping malls, atriums, public halls and exhibition areas require fire detection that can cover open spaces while keeping the installation clean and practical. A beam smoke detector can monitor long distances across open areas when the optical path is clear.
Workshop and Industrial Building Fire Detection
Large workshops and industrial facilities may contain production lines, large equipment and complex roof structures. AT-B01 can be used for early smoke detection in open workshop areas where conventional point detector layout is difficult.
Museum, Archive and Historic Building Fire Detection
Museums, archives and historic buildings need fire detection solutions that reduce unnecessary structural impact. Reflective beam smoke detection can support wide-area coverage with fewer visible detector points, depending on the building design.
Hangar and Large High-Ceiling Building Fire Detection
Aircraft hangars and similar high-ceiling buildings require long-distance detection coverage. A linear beam smoke detector is suitable for open spaces where the beam path can be maintained without obstruction.
Why Choose ANWETECH AT-B01
ANWETECH AT-B01 is designed for professional large-space fire detection projects. It combines long monitoring distance, relay output integration, RS485 communication, built-in laser aiming and automatic environmental compensation in one reflective beam detector.
For contractors and system integrators, the product helps simplify smoke detection design in large open buildings. For end users, it supports reliable fire alarm monitoring in spaces where ordinary point-type smoke detection may be difficult to arrange or maintain.
With EN54 compliance and CE certification, AT-B01 is suitable for international fire alarm projects that require recognized product documentation and professional engineering support.
