Product Overview

The Yokogawa AAR145-S50 is a high-performance, multi-functional analog input module designed for the CENTUM VP Distributed Control System (DCS). This module serves as a universal interface for temperature and low-voltage signal acquisition, supporting Thermocouples (TC), Resistance Temperature Detectors (RTD), potentiometers (POT), and millivolt (mV) inputs. Engineered for mission-critical reliability, the AAR145-S50 provides 16 channels of fully isolated inputs to ensure precise data acquisition in complex industrial environments.

By utilizing high-grade galvanic isolation not only between the system and the field but also between individual channels, the module effectively eliminates crosstalk and ground loop interference. This makes it an essential component for high-accuracy thermal monitoring in sectors such as petrochemical refining, power generation, and specialized chemical processing.

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: AAR145-S50

• Input Types: Thermocouple (J, K, E, T, R, S, B, N), RTD (Pt100, JPt100), mV, and Potentiometer

• Number of Channels: 16 isolated channels

• Isolation Type: Channel-to-channel and channel-to-system isolation

• A/D Conversion Resolution: 16-bit

• Measurement Accuracy: Variable by sensor type (typically ±0.1% of span)

• Refresh Cycle: 100 ms per 16 channels

• Operating Temperature: -20 to 60°C

• Compliance: CE Marking, IEC 61010-1

• Weight: 0.26 kg

• Dimensions: 32.8 mm x 125 mm x 130 mm

• Origin: Japan

Key Technical Characteristics

• Universal Input Compatibility: Accommodates a broad spectrum of temperature sensors and voltage signals, reducing the variety of spare parts required for plant maintenance.

• Fault-Tolerant Redundancy: Fully supports dual-redundant configurations. When paired in a redundant node, the system ensures uninterrupted signal availability during hardware failures or maintenance.

• Hot-Swappable Architecture: Modules can be removed and replaced while the control system is powered and active, preventing process downtime during routine hardware upgrades.

• Advanced Diagnostics: Features localized LED indicators for each channel to provide immediate visual feedback on status and health, simplifying troubleshooting for field technicians.

• Integrated Signal Conditioning: Includes built-in linearization and reference junction compensation for thermocouples, ensuring that raw field data is accurately translated into engineering units.

• High Dielectric Strength: Designed to withstand significant electrical surges, protecting the sensitive internal DCS bus from field-side voltage spikes.