Yokogawa AST143 TC/mV Input Module

The Yokogawa AST143 is an advanced TC/mV input module designed for precise temperature and millivolt signal measurement in industrial automation systems. With its ability to handle up to 16 channels, this module ensures high accuracy and excellent signal isolation, making it ideal for reliable data acquisition. It integrates seamlessly with Yokogawa DCS systems and provides accurate temperature control for various industrial processes.

Key Features of the Yokogawa AST143

The AST143 stands out for its versatile input support and high performance in demanding industrial environments. Its key features include:

Support for Multiple Input Types: The AST143 is compatible with thermocouples (TC), RTDs, and thermistors, providing flexibility to meet diverse measurement needs.
Wide Input Range:
- Thermocouples: Measures temperatures from -200°C to 1500°C.
- RTDs: Handles temperature ranges from -200°C to 800°C.
- Thermistors: Measures from -50°C to 150°C.
High Accuracy: Offers a remarkable +0.2% of span accuracy, ensuring precise data even in challenging industrial conditions.
Fast Data Update: With a 10 ms data update period, the AST143 provides near-real-time data monitoring for rapid process control.

Additionally, the AST143 ensures high signal isolation with its built-in isolated barrier, protecting against electrical interference and enhancing measurement reliability.

Electrical and Performance Specifications

The AST143 offers exceptional performance across a wide range of temperatures and signals, ensuring reliable, accurate data acquisition for process control.

Input Range:
- Thermocouples: -200°C to 1500°C.
- RTDs: -200°C to 800°C.
- Thermistors: -50°C to 150°C.
Output: 4 to 20 mA for easy integration with industrial control systems.
Accuracy:
- +0.2% of span accuracy for precise measurements.
- At 23°C, the TC accuracy is +40 µV, and the mV accuracy is +80 µV.
Isolation: Features built-in isolation with a 1500 V AC withstand voltage between circuits and channels.
Input Resistance: Greater than 1 MΩ for both power ON and OFF conditions.
Drift Due to Ambient Temperature:
- For TC: +125 µV/10°C.
- Reference junction compensation ensures 1°C accuracy (exceptions below 44°C for Type B thermocouples).

With a 10 ms data update period, the AST143 provides fast, accurate readings, critical for real-time industrial applications.

Physical and Environmental Characteristics

Designed to meet the demanding conditions of industrial environments, the AST143 offers durability and high reliability.

Compact Design: The module features a space-efficient design that makes it suitable for use in control panels and equipment with limited space.
Weight: Weighs approximately 0.30 kg, ensuring easy installation and handling.

Technical Specifications

Feature	Specification
Product Type	TC/mV Input Module
Number of Channels	16
Input Types	Thermocouple (TC), Millivolt (mV)
Input Range	Thermocouples: -200°C to 1500°C
	RTDs: -200°C to 800°C
	Thermistors: -50°C to 150°C
Output	4 to 20 mA
Accuracy	+0.2% of span
Accuracy at 23°C	TC: +40 µV, mV: +80 µV
Communication Protocol	HART
Isolation	Built-in isolated barrier
Withstanding Voltage	1500 V AC between circuits and channels
Input Resistance	> 1 MΩ (Power ON/OFF)
Data Update Period	10 ms
Reference Junction Compensation	Integrated, 1°C accuracy (Type B exceptions below 44°C)
Drift Due to Ambient Temperature	TC: +125 µV/10°C
Weight	Approx. 0.30 kg

Manufacturer Information

The Yokogawa AST143 is manufactured by Yokogawa, a global leader in industrial automation and control systems. Known for high-quality, precision measurement and control equipment, Yokogawa is committed to delivering reliable solutions for the automation industry. The AST143 is a testament to their expertise in providing accurate temperature and millivolt signal measurement solutions.