Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AMM25C |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.1 kg |
| Dimensions | 2.5 cm x 22.9 cm x 7.6 cm |
| Product Type | mV Input Multiplexer Module |
| System Compatibility | CENTUM CS 3000 and CENTUM CS 1000 |
| Input Function | mV signal multiplexing |
| Channel Configuration | 15 points |
| Additional Interface | Thermocouple interface with RJC input port |
Cold Junction Compensation and Channel Signal Handling
The Yokogawa AMM25C incorporates thermocouple interface capability with an added reference junction compensation (RJC) input port. The module manages low-level millivolt signal acquisition by multiplexing multiple input points into the CENTUM CS controller I/O structure.
For thermocouple measurement applications, cold junction compensation (CJC) processing is required to maintain temperature measurement accuracy. The AMM25C architecture supports signal routing between field thermocouple inputs and the control system input processing layer.
The module design follows Yokogawa DCS I/O practices, including channel-to-channel signal separation and controlled analog input transmission within the I/O module nest environment.
Frequently Asked Questions
Q: What type of signals does the AMM25C process?
A: The AMM25C is designed for millivolt input signal multiplexing and supports thermocouple interface operation with an RJC input port.
Q: Which Yokogawa systems are compatible with the AMM25C?
A: The AMM25C is specified for use with CENTUM CS 3000 and CENTUM CS 1000 system I/O configurations.
Q: Does the AMM25C provide internal power conversion or signal amplification?
A: The provided specifications identify the AMM25C as a multiplexer module. Power conversion and amplification functions are not specified in the available data.
Field Installation Guidelines
- Install the AMM25C according to the Yokogawa CENTUM CS 3000 or CENTUM CS 1000 I/O module installation procedures.
- Verify the module slot position and I/O nest compatibility before mounting.
- Use shielded instrumentation cables for millivolt and thermocouple signal wiring to reduce external electrical interference.
- Connect cable shields according to the plant grounding standard and avoid parallel routing with high-voltage power cables.
- Confirm thermocouple polarity and RJC input wiring before system commissioning.
- Inspect terminal connections for proper mechanical tightening and secure signal continuity.
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