System Sensor 2WTA-B Smoke Detector

The System Sensor 2WTA-B is a commercial two wire smoke detector designed to provide reliable smoke and fixed temperature heat detection with an integrated audible sounder. As part of the i3 Series, it combines advanced smoke sensing, thermal detection, and intelligent maintenance features to provide dependable fire detection while reducing nuisance alarms.

The detector incorporates drift compensation, automatic sensitivity adjustment, dual color LED indication, and a plug in design for simplified installation and maintenance. Its built in sounder provides local audible notification when an alarm condition occurs, making it suitable for a wide range of commercial and residential fire alarm applications.

Product Functions

• Detects smoke using photoelectric sensing technology
• Detects fixed temperature heat conditions
• Activates an integrated audible sounder
• Reports alarm conditions to the fire alarm control panel
• Performs automatic drift compensation
• Continuously monitors detector sensitivity
• Provides maintenance indication
• Supports remote maintenance signaling
• Supports loop testing
• Provides visual status indication through dual LEDs

Electrical & System Information

The 2WTA-B operates on a nominal 12 volt or 24 volt two wire notification circuit with an operating voltage range of 8.5 to 35 VDC. It incorporates automatic drift compensation and smoothing algorithms that continuously adjust detector sensitivity to maintain reliable performance over time.

Dual color LEDs provide visual indication for power up, standby, alarm, maintenance, out of sensitivity, and freeze trouble conditions. The detector includes a built in sounder and a fixed 135 degree Fahrenheit thermal sensor for additional fire detection capability.

Features

• Smoke detector
• Built in sounder
• Fixed temperature thermal sensor
• Two wire operation
• Photoelectric smoke sensing
• Automatic drift compensation
• Automatic sensitivity adjustment
• Dual color LED indicators
• Plug in installation
• Low profile design
• Maintenance indication
• Loop testing capability
• Remote maintenance signaling
• Commercial fire alarm application

Mounting & Design

The 2WTA-B features a plug in detector head and mounting base that simplify installation and servicing. The base may be prewired before the detector is installed, reducing installation time while minimizing wiring disturbances during maintenance.

The detector is compatible with standard three and one half inch and four inch octagonal boxes, single gang boxes, four inch square boxes with plaster rings, and direct ceiling mounting using approved anchors.

Protection & Applications

Suitable for:

• Commercial Fire Alarm Systems
• Apartment Buildings
• Hotels
• Dormitories
• Office Buildings
• Healthcare Facilities
• Assisted Living Facilities
• Schools and Universities
• Retail Buildings
• Residential Occupancies
• Mixed Use Buildings
• Indoor Fire Detection

Technical Specifications

Manufacturer: System Sensor

Parent Company: Honeywell

Model: 2WTA-B

Series: i3 Series

Product Type: Smoke Detector

Detection Method: Photoelectric Smoke Sensing with Fixed Temperature Thermal Sensor

Thermal Rating: 135 Degrees Fahrenheit 57.2 Degrees Celsius

Operating Voltage: 8.5 to 35 VDC

Wiring: Two Wire

Standby Current: 50 Microamps Average

Maximum Alarm Current: 130 Milliamps Limited by Control Panel

Sounder Output: Built In 85 dBA at 10 Feet

Status Indicators: Dual Color LEDs

Sensitivity: 2.5 Percent Per Foot Nominal

Operating Temperature: 32 Degrees Fahrenheit to 100 Degrees Fahrenheit

Relative Humidity: 0 Percent to 95 Percent Non Condensing

Mounting: Plug In Base

Application: Indoor Commercial Fire Alarm Systems

Listings: UL Listed, FM Approved, and CSFM Listed. Verify product labeling, local codes, and project requirements before installation.

Applications

The System Sensor 2WTA-B is designed for commercial and residential fire alarm systems requiring two wire smoke detection with integrated local audible notification and fixed temperature heat detection. Typical applications include apartment buildings, hotels, dormitories, assisted living facilities, office buildings, schools, healthcare facilities, retail spaces, and other occupancies requiring dependable smoke detection with an integrated sounder.

Download the Specification sheet in *.pdf format