Product Overview

The Yokogawa AST143 is a high-density Thermocouple (TC) and Millivolt (mV) Input Module designed for the CENTUM VP Field Integrated Operation (FIO) system. It provides 16 channels for accurate acquisition of temperature signals from a wide range of thermocouples and millivolt inputs. This module is widely used in critical applications such as power generation, oil & gas, and heavy industry, where precise temperature monitoring is essential. Supplied as 100% brand new, original factory equipment, the AST143 ensures high measurement accuracy, stability, and seamless integration into Yokogawa DCS environments.

Technical Specifications

Engineering Advantages

High-Speed Data Processing
With a 10 ms update cycle, the module delivers fast and responsive temperature data acquisition, enabling immediate control actions in dynamic processes such as turbines and reactors.

Superior Signal Isolation
Each channel features 1500 V AC isolation, preventing electrical interference and ground loops, ensuring stable and accurate readings across all inputs.

Integrated Cold Junction Compensation
Built-in compensation with ±1°C accuracy eliminates the need for external compensation devices, simplifying installation and reducing system complexity.

Multi-Sensor Versatility
Supports thermocouples, RTDs, and thermistors, allowing engineers to standardize temperature measurement across diverse applications using a single module type.

FAQs

Does the AST143 support HART communication?
Yes, it supports HART communication, enabling remote diagnostics and configuration of compatible intelligent field transmitters.

How does the module handle a broken thermocouple wire?
It includes burnout detection. If a sensor fails, the module forces the output to a predefined up-scale or down-scale value and triggers an alarm.

Is the AST143 compatible with different thermocouple types?
Yes, it supports common thermocouple types such as J, K, E, T, R, S, and B. Each channel can be individually configured via Yokogawa engineering tools.

Can the module be replaced without shutting down the system?
Yes, the AST143 supports hot-swapping in FIO nests, allowing replacement without powering down the system, subject to node configuration and redundancy rules.