Product Overview

The ABB AI950S, designated by part number 3KDE175521L9500, is a specialized intrinsically safe analog input module developed for the S900 remote I/O system. This TI4-Ex module is specifically engineered to interface with temperature sensors located in hazardous areas (Ex-zones), providing a secure and highly accurate data bridge to the Distributed Control System (DCS). By supporting multiple sensor types including Resistance Temperature Detectors (RTDs) and Thermocouples, the AI950S ensures precise thermal monitoring while maintaining strict galvanic isolation. Its Swedish-engineered design focuses on high-resolution signal conversion and extreme environmental resilience, making it a critical component for safety-oriented process automation.

Module Specifications and Physical Assets

• Model Number AI950S

• Order Reference 3KDE175521L9500

• Input Type 4-channel Temperature Input (TI4-Ex)

• Intrinsically Safe Yes, designed for Zone 1 and Zone 2 deployment

• Compatibility S900 I/O System / DCS Integration

• Net Weight 0.12 kg

• Form Factor 2.0 cm x 10.5 cm x 11.0 cm

• Resolution High-bit A/D conversion for micro-degree sensitivity

• Communication Interface Fieldbus connection via S900 station redundant links

• HS Code 8537101190

• Country of Origin Sweden

Strategic Industrial Implementations

The AI950S 3KDE175521L9500 is primarily deployed in high-risk environments where thermal stability is paramount to operational safety:

Petrochemical and Refinery ProcessingMonitoring reactor temperatures and distillation column profiles in explosive atmospheres where intrinsically safe (Ex) protection is legally mandated.

Pharmaceutical FermentationProviding precise thermal feedback for delicate biological processes, ensuring batch consistency through high-accuracy RTD signal processing.

Oil and Gas Storage MonitoringManaging tank farm temperature telemetry to prevent overpressure scenarios and ensure safe fluid storage in volatile conditions.

Chemical Batch RegulationInterfacing with multi-type thermocouples to monitor exothermic reactions, allowing the DCS to perform real-time cooling adjustments with zero latency.

Cryogenic and Thermal StorageExecuting reliable data collection in extreme low or high-temperature environments, benefiting from the module's wide operating temperature tolerance.