System Sensor 2WT-B Photoelectric i3 Series Smoke and Heat Detector, 2-Wire, 135F Fixed Thermal Sensor, White

Protect occupants and property with a reliable, easy-to-maintain combination detector built for commercial environments. The System Sensor i3 2WT-B is a 2-wire photoelectric smoke and heat detector that combines optical sensing with a 135°F fixed thermal sensor to detect both smoldering and fast-burning fires while minimizing nuisance alarms. Its plug-in design and included mounting base let technicians pre-wire ceilings and complete installs quickly with Stop-Drop ’N Lock convenience, improving install efficiency for contractors and facility teams.

Designed for security, fire protection, and building monitoring applications, the 2WT-B offers wide-angle dual-color LEDs, remote maintenance signaling, drift compensation, and an 85 dB sounder for clear local notification. The detector’s 24V DC compatibility and in-line terminals make integration with conventional panels straightforward, while removable covers and simplified sensitivity measurement reduce service time and lifecycle costs. Ideal for schools, offices, retail, and mixed-use facilities, the System Sensor i3 2WT-B delivers dependable life-safety performance and easier maintenance. Contact your distributor to specify this combination detector for your next security or fire monitoring project.

• Fast, plug-and-play installation with included plug-in base reduces labor time and downtime
• Dual-sensor protection (photoelectric + 135°F fixed thermal) minimizes nuisance alarms while improving fire detection accuracy
• Remote maintenance signaling and wide-angle dual-color LEDs simplify monitoring, testing, and code compliance checks
• Robust 2‑wire design and 24V DC compatibility integrate easily with existing commercial security and fire systems
• Removable chamber and drift compensation lower long-term service costs and extend reliable operation