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Johnson Controls JTW-BD-5951JC Intelligent Temperature Sensor Technical Guide
Overview
The Johnson Controls JTW-BD-5951JC is an advanced, addressable intelligent temperature sensor engineered to deliver precise thermal detection and rapid fire location data to emergency life safety systems. Outperforming conventional thermal switches, the 5951JC utilizes a high-precision thermistor coupled with sophisticated evaluation algorithms to detect fixed temperature thresholds at 57C(135F)
Supported by high-speed FlashScan® protocol architecture, this detector transmits reliable, real-time digital environmental values back to the fire alarm control panel (FACP), allowing the system to continuously monitor thermal trends, environmental thresholds, and device maintenance requirements.
Technical Specifications & Parameter Standards
| Technical Parameter | Specification Detail |
| Model Designation | JTW-BD-5951JC Intelligent Temperature Sensor |
| Fixed Temperature Alarm | 57C (135Ｆ) threshold |
| Sensing Technology | Advanced electronic thermistor with rate-of-rise algorithms |
| Communication Protocol | FlashScan high-speed digital protocol |
| Addressing Method | Rotary decimal address setting (Range: 1–159) |
| Electrical Wiring | Low-static-current, two-wire loop circuit |
| Visual Indicators | Dual 360° wide-view LEDs (Green flash during normal polling; Steady Red during alarm) |
| Housing Material | Flame-retardant engineered plastic with back-pressure seal |
| Wiring Terminals | SEMS screw terminals for fast, secure field termination |
Core Features & Operational Benefits
Sleek, Low-Profile Design: Engineered with a modern, slim aesthetic that blends seamlessly into commercial ceilings and architectural layouts.
Stable Communication: Features high signal-to-noise ratio and noise immunity, ensuring error-free data transmission over extended SLC loops.
Comprehensive Diagnostic & Testing Options: Supports remote controller testing, magnet-activated built-in test switches, walk-test address blinking, and optional remote indicator outputs (RA400Z).
Flexible Base Compatibility: Fully compatible with optional relay bases, isolator bases, or sounder/buzzer bases for specialized notification requirements.
Typical Industrial Applications
The JTW-BD-5951JC temperature sensor is trusted across diverse mission-critical environments:
Commercial Office Complexes: Ceiling-mounted thermal tracking in high-occupancy zones.
Industrial Warehouses & Logistics: Areas subject to dust or non-smoke particulate environments where thermal detectors prevent nuisance alarms.
Institutional & Educational Facilities: Reliable zone protection in schools, dormitories, and public spaces.
Mechanical & Utility Rooms: Monitoring spaces prone to rapid ambient temperature shifts.
Installation & Wiring Procedure
Site Preparation: Ensure the SLC loop is depressurized and de-energized. Select a ceiling location free from direct airflow obstructions or rapid thermal drafts.
Base Mounting: Secure the compatible intelligent detector base to an approved electrical box using structural mounting screws.
Field Wiring: Terminate incoming and outgoing two-wire loop conductors to the SEMS screw terminals, maintaining correct polarity.
Address Setting: Set the rotary decimal switches on the detector head to match the engineering design address (1 through 159).
Head Installation: Align the detector head into the base, twist clockwise until locked, and execute a system communication verification test from the FACP.
Related Part Numbers, System Compatibility & Wiring Accessories
When engineering or servicing addressable thermal detection loops, technicians frequently specify standardized mounting bases, interface modules, and wiring accessories to ensure robust loop continuity and precise zoning:
Johnson Controls B113-30: Standard intelligent detector base utilized for secure mechanical mounting and electrical termination of addressable sensors across commercial fire loops.
Johnson Controls 4683-TTM-1F: Specialized system interface accessory and module component deployed during complex field wiring, line isolation, or peripheral device configuration.
IGC249: System-compatible hardware component and loop accessory utilized to support clean cabling layouts and signal integrity in multi-zone fire protection installations.
If you require official engineering datasheets, system configuration support, or bulk procurement quotations for the JTW-BD-5951JC and its associated bases, please contact our technical support team.
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