System Sensor 2D51 Smoke Detector

The System Sensor 2D51 is a low-profile plug-in photoelectric smoke detector engineered specifically for special application smoke detection within HVAC duct systems. This head is designed for seamless integration with the D4P120 power board and requires a B210LP detector base for proper field installation. Featuring a 24Vac/dc or 120Vac supply voltage range when used with the appropriate power module, the 2D51 utilizes advanced photoelectric sensing technology to detect smoke particles across a wide range of combustion types. Its low-profile design ensures a minimal footprint in tight mechanical spaces while maintaining high sensitivity and environmental stability. Technicians frequently spec the 2951 for duct smoke detector replacement projects where reliable airflow monitoring and fire life safety compliance are mandatory. This analog addressable sensor components provide stable performance in high-velocity environments, ensuring fewer nuisance alarms while maintaining commercial fire alarm system integrity.

• Broad Voltage Compatibility: Operates on 24Vac/dc or 120Vac when paired with the D4P120 board, allowing for flexible wiring in legacy and modern builds.
• Symmetrical Sensing: The photoelectric chamber is designed for 360-degree smoke entry, ensuring rapid response times regardless of air current direction.
• Simple Maintenance: The plug-in head design allows for quick removal and cleaning without disturbing the field wiring in the B210LP base.
• High Velocity Performance: Specifically tuned for air speeds typical in commercial ductwork, reducing false triggers caused by dust or pressure changes.
• Status Monitoring: Features built-in LED indicators to provide immediate visual confirmation of power, standby, or alarm states.

Is the 2D51 head compatible with standard 4-wire bases?
The 2D51 is specifically engineered for use with the B210LP base and the D4P120 power board. Always verify the base model before attempting installation to ensure terminal alignment and electrical integrity.

Can this detector be used in high-humidity HVAC environments?
While the 2D51 is robust, it is rated for non-condensing environments. In high-humidity applications, ensure the duct housing is properly sealed to prevent moisture accumulation on the sensing optics.

Does this unit require a separate power supply for the LED?
No, the LED is powered via the communication loop or the power board interface, depending on your specific panel configuration and base wiring.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.