The YOKOGAWA AMM21T is a specialized Thermocouple Input Multiplexer Module engineered for precision thermal data acquisition in industrial process control environments. This module enables the integration of multiple thermocouple sensors into a centralized Yokogawa control architecture, providing stable, high-resolution temperature monitoring for critical industrial processes.

Hardware Specifications

Process Control & Connectivity

The AMM21T is designed to act as a high-density interface for thermocouple signals. By utilizing multiplexing technology, the module efficiently samples multiple temperature inputs and converts them into digitized data for the control system. This approach significantly reduces cabinet space requirements while maintaining high signal integrity. The module is engineered to provide the cold-junction compensation necessary for accurate thermocouple readings, ensuring consistent performance even as ambient temperatures fluctuate within the control room or field cabinet.

Frequently Asked Questions

Q: Does the AMM21T provide cold-junction compensation?

A: Yes, the AMM21T is designed to manage the cold-junction compensation required for various thermocouple types, ensuring that the temperature measurements are accurate regardless of the terminal temperature.

Q: How many thermocouple sensors can be connected to this module?

A: The AMM21T is a multiplexer designed to handle multiple inputs; please refer to the specific technical manual for your system revision to confirm the exact number of channels supported, as this can vary based on module configuration and system architecture.

Field Installation Guidelines

• Mounting: Install the AMM21T securely into the rack assembly. Ensure that the module is properly seated in the connector to prevent high-resistance contact points that could introduce error into the thermocouple loop.
• Wiring: Use thermocouple-grade extension wire that matches the sensor type (e.g., K-type extension wire for K-type sensors). Shielded cables are highly recommended to minimize the impact of electromagnetic noise on these low-voltage signals.
• Grounding: Connect the module's ground reference to the system's clean signal ground bus. Proper grounding is critical for minimizing common-mode noise, which is particularly sensitive in low-voltage thermocouple measurements.
• Commissioning: Perform a calibration check using a thermocouple simulator to verify the module's input mapping and to ensure that the DCS software correctly interprets the raw signals for each channel.