System Sensor 2W-B 2-Wire Smoke Detector

The System Sensor 2W-B is a commercial 2-wire smoke detector engineered for compatible conventional fire alarm systems. As part of the System Sensor i3 Series, it utilizes photoelectric smoke sensing with automatic drift compensation to provide dependable smoke detection while helping minimize nuisance alarms caused by dust accumulation and environmental changes.

Its low-profile housing, plug-in detector head, and dual-color LED indicators simplify installation, maintenance, and routine testing. This product is intended exclusively for commercial fire alarm installations.

Product Functions

• Detects airborne smoke
• Initiates alarm conditions through compatible fire alarm control panels
• Automatic drift compensation
• Continuous smoke monitoring
• Dual-color LED status indication
• Magnetic functional testing
• Maintenance notification with compatible modules
• Supports routine inspection and servicing

Electrical & System Information

The System Sensor 2W-B operates on compatible 2-wire conventional initiating device circuits with an operating voltage range of 8.5–35 VDC. Automatic drift compensation and smoothing algorithms continuously adjust detector sensitivity to maintain dependable operation over time.

When paired with the optional 2W-MOD2 maintenance module, the detector supports remote maintenance indication and loop testing from the fire alarm control panel without requiring individual detector testing.

Features

• Commercial 2-wire smoke detector
• Photoelectric smoke sensing
• Automatic drift compensation
• Plug-in detector head
• Dual-color LED indicators
• Built-in magnetic test feature
• Low-profile housing
• Removable insect screen
• Stop-Drop ‘N Lock™ installation
• Compatible with 2W-MOD2 maintenance module

Mounting & Design

The 2W-B includes an integrated mounting base compatible with 3½-inch and 4-inch octagonal boxes, single-gang boxes, and 4-inch square electrical boxes with plaster rings. It may also be mounted directly to drywall using the supplied anchors where permitted by applicable codes.

The plug-in detector head allows quick removal for cleaning, inspection, testing, or replacement without disturbing the installed field wiring.

Protection & Applications

Suitable for:

• Office Buildings
• Schools
• Hospitals
• Hotels
• Retail Stores
• Warehouses
• Government Buildings
• Apartment Buildings
• Commercial Properties

Compatibility

Compatible with:

• Conventional Fire Alarm Control Panels
• 2-Wire Initiating Device Circuits
• 2W-MOD2 Maintenance and Loop Test Module
• SENS-RDR Sensitivity Reader
• A77-AB2 Retrofit Adapter Bracket
• Compatible Conventional Fire Alarm Systems

Always verify compatibility with the installed fire alarm control panel, initiating device circuit, and project requirements before installation.

Technical Specifications

Manufacturer: System Sensor

Parent Company: Honeywell

Model: 2W-B

Series: i3 Series

Product Type: Commercial 2-Wire Smoke Detector

Detection Method: Photoelectric Smoke Sensing

Circuit Type: 2-Wire Conventional

Operating Voltage: 8.5–35 VDC

Maximum Ripple Voltage: 30%

Average Standby Current: 50 µA

Peak Standby Current: 100 µA

Maximum Alarm Current: 130 mA (Panel Limited)

Nominal Sensitivity: 2.5% Obscuration per Foot

Status Indicators: Dual-Color LEDs

Testing: Built-In Magnetic Test Capability

Mounting: Integrated Plug-In Base

Operating Temperature: 32°F to 100°F (0°C to 38°C)

Operating Humidity: Up to 95% RH Non-Condensing

Application: Indoor Commercial Fire Alarm Systems

Listings: UL 268, ULC (Canadian models), FM Approved, CSFM, MEA, and additional regional approvals where applicable. Verify product labeling for the intended installation.

Applications

The System Sensor 2W-B is designed for commercial fire alarm systems requiring dependable smoke detection on conventional two-wire initiating device circuits. Typical applications include offices, schools, hospitals, hotels, apartment buildings, retail stores, warehouses, government facilities, and other commercial occupancies where conventional smoke detection is specified.

2W-B Datasheet