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Product Introduction
The Yokogawa AMM21T is a Thermocouple Input Multiplexer Module meticulously designed for precise multi-channel temperature measurements in industrial environments. Part of Yokogawa’s renowned I/O module series, the AMM21T is engineered for use in high-reliability Distributed Control Systems (DCS), such as the CENTUM VP and CENTUM CS 3000 platforms.
The module enables temperature monitoring from multiple thermocouple types, supporting a wide range of industrial temperature sensors (Type K, J, T, E, B, R, S, N). With high channel density, advanced cold junction compensation (CJC), and channel-to-channel isolation, the AMM21T provides accurate and stable readings—even in electrically noisy environments.
Its compact form factor and robust design make it ideal for use in sectors like power generation, petrochemical processing, and advanced manufacturing, where thermal data acquisition and control are mission-critical.
Product Specifications
| Parameter | Details |
|---|---|
| Model | AMM21T |
| Manufacturer | Yokogawa Electric Corporation |
| Module Type | Thermocouple Input Multiplexer Module |
| Input Channels | 16 channels |
| Supported Thermocouples | Type K, J, T, E, B, R, S, N |
| Input Range | Based on TC type (e.g., –200°C to +1800°C) |
| Input Accuracy | ±1.0°C or ±0.1% of full scale (whichever is larger) |
| Resolution | 16-bit |
| Cold Junction Compensation | Built-in automatic CJC per channel |
| Isolation | Channel-to-channel and channel-to-ground |
| Sampling Time | Approx. 100 ms (16-channel scan) |
| Diagnostics | Built-in self-diagnostics and error detection |
| Power Supply | Supplied through backplane (typically 5 V DC) |
| Operating Temperature | 0°C to 50°C |
| Storage Temperature | –20°C to 70°C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
| Dimensions (W × H × D) | 120 × 90 × 35 mm |
| Weight | 0.485 kg |
| Mounting Method | Mounted on system rack or baseplate |
| Certifications | CE, UL, CSA, RoHS-compliant |
| System Compatibility | CENTUM VP, CENTUM CS 3000, ProSafe-RS |
Product Applications
-
Thermal Power Plants
Precise measurement of boiler temperatures, exhaust gas, and turbine component surfaces. -
Oil & Gas Refining
Monitoring critical process temperatures in distillation, cracking, and reforming units. -
Chemical Processing
Used for batch reactors, heat exchangers, and cryogenic system monitoring. -
Pharmaceutical Industry
Ensures temperature control in sterilizers, fermenters, and validated HVAC systems. -
Food and Beverage
Used in ovens, chillers, and pasteurization equipment to maintain thermal consistency. -
Steel and Metal Manufacturing
Measures furnace, mold, and rolling temperatures during production cycles.
Product Advantages
-
Multi-Thermocouple Support
Compatible with a wide range of thermocouple types, allowing flexible field integration. -
High Channel Density
16 input channels in a single compact module reduce cabinet space and installation costs. -
Channel Isolation
Prevents signal interference and ensures accurate readings even in noisy environments. -
Automatic Cold Junction Compensation
Enhances temperature measurement accuracy by adjusting for ambient temperature variance. -
Advanced Diagnostics
Built-in error checking ensures fast identification of sensor faults or wiring issues. -
Easy Integration
Seamlessly integrates into Yokogawa’s DCS and safety systems with minimal configuration. -
Compact & Durable Design
Industrial-grade materials and small footprint for rugged, space-saving installation. -
High Resolution
16-bit conversion ensures precise detection of even minor temperature variations. -
Lifecycle Longevity
Designed for extended operation cycles in mission-critical applications. -
Regulatory Compliance
Fully compliant with international certifications and environmental directives.
Frequently Asked Questions (FAQ)
-
What thermocouple types does the AMM21T support?
It supports K, J, T, E, B, R, S, and N types, covering most industrial applications. -
How many channels are available in the AMM21T?
The module provides 16 independent thermocouple input channels. -
Is the AMM21T compatible with the CENTUM VP system?
Yes, it is fully compatible with both CENTUM VP and CENTUM CS 3000 platforms. -
What is the resolution of the input signal?
The module offers 16-bit resolution for highly precise temperature readings. -
Does the module support cold junction compensation?
Yes, it features automatic cold junction compensation on each channel. -
Can I use different thermocouple types on different channels?
Yes, each channel can be configured independently for different TC types. -
What is the accuracy of temperature measurement?
±1.0°C or ±0.1% of full scale, whichever is larger. -
Does it have built-in diagnostics?
Yes, including detection of open TC wires and internal error status. -
Is channel-to-channel isolation included?
Yes, electrical isolation is provided between each channel and to ground. -
What is the typical application cycle time?
A complete 16-channel scan takes approximately 100 milliseconds.
Related or Same-Series Yokogawa Models
| Model | Description | Input Type | Channels | Resolution | Isolation |
|---|---|---|---|---|---|
| AMM11T | Voltage Input Multiplexer Module | 0–10 V DC | 8 | 16-bit | Yes |
| AMM12T | Voltage Input Multiplexer Module | 0–10 V DC | 16 | 16-bit | Yes |
| AAI841-H00 | Universal Analog Input Module | TC/mV/RTD | 16 | 16-bit | Yes |
| AAI143-H50 | HART Analog Input Module | 4–20 mA + HART | 16 | 16-bit | Yes |
| AAI141-S50 | Standard Analog Input Module | 4–20 mA | 8 | 12-bit | Yes |
| AAD142 | Differential Analog Input Module | ±10 V DC | 16 | 16-bit | Yes |
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|---|---|---|---|---|---|
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