System Sensor 4WT-B 4-Wire Photoelectric Smoke Detector with 135° Thermal Sensor

Overview

The System Sensor 4WT-B combines dependable four-wire power with advanced sensing to support reliable smoke detection in commercial settings. It uses a photoelectric detection method complemented by a 135-degree fixed thermal sensor to respond to different fire scenarios. The unit is designed for standalone operation with a visual alert and a straightforward maintenance path.

What makes it fit for purpose

With 12/24 VDC power supplied through a four-wire connection, this detector emphasizes reliability in installations where a single power source and consistent signaling are preferred. Note that it does not include battery backup and does not support interconnection with other detectors, making it well-suited for direct, dedicated monitoring zones.

• Photoelectric smoke detection for rapid response to smoldering fires
• 135-degree fixed thermal sensor adds a heat sensing layer for challenging environments
• Removable detector cover and chamber simplify field service and maintenance

Beyond sensing, the 4WT-B includes built-in remote maintenance signaling to help facilities teams verify status without opening cabinets. Drift compensation and smoothing algorithms contribute to stable operation across temperature and environmental changes.

• Visual alert: Red LED signals during alarm and status changes
• Operating temperature range of 32 to 120 degrees Fahrenheit supports use in typical indoor spaces
• UL and CSFM listings indicate compliance with industry standards

Size and fit are straightforward: the detector measures roughly two inches tall with a compact diameter of about 5-19/64 inches, and shipping includes the mounting base for quick installation. The removable cover and chamber enable efficient field checks and replacements without large disassembly.

Real-life use scenarios include offices, schools, laboratories, and other non-residential environments where dedicated detection is preferred and where a reliable four-wire power layout is already in place. The combination of photoelectric sensing and a thermal sensor offers flexibility in detecting different fire signatures, while the signal options provide clear maintenance visibility for building operators.