AAR181-S50 Yokogawa RTD Input Module 12-Channel

Yokogawa AAR181-S50 – 12-Channel Isolated RTD Input Module

Technical Specifications

• Manufacturer: Yokogawa Electric Corporation
• Model: AAR181-S50
• Product Type: RTD Input Module (Isolated)
• Number of Input Channels: 12 isolated channels (CH1 to CH12)
• Input Signal Type: RTD Pt100 (3-wire type)
• Applicable Standards: JIS C1604:1997 and IEC751:1995
• Allowable Input Voltage: ±5 V (maximum input range)
• Withstanding Voltage: 1500 V AC for 1 minute between input and system
• Input Resistance (Power ON): 2 MΩ or larger
• Input Resistance (Power OFF): 2 MΩ or larger
• Accuracy (RTD): ±120 mΩ
• Allowable Total Wiring Resistance: 40 Ω or less per wire
• Measurement Current (RTD): 1 mA (constant current excitation)
• Temperature Drift: ±120 mΩ / 10 °C for RTD input
• Data Update Period: 1 second (fixed cycle)
• Burn-out Detection: Configurable per module (UP/DOWN selection)
• Burn-out Detection Time: 60 seconds
• Maximum Current Consumption: 450 mA at 5 V DC
• Weight: Approximately 0.2 kg (lightweight design)
• External Connection: Pressure clamp terminal (direct wiring)

Key Functional Features

• Suffix Code -S: Standard type for general RTD measurement applications.
• Suffix Code 5: No explosion protection – suitable for non-hazardous areas.
• Suffix Code 0: Basic type with standard feature set.
• 3-Wire RTD Support: Eliminates lead wire resistance errors for accurate readings.
• Channel Isolation: Each of the 12 channels is independently isolated from the system.
• Burn-out Detection: Detects sensor or wiring failures and drives output UP or DOWN.
• Dual-Redundant Ready: Supports system redundancy for critical temperature loops.

Frequently Asked Questions (FAQ)

• Q: What RTD types does the AAR181-S50 support?
  A: The AAR181-S50 supports Pt100 (100 Ω at 0 °C) in a 3-wire configuration per JIS and IEC standards.
• Q: How does the burn-out detection work on this module?
  A: You can set burn-out per module to UP or DOWN. The module detects an open circuit or broken sensor within 60 seconds.
• Q: What is the total resistance limit for RTD wiring?
  A: The allowable total resistance per wire (including sensor and lead wires) is 40 Ω or less for guaranteed accuracy.
• Q: Can I use this module with 2-wire RTD sensors?
  A: The AAR181-S50 is optimized for 3-wire connections. For 2-wire sensors, you must short the INA and INC terminals externally.
• Q: What is the data update rate for temperature readings?
  A: The module updates all 12 channel data every 1 second in normal operation.
• Q: Does this module support redundant system configurations?
  A: Yes, the AAR181-S50 works with Yokogawa's dual-redundant architecture for critical process loops.
• Q: How do I compensate for accuracy when measuring below 0 °C?
  A: Multiply the specified RTD accuracy (±120 mΩ) by coefficient K based on the thermoelectromotive force ratio at the measured temperature.

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