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| Company Information | ||||||||
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| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Introduction
The Yokogawa AMM21 Thermocouple Input Multiplexer Module is a high-performance analog input module designed for precise temperature measurement in process control systems. It is a key component of Yokogawa’s distributed control systems (DCS), including the CENTUM and STARDOM series. The AMM21 supports multiple thermocouple types and provides accurate, real-time temperature monitoring for critical industrial applications.
This module enables the acquisition of multiple thermocouple input signals through its multiplexing architecture, which allows multiple channels to share one high-accuracy analog-to-digital converter (ADC). The AMM21 provides excellent linearity, minimal drift, and high immunity to noise and interference. It also includes automatic cold junction compensation (CJC) to ensure stable and accurate temperature readings, even under fluctuating ambient conditions.
Built for demanding industrial environments, the AMM21 combines precision, reliability, and flexibility. It is ideal for use in applications requiring accurate temperature tracking and long-term operational stability.
Technical Specifications
| Parameter | Description |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Model | AMM21 |
| Product Type | Thermocouple Input Multiplexer Module |
| Function | Multi-channel temperature signal acquisition |
| Number of Channels | 16 thermocouple input channels |
| Supported Thermocouple Types | Type K, J, T, E, N, B, R, S |
| Input Range | Based on thermocouple type (e.g., -200°C to +1800°C) |
| Input Impedance | ≥ 10 MΩ |
| Resolution | 16-bit analog-to-digital conversion |
| Accuracy | ±0.1% of full scale (typical) |
| Cold Junction Compensation (CJC) | Automatic, integrated |
| Sampling Rate | Up to 100 samples per second per channel |
| Input Isolation | Channel-to-bus and channel-to-ground isolation |
| Common Mode Rejection Ratio (CMRR) | >100 dB |
| Line Noise Rejection | 50/60 Hz filtering built-in |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -20°C to +70°C |
| Relative Humidity | 10% to 90%, non-condensing |
| Power Supply Voltage | 24 V DC (supplied through I/O base) |
| Power Consumption | Approx. 3.5 W |
| Diagnostics | Self-check, open thermocouple detection, input fault indication |
| Interface | Compatible with Yokogawa DCS I/O bus system |
| Mounting Type | Plug-in module for standard I/O rack |
| Dimensions | 45 × 97 × 103 mm |
| Weight | 0.3 kg |
| Compliance | CE, RoHS, IEC 61010-1, IEC 61326-3-1 |
| Protection | Input overvoltage protection and reverse polarity protection |
| Cooling | Natural convection |
| Maintenance | Hot-swappable module for easy replacement |
Applications
The Yokogawa AMM21 Thermocouple Input Multiplexer Module is widely used in industries where precise temperature control is critical. It supports various thermocouple types, making it adaptable to many process environments. Key applications include:
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Petrochemical and Refining Plants: Accurate temperature monitoring in reactors, distillation columns, and heat exchangers.
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Power Generation: Thermal monitoring in boilers, turbines, and exhaust systems.
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Pharmaceutical Manufacturing: Ensures consistent temperature control during formulation and sterilization.
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Food and Beverage Industry: Maintains optimal process temperatures in cooking, fermentation, and packaging lines.
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Metallurgy and Furnace Control: Provides reliable readings in high-temperature furnace and kiln operations.
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Semiconductor Fabrication: Monitors critical process temperatures in vacuum chambers and wafer processing equipment.
Advantages
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Wide Thermocouple Compatibility: Supports multiple thermocouple types for versatile temperature measurement applications.
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High Accuracy and Resolution: 16-bit conversion and integrated cold junction compensation ensure precision.
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Excellent Noise Immunity: Advanced filtering and isolation minimize the impact of electromagnetic interference.
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Automatic Fault Detection: Built-in diagnostics detect open thermocouples and signal faults instantly.
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Compact and Modular Design: Space-saving structure integrates seamlessly into Yokogawa I/O racks.
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Easy Integration: Fully compatible with CENTUM VP and STARDOM systems for flexible configuration.
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High Reliability: Designed for continuous operation in demanding industrial environments.
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Low Maintenance Requirements: Hot-swappable design reduces downtime during maintenance or replacement.
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Stable Long-Term Performance: Ensures minimal drift and consistent readings even under temperature fluctuations.
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Energy Efficient: Optimized power consumption contributes to overall system efficiency.
FAQ
1. What thermocouple types are supported by the AMM21?
The AMM21 supports thermocouple types K, J, T, E, N, B, R, and S, covering a broad temperature measurement range suitable for diverse industrial processes.
2. Does the AMM21 include cold junction compensation (CJC)?
Yes, it includes automatic cold junction compensation to maintain accurate readings regardless of ambient temperature variations.
3. How does the AMM21 handle noise and signal interference?
The module features channel isolation, shielding, and 50/60 Hz noise rejection filters to ensure stable operation even in noisy environments.
4. What is the input accuracy of the AMM21?
It provides an accuracy of approximately ±0.1% of full scale, depending on the thermocouple type and measurement range.
5. Is it possible to mix different thermocouple types on one module?
Yes, each channel can be configured independently to support different thermocouple types, allowing flexible deployment.
6. Can the AMM21 detect open or faulty thermocouples?
Yes, it has built-in diagnostics that automatically detect open-circuit or disconnected thermocouples and report them to the control system.
7. What is the resolution of the AMM21’s A/D converter?
The AMM21 uses a 16-bit analog-to-digital converter for fine measurement precision.
8. Is the AMM21 compatible with Yokogawa’s CENTUM VP DCS system?
Yes, the AMM21 is fully compatible with the CENTUM VP, CS3000, and STARDOM control platforms.
9. How does the AMM21 ensure measurement stability over time?
Its temperature-compensated circuitry and high-quality components minimize drift, ensuring stable long-term accuracy.
10. Can the AMM21 be replaced without system shutdown?
Yes, it supports hot-swapping, meaning it can be replaced or serviced while the system remains operational.
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| Model | Description |
|---|---|
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