Technical Specifications Input Signal Type: Thermocouple signal, millivolt analog signal Input Voltage Range: ‑100 mV to +100 mV Input Impedance: Greater than 10 MΩ typical value Channel Isolation Voltage: 500 V RMS Transient Surge Suppression: 1500 V Operating Power Supply: 24 VDC from system backplane bus Communication Protocol: Proprietary 2 Mbps HDLC fieldbus for I/A Series system Operating Temperature: ‑40 ℃ to +70 ℃ Storage Temperature: ‑50 ℃ to +85 ℃ Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard single‑slot plug‑in module for Foxboro I/A Series rack Certifications: CE, UL, ATEX, IEC 61508 functional safety compliance
Functional Features Supports multi‑channel thermocouple and millivolt weak signal acquisition. Built‑in high‑precision cold‑junction compensation circuit for thermocouple temperature measurement. Hardware filtering for restraining industrial electromagnetic interference noise for weak signal. Channel‑to‑channel and field‑to‑backplane galvanic isolation. Built‑in comprehensive self‑diagnosis for channel open‑circuit, power supply and internal circuit faults. 
Application Scenarios Process industry distributed control system(DCS). Petrochemical plant furnace and reactor thermocouple temperature monitoring. Oil & gas processing facility temperature measurement loops.
Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel equipped with status LED indicators for power supply, channel fault and fieldbus communication. Field thermocouple signal terminals are arranged on module front side for convenient wiring and maintenance work.
Working Principle Field thermocouple or millivolt weak signals flow into module through front‑side terminal connectors. Hardware filter circuit eliminates high‑frequency interference noise. Isolation circuit completes electrical isolation between field circuit and module internal logic circuit. Signal conditioning circuit amplifies weak millivolt signal, cold‑junction compensation circuit compensates thermocouple reference‑junction temperature drift.
Installation Requirements Insert module into designated slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly complies with official system grounding specification. Thermocouple signal wiring shall adopt special thermocouple compensation cable, shielded twisted‑pair structure.
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