Product Details: Foxboro 84S-TO2TJRF-LMN Smart Temperature Transmitter
1. Product Overview
The Foxboro 84S-TO2TJRF-LMN is a high-precision smart temperature transmitter under Schneider Electric’s Foxboro brand, engineered for reliable temperature measurement and signal conditioning in industrial process control systems. As part of the Foxboro 84S series—renowned for ruggedness and accuracy—it is specifically designed to interface with thermocouple (TC) and resistance temperature detector (RTD) sensors, converting low-level temperature signals into standardized 4-20 mA analog outputs or digital signals (via HART/Foundation Fieldbus).
This transmitter eliminates signal degradation from long sensor wiring by performing local signal amplification and linearization, ensuring precise temperature data transmission to DCS (Distributed Control Systems) or PLCs (Programmable Logic Controllers). Its compact, field-mountable design and wide operating temperature range make it suitable for harsh environments in oil & gas, chemical processing, power generation, and pharmaceutical industries. With built-in self-diagnostics and remote configuration capabilities, it reduces maintenance costs and minimizes process downtime—aligning with Schneider Electric’s commitment to industrial operational efficiency.
2. Key Technical Specifications
3. Core Features
- Dual-Input Flexibility: Supports both thermocouple (TC) and RTD sensors, allowing users to switch between sensor types without replacing the transmitter—reducing inventory costs and simplifying system upgrades. The 3-wire/4-wire RTD compatibility ensures high accuracy for low-temperature measurements (e.g., pharmaceutical refrigeration), while TC support covers high-temperature processes (e.g., chemical reactors).
- High-Precision Measurement: Delivers ±0.05% span accuracy for RTD inputs, enabled by advanced signal conditioning and linearization algorithms. Built-in cold junction compensation (CJC) eliminates TC measurement errors caused by ambient temperature fluctuations, critical for processes requiring tight temperature control (e.g., food & beverage pasteurization).
- Rugged Industrial Design: IP66/IP67-rated housing protects against dust, water ingress, and harsh chemicals, making it suitable for outdoor or wet environments (e.g., offshore oil platforms, wastewater treatment plants). The wide operating temperature range (-40°C to +85°C) ensures reliable performance in extreme climates.
- Smart Digital Connectivity: HART 7.0 compatibility enables remote configuration, calibration, and diagnostics—eliminating the need for on-site visits to adjust parameters (e.g., span, units, alarm thresholds). Digital data transmission coexists with the 4-20 mA analog signal, allowing seamless integration with legacy DCS systems while supporting future digitalization.
- Enhanced Diagnostics & Reliability: Real-time fault detection (sensor open/short, overrange) triggers visual alerts (LED indicators) and HART status messages, enabling predictive maintenance. The loop-powered design reduces wiring complexity and ensures continuous operation even during temporary power fluctuations.
4. Application Scenarios
- Oil & Gas: Measures temperature in crude oil pipelines, refinery distillation columns, and wellhead equipment. Resists corrosion from hydrocarbons and withstands high-pressure environments, ensuring accurate data for process optimization and safety.
- Chemical Processing: Monitors reactor temperatures, heat exchangers, and storage tanks. The dual-input capability supports switching between TC (for high-temperature reactions) and RTD (for low-temperature chemical storage), adapting to diverse process stages.
- Power Generation: Tracks temperature in steam turbines, boiler tubes, and generator windings. High accuracy and fast response times help prevent equipment overheating and ensure compliance with power grid safety standards.
- Pharmaceuticals: Controls temperature in fermentation tanks, lyophilizers (freeze dryers), and cleanrooms. Complies with FDA 21 CFR Part 11 via audit trails (HART data logging) and ensures temperature stability for drug manufacturing.
- Food & Beverage: Maintains temperature in pasteurization lines, refrigerated storage, and baking ovens. The transmitter’s hygienic design (compatible with washdown procedures) and accurate CJC support meet strict food safety regulations.
5. Installation & Configuration Notes
- Mounting Options: Field-mount (on sensor junction boxes) or pipe-mount (via optional bracket) installation. Ensure the housing is oriented to prevent water pooling (IP67 compliance) and maintain at least 100 mm clearance from high-voltage cables to avoid electromagnetic interference (EMI).
- Wiring Guidelines: Use shielded twisted-pair cables for sensor inputs (TC/RTD) to minimize noise. For 4-20 mA loop wiring, ensure polarity is correct (positive terminal to DCS output, negative to ground) to avoid damage. RTD 4-wire configuration is recommended for maximum accuracy in long-distance installations.
- Connect a HART communicator (e.g., Rosemount 475) to the transmitter’s loop terminals.
- Select sensor type (TC/RTD) and input range via the communicator’s menu.
- Calibrate zero/span using a precision temperature reference (e.g., dry-block calibrator).
- Enable diagnostic alerts (e.g., sensor open) and set HART polling address for integration with DCS.
- Maintenance Recommendations: Perform annual calibration using a NIST-traceable temperature source. Check wiring connections quarterly for corrosion (especially in humid environments) and clean the housing with a dry cloth to remove dust/debris.
6. Quality & Warranty
- Certifications: Complies with IEC 61298-1 (process measurement transmitters), ANSI/ISA-50.00.01 (electrical standards), ATEX (hazardous areas: Zone 0/1/2 for gas, Zone 21/22 for dust), and CE marking (EU). Meets FDA 21 CFR Part 11 requirements for pharmaceutical applications.
- Warranty Period: 36 months from the date of delivery (covers manufacturing defects; excludes damage from improper installation, sensor mismatch, or exposure to conditions beyond specifications).
7. Ordering Information
- Standard Package Includes: 1×84S-TO2TJRF-LMN transmitter, 1×installation manual (English), 1×wiring diagram, 2×mounting screws, 1×calibration certificate (NIST-traceable).
- Required Accessories: Temperature sensor (e.g., Foxboro J-type TC or Pt100 RTD), shielded cables (22 AWG minimum), HART communicator (for configuration), pipe-mount bracket (optional, part number 84S-BRK-PIPE).
- Related Products: Foxboro I/A Series DCS (for centralized monitoring), Schneider Electric EcoStruxure Asset Advisor (for predictive maintenance), Foxboro 873EC pressure transmitter (for combined temperature-pressure monitoring).
