Yokogawa AMM21T Thermocouple Input Multiplexer Module

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

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)

1. What thermocouple types does the AMM21T support?

   It supports K, J, T, E, B, R, S, and N types, covering most industrial applications.

2. How many channels are available in the AMM21T?

   The module provides 16 independent thermocouple input channels.

3. Is the AMM21T compatible with the CENTUM VP system?

   Yes, it is fully compatible with both CENTUM VP and CENTUM CS 3000 platforms.

4. What is the resolution of the input signal?

   The module offers 16-bit resolution for highly precise temperature readings.

5. Does the module support cold junction compensation?

   Yes, it features automatic cold junction compensation on each channel.

6. Can I use different thermocouple types on different channels?

   Yes, each channel can be configured independently for different TC types.

7. What is the accuracy of temperature measurement?

   ±1.0°C or ±0.1% of full scale, whichever is larger.

8. Does it have built-in diagnostics?

   Yes, including detection of open TC wires and internal error status.

9. Is channel-to-channel isolation included?

   Yes, electrical isolation is provided between each channel and to ground.

10. What is the typical application cycle time?

    A complete 16-channel scan takes approximately 100 milliseconds.