The YOKOGAWA AAI141-H50 S2 is a high-performance analog input (AI) module developed by YOKOGAWA Electric Corporation specifically for industrial automation and process control applications. It is mainly designed for YOKOGAWA CENTUM VP and CS3000 distributed control systems (DCS). As a field-level I/O unit, it is typically installed in a Field Control Station (FCS) or remote I/O station, and is responsible for the high-precision conversion of analog signals from field instruments such as pressure transmitters, temperature sensors, and flow meters into digital signals. It provides reliable data sources for the controller's PID regulation, alarm detection, data logging, and subsequent process optimization. Featuring high density, high accuracy, high reliability, and intelligent diagnostics, it is widely used in various demanding continuous process industries.

Technical Specifications


Functions & Advantages
(1) High-Precision Acquisition & Strong Anti-Interference
(2) Intelligent Diagnostics & Easy Maintenance
(3) High-Density Design & Flexible Integration
(4) High Reliability & Wide Compatibility
With industrial-grade construction, the module features strong environmental adaptability, IP20 protection and 1500 Vrms isolation voltage, enhancing stability and service life in harsh conditions. Firmware S2 ensures full compatibility with Yokogawa CENTUM VP R6+ and CS3000 DCS for seamless integration with minimal retrofitting. It supports multiple standard analog signals and communication protocols, and works with pressure transmitters, temperature sensors, flow meters and other field instruments for various industries.

Applications
- Oil & Gas: Used in oil and gas field monitoring, refinery processes including atmospheric & vacuum distillation, catalytic cracking, hydrofining, etc. It collects key parameters such as hydrocarbon gas concentration, pressure, flow and temperature to ensure safe refining and transportation, and supports process optimization.
- Power: Applied in large combined cycle power plants (CCPP), nuclear power auxiliary systems and substations. It monitors signals including boiler feedwater flow, turbine vibration, condenser vacuum and equipment status, providing reliable data for system protection and operation.
- Chemical Industry: Used to detect key variables such as temperature, pressure and level in reactors during chemical production, enabling automated process control, preventing accidents, and supporting process optimization and quality management.
- Water Treatment: Monitors water quality indicators including pH, turbidity and dissolved oxygen, controls aeration, dosing and other treatment processes to ensure effluent compliance and environmental regulations.
- Pharmaceuticals: Precisely collects temperature, humidity, pressure and other data in pharmaceutical production environments to meet GMP (Good Manufacturing Practice) requirements and ensure traceability and stability of production processes.
- Food & Beverage: Real-time monitoring of temperature, pressure, flow and other parameters during production to ensure safety and hygiene standards, and improve automation and product quality.
- Steel & Metal Processing: Collects temperature, pressure and other signals from high-temperature furnaces as critical inputs for automation systems, enabling equipment condition monitoring and early warning to ensure stable production.
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