System Sensor 2D51 Smoke Detector

The System Sensor 2D51 is a commercial smoke detector designed for use with compatible InnovairFlex® 4-wire duct smoke detector housings and approved pendant-mount applications. It utilizes a smoke sensing chamber to provide dependable smoke detection in HVAC duct systems and specialized air-handling installations.

The detector features a low-profile housing, dual status LEDs, plug-in installation, and built-in testing capabilities that simplify maintenance and servicing. This product is intended exclusively for commercial fire alarm installations.

Product Functions

• Detects airborne smoke
• Designed for duct smoke detection applications
• Supports pendant-mount installations
• Reports alarm conditions through compatible duct detector housings
• Dual LED status indication
• Magnetic functional testing
• Remote testing with compatible accessories
• Supports routine inspection and maintenance

Electrical & System Information

The 2D51 is designed for operation with compatible InnovairFlex D4P120 4-wire duct smoke detector power boards and B210LP detector bases. The detector head plugs directly into the base and communicates with the compatible duct detector assembly for alarm reporting and supervision.

Remote testing and reset functions are available when used with compatible RTS151, RTS151KEY, RTS2, or RTS2-AOS accessories.

Features

• Commercial smoke detector
• Low-profile design
• Photoelectric smoke sensing
• Plug-in detector head
• Dual blinking status LEDs
• Built-in magnetic test capability
• Test/Reset button compatibility
• Removable insect screen
• Low standby current
• Designed for duct detector applications

Mounting & Design

The 2D51 installs onto a B210LP detector base for use with compatible InnovairFlex duct smoke detector systems or approved pendant-mount applications. Its twist-lock detector head allows quick removal for inspection, cleaning, testing, and replacement without disturbing field wiring.

The detector is designed for mounting in standard electrical boxes when installed as specified by the manufacturer.

Protection & Applications

Suitable for:

• Commercial HVAC Systems
• Air Handling Units
• Mechanical Rooms
• Industrial Facilities
• Office Buildings
• Healthcare Facilities
• Educational Facilities
• Warehouses
• Commercial Properties

Compatibility

Compatible with:

• System Sensor InnovairFlex® D4P120 Power Board
• B210LP Detector Base
• RTS151 Remote Test Station
• RTS151KEY Remote Test Station
• RTS2 Remote Test Station
• RTS2-AOS Remote Test Station
• APA151 Remote Annunciator
• Compatible UL Listed Conventional Fire Alarm Control Panels

Always verify compatibility with the installed duct detector housing, detector base, control panel, and project requirements before installation.

Technical Specifications

Manufacturer: System Sensor

Parent Company: Honeywell

Model: 2D51

Product Type: Commercial Smoke Detector

Detection Method: Photoelectric Smoke Sensing

Application: Duct Smoke Detector / Pendant Mount

Compatible Base: B210LP

Compatible Housing: InnovairFlex® D4P120

Status Indicators: Dual LEDs

Testing: Magnetic Test and Remote Test Compatible

Operating Temperature: –4°F to 158°F (–20°C to 70°C)

Operating Humidity: 0%–95% RH Non-Condensing

Air Velocity: 0–4,000 ft/min (Application Dependent)

Height: 2.0 in.

Diameter: 4.1 in. Detector Head

Weight: 3.1 oz. (88 g)

Construction: Low-Profile Plug-In Design

Application: Indoor Commercial Fire Alarm Systems

Listings: UL 268A for compatible duct detector applications; verify product labeling and project requirements before installation.

Applications

The System Sensor 2D51 is designed for commercial fire alarm systems requiring dependable smoke detection within HVAC duct systems and approved pendant-mount applications. Typical installations include air handling units, mechanical rooms, commercial office buildings, hospitals, schools, industrial facilities, warehouses, and other commercial occupancies utilizing compatible InnovairFlex duct smoke detector assemblies.

2D51 Datasheet