The Yokogawa ASI133 Analog Input Module is an isolated analog input module designed for Yokogawa CENTUM VP and CENTUM CS 3000 Distributed Control Systems (DCS). The module provides high-accuracy acquisition of standard 4–20 mA process signals from field transmitters, including pressure, temperature, flow, level, and analytical instruments. With channel isolation, high measurement accuracy, and continuous self-diagnostics, the ASI133 is suitable for demanding industrial process control applications requiring reliable analog signal monitoring.

Contents

• 1. Product Overview
• 2. Main Features
• 3. Typical Applications
• 4. Installation Preparation
• 5. Module Installation
• 6. Field Wiring
• 7. System Configuration
• 8. Commissioning Procedure
• 9. Functional Verification
• 10. Preventive Maintenance
• 11. Practical Installation Case
• 12. Frequently Asked Questions

Product Overview

The ASI133 receives analog current signals from two-wire or four-wire field transmitters and converts them into digital process values for the CENTUM controller. The module supports isolated input channels to minimize electrical interference and improve measurement stability. It is widely used for continuous monitoring of critical process variables throughout industrial automation systems.

Main Features

• 16 isolated analog input channels
• Supports standard 4–20 mA process signals
• High measurement accuracy
• Channel-to-channel electrical isolation
• Continuous self-diagnostic functions
• Excellent noise immunity
• Industrial-grade reliability
• Designed for continuous 24-hour operation

Typical Applications

• Pressure transmitter inputs
• Temperature transmitter monitoring
• Flow transmitter measurement
• Level transmitter acquisition
• Analytical instrument inputs
• Oil and gas facilities
• Petrochemical plants
• Power generation systems

Installation Preparation

• Verify the ASI133 model and suffix code.
• Confirm compatibility with the FIO node.
• Prepare the appropriate terminal block.
• Inspect field transmitter wiring.
• Verify cabinet grounding.
• Review loop drawings.
• Confirm transmitter power supply.

Module Installation

1. Turn off cabinet power.
2. Insert the ASI133 into the designated slot.
3. Secure the module.
4. Install the terminal assembly.
5. Connect analog input wiring.
6. Verify channel assignments.
7. Inspect all wiring before energizing.

Field Wiring

• Use shielded twisted-pair signal cables.
• Connect transmitters according to loop drawings.
• Verify polarity of each current loop.
• Ground cable shields at one end only.
• Separate signal cables from power wiring.
• Label all analog loops clearly.

System Configuration

• Create the analog input module in CENTUM engineering software.
• Assign tag names to each channel.
• Configure input range and engineering units.
• Set alarm limits if required.
• Download controller configuration.
• Review module diagnostics.

Commissioning Procedure

VERIFY MODULE INSTALLATION
CHECK POWER STATUS
VERIFY FIELD WIRING
POWER UP SYSTEM
CHECK MODULE DIAGNOSTICS
VERIFY INPUT SIGNALS
CHECK PROCESS VALUES
CONFIRM NORMAL OPERATION

Functional Verification

• Verify all channels communicate normally.
• Measure transmitter output currents.
• Compare displayed values with field instruments.
• Verify alarm functions.
• Review module diagnostics.
• Monitor measurement stability.

Preventive Maintenance

• Inspect terminal connections periodically.
• Verify cable shielding.
• Review diagnostic history.
• Check transmitter calibration.
• Inspect cabinet grounding.
• Perform scheduled loop verification.

Practical Installation Case

A refinery process upgrade required installation of additional pressure and flow transmitters for a new distillation unit. Engineers installed ASI133 Analog Input Modules to acquire sixteen independent 4–20 mA signals. After completing installation, field wiring, configuration, and loop testing, all transmitter signals were accurately displayed within the CENTUM DCS, providing reliable real-time process monitoring.

Frequently Asked Questions

What type of signals does the ASI133 support?

The ASI133 is designed for standard 4–20 mA analog current input signals from industrial transmitters.

How many analog input channels are available?

The module provides sixteen isolated analog input channels for continuous process measurement.

Can the ASI133 be used with two-wire transmitters?

Yes. The module supports standard industrial two-wire and four-wire transmitters when installed according to Yokogawa wiring specifications.

Summary

The Yokogawa ASI133 Analog Input Module provides reliable high-accuracy acquisition of standard 4–20 mA process signals for Yokogawa CENTUM Distributed Control Systems. Proper installation, correct field wiring, accurate configuration, and comprehensive commissioning ensure stable process measurement, dependable diagnostics, and long-term operational reliability.