Yokogawa AAM21J mV/Thermocouple/RTD Input Module
Product Overview
The Yokogawa AAM21J is a high-performance analog input module designed to measure low-level signals from thermocouples (TC), resistance temperature detectors (RTD), and millivolt (mV) sources. With 8 input channels and support for a wide range of sensor types, it offers exceptional flexibility and accuracy for demanding temperature monitoring and low-voltage signal acquisition in industrial applications. Integrated with Yokogawa’s CENTUM VP and CS 3000 systems, the AAM21J ensures reliable data collection in energy, chemical, oil & gas, and pharmaceutical environments.
Key Features
-
Multi-Signal Input Support – Accepts thermocouple, RTD, and millivolt signals for diverse sensor compatibility
-
8 Analog Input Channels – High-density data acquisition in a single module
-
High Accuracy and Resolution – 16-bit A/D conversion provides precise measurements across input types
-
Cold Junction Compensation (CJC) – Ensures temperature accuracy for thermocouple inputs
-
Open Circuit Detection – Identifies disconnected or faulty sensor wiring automatically
-
Isolated Channels – Protects signals and system integrity with channel-to-system isolation
-
Hot-Swappable – Module can be replaced during operation without system downtime
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) |
| Channels | 8 |
| Resolution | 16 bits |
| Accuracy | ±0.1% of reading (typical, sensor-dependent) |
| Input Impedance | >10 MΩ (mV input) |
| Cold Junction Compensation | Internal or external (user configurable) |
| Isolation | Channel-to-system isolation |
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 | Thermocouple / RTD / mV Input Module |
Industry Applications
-
Energy and Utilities – Monitors temperature-critical components in turbines, boilers, and generators
-
Oil & Gas – Tracks process and ambient temperatures in refineries and offshore platforms
-
Chemical and Petrochemical – Ensures accurate thermal measurement in exothermic and endothermic reactions
-
Pharmaceuticals – Supports GMP-compliant temperature monitoring in validated production processes
-
Food and Beverage – Maintains precise thermal profiles for quality and safety compliance
The Yokogawa AAM21J mV/Thermocouple/RTD Input Module delivers exceptional accuracy, flexibility, and reliability for temperature and low-voltage signal acquisition. Ideal for integration into complex control systems, it supports a wide array of sensor types and ensures stable, high-resolution input performance in even the most demanding industrial environments.
