Product Overview
The Honeywell 51305890-175 is a high-performance Thermocouple (TC) Field Termination Assembly (FTA), part of Honeywell’s LLMUX2 product line, engineered exclusively for integration with Experion PKS (Process Knowledge System) and TDC 3000 distributed control systems (DCS). As a critical signal conditioning and termination component, it enables accurate, reliable temperature measurement by interfacing 16 independent thermocouple sensors to Experion Process Managers (xPM) and PMIO (Process Manager I/O) modules.
Designed to replace legacy LLMUX TC FTAs (e.g., 51401491-100, 51309223-125), this FTA addresses key limitations of older models by adopting solid-state technology (eliminating mercury-wetted relays) and enhancing diagnostic capabilities. It supports both local and remote Cold Junction Reference (CJR) configurations, making it versatile for diverse industrial installations—from new system deployments to retrofits of existing TDC 3000/Experion PKS infrastructure.
The 51305890-175 is CE-compliant and conformally coated, ensuring durability in harsh industrial environments such as oil & gas refineries, power plants, and chemical processing facilities. Its core function is to terminate, isolate, and condition thermocouple signals, converting them into digital data for real-time process monitoring and control via the Experion PKS/TDC 3000 network.
Key Features
Enhanced Signal Integrity & Measurement Accuracy
16 Fully Isolated Channels: Each thermocouple input features channel-to-channel, channel-to-Process Manager (PM), and channel-to-power supply isolation, eliminating cross-talk and common-mode voltage (CMV) interference. This isolation ensures accurate measurements even in electrically noisy industrial environments.
Per-Channel A/D Converters: Unlike legacy LLMUX FTAs with a single shared A/D converter, the 51305890-175 integrates 16 independent analog-to-digital converters (one per channel). This design reduces measurement latency and improves precision, with a resolution of 2 microvolts per bit for thermocouple signals.
Rapid Open Thermocouple Detection: Identifies open thermocouple circuits within 1 second—significantly faster than legacy models—enabling quick fault response and minimizing process disruption.
Flexible Cold Junction Reference (CJR) Options
Local CJR Support: Built-in cold junction reference for applications where thermocouples terminate directly at the FTA, ideal for compact installations or environments with stable ambient temperatures.
Remote CJR Compatibility: Can be configured with an external remote CJR (part number 51305902-175) for scenarios where thermocouples terminate at a remote marshalling panel. A dedicated jumper (JMP2) selects between “LOC” (local) and “REM” (remote) CJR modes, ensuring measurement accuracy at the point of thermocouple-to-copper wire transition.
Solid-State Reliability & Environmental Durability
Mercury-Free Design: Replaces legacy mercury-wetted relays with solid-state components, eliminating environmental hazards and reducing maintenance costs associated with relay wear.
Conformal Coating: The PCB (Printed Circuit Board) is conformally coated to resist moisture, dust, and chemical contaminants, enabling operation in harsh conditions (10–90% non-condensing humidity, 0–50°C operating temperature).
Hazardous Location Compatibility: Certified to CSA Class I, Division 2 (Groups A–D) and UL standards, making it suitable for installation in potentially explosive industrial environments when paired with an IP54-rated enclosure.
Advanced Diagnostics & Ease of Maintenance
On-Board LED Diagnostics: Features three LEDs (green, red, yellow) for real-time status monitoring:
Green: Power-on confirmation.
Red: Error conditions (e.g., checksum errors, firmware mismatch, remote CJR communication failure).
Yellow: Normal communication with the Input/Output Link Processor (IOLP) or active calibration.
Drop-In Replacement: Directly replaces legacy LLMUX TC FTAs without modifying existing wiring or system configurations. It retains the same mounting footprint and connector compatibility, reducing retrofit downtime.
Broad Thermocouple Compatibility
Supports all ANSI-specified thermocouple types, including Type J (-200 to +1200°C), K (-100 to +1370°C), E (-200 to +1000°C), T (-230 to +400°C), B (+100 to +1820°C), S (0 to +1700°C), R (0 to +1700°C), and Japan Type R' (0 to +1770°C). This flexibility accommodates diverse temperature measurement requirements across industries.
Technical Specifications
The Honeywell 51305890-175 is manufactured by Honeywell International Sàrl, classified as an LLMUX2 TC FTA for Experion PKS and TDC 3000 systems. It is optimized for thermocouple signal termination, isolation, and conditioning, ensuring accurate temperature data transmission to Process Managers.
Core Functional Specifications
Input Channels: 16 independent thermocouple inputs, fully isolated (channel-to-channel, channel-to-PM, channel-to-power).
Input Signal Range: Nominal: -20 to +100 mV DC (thermocouple); Maximum non-damaging input: -10 to +10 V DC.
Cold Junction Reference (CJR):
Local CJR: Integrated on-board, compensation range: -20 to +60°C, accuracy: ±0.5°C typical.
Remote CJR: Compatible with 51305902-175 (requires MU-KRCJ00 cable, max length 50 meters/164 feet).
Scan Rate: 1 second (fixed by IOLP).
Channel Bandwidth: 0 to 4.7 Hz (-3 dB), filtering out high-frequency noise.
Measurement Accuracy & Signal Conditioning
Gain Error: 0.050% full scale (max) for -20 to +100 mV range.
Resolution: 2 microvolts per bit (thermocouple inputs).
Temperature Stability: ±20 ppm per °C (max) for thermocouple inputs.
Long-Term Drift: 500 ppm (max) over operational lifespan.
Input Impedance: 1 MΩ (DC) for thermocouple channels.
Electrical & Isolation Specifications
Common-Mode Voltage (CMV): ±250 V DC/Vac rms (with respect to PM common, DC to 60 Hz).
Common-Mode Rejection Ratio (CMRR): 120 dB min (50/60 Hz, 1000 Ω source impedance).
Normal-Mode Rejection Ratio (NMRR): 60 dB min (50/60 Hz).
Power Supply: Derived from Experion PM/PMIO backplane; External 24 V DC nominal (15–30 V DC range), 160 mA current draw at 15 V DC.
Environmental & Mechanical Specifications
Operating Temperature: 0 to 50°C (32 to 122°F).
Storage Temperature: -40 to 80°C (-40 to 185°F).
Relative Humidity: 10–90% non-condensing (max operating temperature 40°C).
Mechanical Resistance:
Shock (operating): 30 g peak acceleration (11 ±1 ms pulse width).
Shock (non-operating): 50 g peak acceleration (11 ±1 ms pulse width).
Vibration: 0.5 g (10–60 Hz) or 0.1 inches displacement.
Dimensions: 63.5 mm (depth) × 124.46 mm (width) × 307.34 mm (length) (2.5 × 4.9 × 12.1 inches).
Weight: ~300 g (0.66 lbs) (typical, including connectors).
Compliance & Certifications
Regulatory: CE Mark (EU EMC Directive 89/336/EEC, Low Voltage Directive 2014/35/EU); UL Listed; CSA Certified.
Hazardous Locations: CSA Class I, Division 2 (Groups A–D); UL Class I, Division 2 (Groups A–D).
Environmental: Conformally coated (IPC-CC-830) for moisture/dust resistance.
Compatibility & Included Components
Compatible Systems: Experion PKS (Release 516+), TDC 3000, xPM Process Managers, PMIO modules.
Replaced Legacy Models: 51401491-100, 51401491-150, 51309223-125, 51309223-175 (local CJR); 51401573-100, 51309213-125 (remote CJR).
Included Parts: 1× 51305890-175 FTA, 4× 8-pin compression terminals (51190771-508), 1× 6-pin compression terminal (51195776-100) (for local CJR configurations); remote CJR configurations require additional 51305902-175 (remote CJR) and 51190771-404 (4-pin connectors).
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