AAR181-S50 | Yokogawa RTD Input Module 12-Ch Isolated

AAR181-S50 – RTD Input Module

Brand: Yokogawa | Model: AAR181-S50 | Type: 12-Channel Isolated RTD Input

This module accepts 12 RTD inputs (Pt100, 3-wire). It provides isolation, burn-out detection, and high accuracy. It is ideal for temperature monitoring in industrial processes.

Key Features

• 12 isolated channels – for Pt100 RTD sensors
• High accuracy – ±120 mΩ
• Burn-out detection – configurable per channel
• 1 second update – fast data refresh
• Pressure clamp terminals – secure wiring

Technical Specifications

• Input type – RTD (Pt100, 3-wire)
• Channels – 12, isolated
• Accuracy – ±120 mΩ
• Measurement current – 1 mA
• Wiring resistance – ≤40 Ω per wire (must be equal for INA and INC)
• Input resistance – ≥2 MΩ (power ON or OFF)
• Withstanding voltage – 1500 VAC for 1 minute
• Allowable input voltage – ±5 V
• Temperature drift – ±120 mΩ /10 °C
• Data update – 1 second
• Burn-out detection – UP/DOWN, 60 s detection time
• Current consumption – 450 mA at 5 V DC
• Weight – 0.2 kg
• Connection – pressure clamp terminal

Installation & Wiring

• Mounting – snap onto DIN rail
• Wiring – use 3-wire Pt100, keep wires short
• Important – INA and INC wiring resistance must match
• Redundancy – dual-redundant config adds ±40 μV offset

Standards & Certifications

• RTD standards – JIS C1604:1997, IEC751:1995
• Isolation – 1500 VAC between input and system
• Protection – IP20 (when installed in panel)

Manager’s Insight

“The AAR181-S50 offers reliable RTD measurement with excellent isolation. Burn-out detection gives peace of mind. The 1-second update keeps processes responsive. A solid choice for temperature-critical applications.”

Expert Review

“We have used this module in several plants. The accuracy holds well over time. Wiring is straightforward with clamp terminals. It works seamlessly with Yokogawa DCS and PLC systems.”

Applications

• Temperature monitoring in chemical plants
• Pharmaceutical production
• Food and beverage processing
• HVAC systems
• Power generation
• Oil and gas facilities

Comparison Models

• AAR181-S50 – standard type (this model)
• AAR181-S51 – with explosion protection
• AAR181-S50-1 – with different terminal type
• AAR181-S50-2 – enhanced accuracy version

FAQ

• What sensors work with this module?
  Only Pt100 RTD sensors (3-wire type).
• Can I use 2-wire RTD?
  No, this module requires 3-wire for accurate measurement.
• How do I set burn-out detection?
  Configure via software or DCS; all channels share one setting.
• What is the update rate?
  1 second for all 12 channels.
• Is wiring resistance critical?
  Yes, keep INA and INC resistance equal to avoid errors.

Buying Guide

• Sensor type – ensure Pt100, 3-wire.
• Cable length – keep wiring resistance below 40 Ω per wire.
• Environment – check operating temperature; derating may apply.
• Redundancy – order two modules for dual-redundant systems.
• Spare – keep one module for quick replacement.

Warranty & Shipping

• Warranty – 12 months against defects.
• Shipping – dispatched within 12-24 hours.
• Carriers – FedEx, UPS, DHL with tracking.

For inquiries: sales@powergearx.com | +86 18030005825 (WhatsApp)

Copyright © 2026 Powergear X Automation Limited. All rights reserved.
Original Source: https://www.powergearx.com/