Intelligent Addressable Long-Range Projected Optical Beam Smoke Detector

High-Volume Optical Clearance for Open Architectural Spaces

In expansive, high-ceiling spaces like airport terminals, stadium concourses, shipping warehouses, and historic hotel atriums, standard point smoke detectors are fundamentally impractical. If a fire breaks out on the ground floor of a 15-meter-high atrium, convective thermal currents cause the rising smoke to cool and spread out horizontally before it ever reaches the ceiling. This "thermal stratification" forms an invisible barrier that prevents smoke from entering a traditional point-detector chamber. Furthermore, servicing hundreds of point detectors on a high ceiling requires expensive scaffolding, scissor lifts, and operational downtime.

An Optical Beam Smoke Detector is the engineered solution for these large-volume zones. Operating on the principle of light obscuration, the system projects an invisible infrared light beam horizontally across the protected space, right below the structural roof line or along intermediate stratification levels.

The system utilizes a single combined Transmitter/Receiver unit mounted on one wall and a passive Reflector Target mounted on the opposite wall. The transmitter shoots a continuous, modulated infrared light beam across the open space to the reflector, which bounces the signal straight back to the receiver eye. Under normal conditions, the received light signal is stable at 100%.

When smoke enters the path of the beam, the airborne particles scatter and absorb the infrared light, causing a drop in the received signal intensity (obscuration). An internal microprocessor analyzes this signal drop over time. If the light level falls within a pre-programmed threshold—typically between 25% and 50% obscuration—for a set duration, the unit registers an emergency fire condition and alerts the central Fire Alarm Control Panel (FACP).

Advanced Automated Real-Time Tracking

To ensure operational stability, modern beam detectors incorporate intelligent auto-alignment features to counter structural movement:

• Motorized Self-Aligning Steering: Large industrial buildings naturally shift, expand, and contract due to temperature swings, solar heating, and heavy wind loads. A minute structural shift of just $1^{\circ}$ can cause a standard manual beam to miss its target entirely, triggering a false alarm or fault. Our premium units feature internal motorized steering loops. If the building shifts, the receiver eye tracks the reflector and automatically adjusts its horizontal and vertical alignment in real time to maintain a perfect lock.

• Building Movement Compensation: Dynamically compensates for gradual, slow-moving shifts in light intensity caused by dust accumulation on the lenses over months of operation, preventing "dirty detector" false alarms.

Key Performance Features

• Massive Coverage Footprint: A single beam unit covers a linear path from 5 meters up to 100 meters ($16\text{ to }328\text{ ft}$), protecting a horizontal area up to 14 meters wide, replacing up to a dozen standard point detectors.

• True Addressable Signaling Line Circuit (SLC) Integration: Connects directly to the main FACP via a two-wire supervised data loop, mapping a unique address for exact location pinpointing and remote diagnostic monitoring.

• Integrated Laser-Assisted Alignment: Outfitted with a built-in, low-power visible alignment laser that can be activated during initial commissioning, allowing field technicians to quickly target the opposite reflector across a dim or cavernous space.

• Dynamic Fault Differentiation: The internal logic easily differentiates between fire smoke and a solid obstruction (such as a crane or forklift blocking the beam path). If the light obscuration drops instantly to $\ge 90\%$, the unit identifies it as a physical block and triggers a localized "Trouble/Fault" signal rather than a false building-wide fire alarm.

• Low-Wire Ground-Level Controller: Features a separate, low-level remote control display panel connected to the high-level head unit via a simple data wire. This enables facilities teams to perform routine code testing, sensitivity adjustments, and reset procedures safely from the ground without climbing ladders.

Ideal Infrastructure Applications

• Commercial Airport Terminals & Rail Stations: Mounted high above passenger waiting areas and baggage handling concourses.

• Logistics Warehouses & Distribution Centers: Routed down long, narrow racking aisles where standard detectors would be blocked by inventory stacks.

• Historic Cathedrals & Glass Atriums: Providing discrete, code-compliant fire surveillance without disrupting architectural aesthetics or running miles of exposed conduit across decorative ceilings.

Technical Performance MatrixEngineering Metric ParameterIntelligent Motorized Beam ProfileCompact Static Beam ProfileSensing Technology CoreOptical Infrared Light ObscurationOptical Infrared Light ObscurationOperational Range Spectrum5 to 100 Meters ($16\text{ to }328\text{ ft}$) standard5 to 50 Meters ($16\text{ to }164\text{ ft}$) standardAlignment Adjustment LoopAutomatic Motorized Self-Aligning CoreManual Mechanical Optical Thumb-wheelsLateral Coverage WidthUp to 14.0 Meters ($46\text{ ft}$) per NFPA 72Up to 14.0 Meters ($46\text{ ft}$) per NFPA 72Obscuration Sensitivity Limits25% to 50% (User configurable in steps)25%, 35%, or 50% Fixed Selection SetsInput Supply Voltage15V DC to 32V DC SLC / 24V DC Aux Power15V DC to 32V DC SLC / 24V DC Aux PowerStandby Current Consumption$\le 17\text{ mA}$ during alignment cycles$\le 2\text{ mA}$ average baseline standbyCompliance CertificationsUL 268 Listed / EN 54-12 ComplianceUL 268 Listed / CE ApprovedStandard Procurement Package Components

• Intelligent Motorized Optical Beam Head Unit (Transmitter/Receiver Combo)

• High-Efficiency Prismatic Retro-Reflector Target Plate Grid ($100\text{mm} \times 100\text{mm}$)

• Ground-Level Digital Remote Control Interface Module with LCD Display

• Factory Universal Wall-Mount Bracket Hardware and Laser-Alignment Target Plate

• Optional System Add-ons: Anti-Condensation Internal Lens Heaters (for unheated humid warehouses), Long-Range Multi-Reflector Expansion Kits ($50\text{m}$ to $100\text{m}$ extensions), and Vandal-Proof Wire Guard Cages (Sold Separately)