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- Yokogawa
- AAR181-S50 S2
- RTD Input Module
- Japan
- 107.5 × 130 × 32.8 mm
- 0.2 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa AAR181-S50 S2 is a high-precision RTD Input Module used in Yokogawa CENTUM / ProSafe-RS distributed control systems. It is designed for accurate multi-channel temperature measurement, converting resistance signals from RTD sensors (such as Pt100) into digital data for process control and monitoring.
This module is widely used in industrial environments requiring reliable temperature acquisition, strong isolation, and stable long-term performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa |
| Model | AAR181-S50 S2 |
| Product Type | RTD Input Module |
| System Compatibility | Yokogawa CENTUM / ProSafe-RS |
| Function | Temperature signal acquisition (RTD input) |
| Input Channels | 12 isolated channels |
| Input Type | RTD (Pt100, 3-wire typical) |
| Input Range | Resistance-to-temperature conversion |
| Measurement Current | Approx. 1 mA |
| Input Voltage Range | ±5 V |
| Signal Isolation | Channel-to-channel and system isolation |
| Accuracy | High precision industrial temperature measurement |
| Burn-out Detection | Supported |
| Data Update Cycle | ~1 second scan cycle |
| Communication | Backplane interface with controller |
| Mounting Type | Rack-mounted module |
| Operating Environment | Industrial control cabinet |
| Humidity Range | 5%–95% non-condensing |
| Dimensions | 107.5 × 130 × 32.8 mm |
| Weight | 0.2 kg |
Function and Working Principle
The AAR181-S50 S2 operates as a temperature signal acquisition and conversion module.
Its core functions include:
- Receiving resistance signals from RTD sensors
- Converting resistance values into temperature data
- Supplying excitation current for RTD measurement
- Detecting sensor faults such as open circuit (burn-out)
- Providing electrical isolation to reduce noise interference
It serves as a front-end temperature interface module in DCS systems.
Role in Industrial Control Systems
Within Yokogawa control systems, this module provides:
- Accurate multi-point temperature monitoring
- Integration of RTD sensors into centralized DCS control
- Stable process variable acquisition for control loops
- High immunity to industrial electrical noise
- Reliable operation in continuous process environments
Industrial Applications
The AAR181-S50 S2 is widely used in:
- Power generation plants (boiler & turbine temperature monitoring)
- Oil and gas processing systems
- Chemical and petrochemical industries
- Metallurgy and furnace control systems
- Industrial HVAC systems
- General process automation
Installation and System Integration
Recommended installation practices include:
- Installing in Yokogawa FIO / CENTUM I/O racks
- Ensuring correct backplane alignment
- Using proper RTD wiring (2-wire / 3-wire / 4-wire depending design)
- Applying shielded cables to reduce noise
- Performing channel calibration during commissioning
Compatible System Components
The AAR181-S50 S2 typically works with:
- Yokogawa CENTUM controllers
- RTD sensors (Pt100, Pt1000)
- Other analog and digital I/O modules
- Field termination assemblies
- Industrial monitoring systems
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| AAR181-S50 S2 | RTD input module | 12-channel isolated temperature input | DCS systems |
| AAR181-H00/K4A00 | RTD input module | High-precision temperature measurement | Process control |
| AAR145-S50 S1 | RTD/POT input module | Multi-signal input capability | Monitoring systems |
| AAI543-S53 | Analog input module | High-accuracy analog acquisition | Industrial measurement |
| AAI835-S53 | Analog I/O module | Multi-channel signal processing | Automation systems |
Key Advantages
- 12-channel isolated RTD input design
- High accuracy temperature measurement
- Strong electrical isolation for stability
- Built-in sensor fault detection (burn-out)
- Stable long-term industrial operation
- Seamless integration with Yokogawa DCS systems
Technical FAQs
What is the AAR181-S50 S2 used for?
It is used for high-precision RTD temperature measurement in industrial control systems.
How many channels does it support?
It supports 12 isolated input channels.
What type of sensors does it support?
RTD sensors such as Pt100 (typically 3-wire).
Does it detect sensor failure?
Yes, it supports burn-out detection.
Conclusion
The Yokogawa AAR181-S50 S2 RTD Input Module is a reliable and high-accuracy temperature acquisition device designed for industrial automation systems. With multi-channel isolation, stable measurement performance, and strong integration capability, it is widely used in process control and critical temperature monitoring applications.