System Sensor 2251T Addressable Smoke Detector

The System Sensor 2251T is an intelligent addressable smoke detector designed to provide reliable early warning fire detection in commercial fire alarm systems. It uses an optical sensing chamber to detect airborne smoke particles and communicates detector status to compatible fire alarm control panels.

As an addressable device, the 2251T provides individual point identification, allowing the fire alarm system to pinpoint the exact detector in alarm or trouble. Its plug-in construction, visible LED indicators, and intelligent communication make it well suited for commercial life safety applications requiring accurate smoke detection and system supervision.

Product Functions

• Detects airborne smoke conditions
• Provides intelligent addressable smoke detection
• Reports alarm conditions to the fire alarm control panel
• Provides individual point identification
• Continuously monitors detector status
• Provides visual status and alarm indication
• Supports functional testing
• Supports remote annunciation
• Provides continuous device supervision
• Supports plug-in detector maintenance
• Provides commercial fire alarm integration

Smoke Detection Performance

The 2251T uses an optical sensing chamber designed to detect smoke particles produced by a wide range of fire conditions.

The detector continuously monitors the environment and communicates status information to the fire alarm control panel. This allows the system to evaluate smoke conditions and associate them with a specific programmed location.

Optical sensing is particularly effective for detecting visible smoke generated by smoldering and developing fires, making it suitable for general commercial fire protection applications.

Intelligent Communication

The System Sensor 2251T operates as an intelligent addressable detector on a compatible fire alarm signaling line circuit.

Each detector communicates individually with the control panel, allowing precise identification of the device reporting an alarm or abnormal condition. This improves response accuracy and simplifies system testing, inspection, troubleshooting, and maintenance.

Addressable communication also reduces ambiguity compared to conventional zone-based detection systems.

Addressing

The detector is assigned a unique address during installation so it can be identified by the fire alarm control panel.

This individual addressing allows technicians and operators to quickly locate the 2251T during alarm events, testing, maintenance, or replacement activities.

Proper addressing ensures accurate system mapping and reliable alarm reporting.

Status Indication

The System Sensor 2251T includes dual LED indicators designed for 360-degree visibility.

These LEDs provide local indication of communication status and alarm conditions, assisting technicians during commissioning, inspection, testing, and maintenance.

Where required, compatible remote LED annunciation devices may also be used for additional visibility.

Testing & Maintenance

The 2251T supports routine functional testing as part of scheduled fire alarm system maintenance.

Its plug-in design allows the detector head to be removed from the base without disturbing field wiring, simplifying inspection, cleaning, testing, or replacement.

Routine maintenance should include inspection of the sensing chamber and smoke entry points to ensure they are free from dust, debris, paint, or other contaminants that could affect performance.

Detector Base Options

The 2251T uses a separate plug-in mounting base that remains permanently wired in place.

Depending on the system configuration, compatible bases may provide standard mounting or additional features such as relay output, isolation capability, or other system functions.

The correct base type should always be verified for compatibility with the installed fire alarm control panel.

Physical & Environmental Information

The System Sensor 2251T features a low-profile housing designed for indoor commercial installations.

Its compact design provides a clean appearance while supporting easy installation and maintenance. Environmental conditions such as temperature, humidity, airflow, ceiling height, and spacing should follow manufacturer installation guidelines and applicable fire alarm codes.

Protection & Applications

Suitable for:

• Commercial Fire Alarm Systems
• Intelligent Addressable Fire Alarm Systems
• Open-Area Smoke Detection
• Office Buildings
• Hospitals
• Healthcare Facilities
• Schools and Universities
• Hotels
• Government Buildings
• Industrial Facilities
• Warehouses
• Retail Buildings
• Institutional Facilities
• Indoor Fire Detection
• Commercial Life Safety Systems

2251T Datasheet