Yokogawa AAM21-S2 mV/Thermocouple/RTD Input Module
Product Overview
The Yokogawa AAM21-S2 is a versatile and high-precision analog input module engineered for the acquisition of millivolt (mV), thermocouple (TC), and resistance temperature detector (RTD) signals. With support for a broad range of sensor types and up to 8 input channels, this module is ideal for temperature-critical and low-voltage signal monitoring applications. It is fully compatible with Yokogawa’s CENTUM VP and CS 3000 systems, providing seamless integration for industries requiring stable, accurate temperature control and data reliability.
Key Features
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Multi-Sensor Compatibility – Supports TC, RTD, and mV inputs for flexible sensor integration
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8 High-Precision Channels – Enables dense input acquisition in space-constrained environments
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Cold Junction Compensation (CJC) – Built-in CJC ensures thermocouple accuracy
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High Resolution and Accuracy – 16-bit A/D conversion delivers reliable measurement precision
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Sensor Fault Detection – Open-circuit and short detection improves diagnostics and uptime
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Channel-to-System Isolation – Enhances safety and reduces electrical noise
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Hot Swap Capability – Allows module replacement without halting system operations
Technical Specifications
3.1 Dimensions and Weight
| Item | Specification |
|---|---|
| Dimensions | 42.9 × 130 × 146.8 mm |
| Weight | 0.1 kg |
3.2 Electrical Characteristics
| Item | Specification |
|---|---|
| Input Types | Thermocouple (J, K, T, E, R, S, B, N), RTD (Pt100, JPt100), mV (±100 mV) |
| Number of Channels | 8 |
| A/D Resolution | 16 bits |
| Accuracy | ±0.1% of reading (typical, sensor-dependent) |
| Input Impedance | >10 MΩ (mV inputs) |
| Cold Junction Compensation | Internal (standard) |
| Isolation | Galvanic isolation (channel-to-system) |
3.3 Environmental Characteristics
| Item | Specification |
|---|---|
| Operating Temp | 0°C to +55°C |
| Storage Temp | -40°C to +70°C |
| Humidity | 5%–95% RH (non-condensing) |
| Vibration | IEC 60068-2 compliant |
| Protection | IP20 (when mounted in rack) |
3.4 System Compatibility
| Item | Specification |
|---|---|
| Compatible Systems | Yokogawa CENTUM VP / CS 3000 |
| Module Type | Analog Input (TC/RTD/mV) Module |
Industry Applications
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Power Generation – Reliable temperature monitoring of turbines, heat exchangers, and boilers
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Oil & Gas – Accurate thermal tracking in refining, pipeline, and offshore systems
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Chemical Processing – Ensures safety and control in temperature-sensitive reactions
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Pharmaceuticals – Supports validated environments requiring strict thermal regulation
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Metals and Materials – Monitors furnace and process temperatures for material consistency
The Yokogawa AAM21-S2 mV/Thermocouple/RTD Input Module is a robust, high-resolution solution for industrial-grade analog signal acquisition. Its compatibility with a variety of sensor types and stable performance make it an essential component in process control systems that demand precision, reliability, and versatility.
