1. Product Description

AAT141‑S00 S2 is a high‑precision hot‑swappable temperature and millivolt analog‑input module developed by Yokogawa for the CENTUM‑VP distributed‑control‑system platform. It provides 16 fully‑galvanic‑isolated input channels, each channel can be independently configured to receive thermocouple signals (J, K, E, B, R, S, T, N) or low‑level millivolt signals (-100~150mV, -20~80mV) from field sensors. With built‑in cold‑junction compensation, burnout detection, high‑resolution A/D conversion circuits and 1500V AC channel‑to‑system isolation protection, it effectively suppresses ground‑loop interference. The S2 revision version adopts pressure‑clamp terminal connection interface, communicates with the FCS controller via ESB back‑plane bus, supports dual‑redundant rack installation, and can run continuously and stably within -20℃~+70℃ for long‑term unattended temperature‑monitoring tasks in process‑industry control cabinets.

2. Core Product Functions

• Collect thermocouple temperature signals and millivolt weak‑voltage signals from field temperature‑measuring sensors
• Convert low‑level analog mV signals into high‑precision digital temperature‑data readable by DCS controllers
• Built‑in automatic cold‑junction compensation to eliminate temperature‑measurement error at cabinet‑side terminals
• Independent galvanic isolation for every channel to block electromagnetic noise and prevent surge damage to DCS rack hardware
• Burn‑out detection function, triggering an alarm when thermocouple sensor wires break off
• Support hot‑swap replacement and dual‑redundant configuration to avoid process interruption during module maintenance
• Real‑time self‑diagnosis for channel open‑circuit, over‑range input, back‑plane communication and power‑supply faults
• Upload real‑time temperature‑sampling values and fault‑alarm information to operator HMI and upper SCADA monitoring system

3. Application Scenarios

• Thermal‑power‑plant boiler furnace, superheater and steam‑turbine metal‑wall temperature monitoring DCS racks
• Petrochemical refinery heating‑furnace, reactor and distillation‑column multi‑point temperature‑acquisition cabinets
• Chemical plant high‑temperature reaction‑kettle, heat‑exchanger and pipeline temperature‑monitoring control panels
• Metallurgical sintering‑furnace, cement rotary‑kiln and glass‑furnace multi‑point temperature‑measurement stations
• Waste‑incineration‑power‑generation flue‑gas and combustion‑chamber temperature‑data‑collection control cabinets
• Food‑processing and pharmaceutical‑industry high‑temperature sterilization‑process closed‑loop temperature‑monitoring nodes

4. Common Problems & Troubleshooting