Yokogawa AAT145-S50 16-Channel Isolated TC/mV Module

Product Overview

The Yokogawa AAT145-S50 is a 16-channel TC/mV input module for industrial process measurement. It accepts thermocouple and millivolt signals from field instruments. Each channel provides electrical isolation from the system and other channels.

The AAT145 supports individual TC or mV configuration for each input channel. This flexibility allows engineers to connect different measurement types within one module. The module also supports dual-redundant configurations for suitable system architectures.

Its isolated input design helps reduce signal interference between field measurement circuits. It also supports reliable temperature monitoring in distributed control applications. Engineers can use it for process temperature acquisition and low-level voltage measurement.

Technical Specifications

Measurement Performance and Signal Characteristics

• Measurement Range: Supports two mV ranges: -100 to 150 mV and -20 to 80 mV.
• Thermocouple Compatibility: Supports eight specified thermocouple types for temperature measurement.
• Measurement Accuracy: The specified input accuracy is ±40 µV.
• Input Resistance: Maintains at least 1 MΩ under powered and unpowered conditions.
• Signal Source Resistance: Supports up to 1000 Ω for the combined source and wiring resistance.
• Temperature Drift: The specified drift is ±80 µV per 10°C.
• Update Period: Refreshes measurement data every second.

Engineering Note: The published specifications do not establish a separate frequency response, sensitivity, linearity, or resolution value. Engineers should consult the applicable Yokogawa hardware documentation before using these values in measurement calculations.

Reference Junction Compensation Performance

The AAT145-S50 uses reference junction compensation for thermocouple measurements. Its accuracy depends on terminal board ambient temperature and installation conditions.

These values help engineers evaluate temperature measurement uncertainty. Check the actual terminal board environment during system design and commissioning.

Input Isolation and Electrical Protection

The module provides isolation between field inputs and the system. It also provides isolation between individual input channels.

• Field-to-System Isolation: Helps separate field measurement circuits from system electronics.
• Channel Isolation: Reduces electrical interaction between independent measurement circuits.
• Withstanding Voltage: Supports the specified AC dielectric test conditions.
• Input Voltage Limit: The allowable input voltage is ±5 V.
• Redundant Configuration: Supports dual-redundant system configurations.

Isolation does not replace correct grounding or wiring practices. Follow Yokogawa installation instructions and applicable electrical safety requirements.

Installation Guide

1. Check the Model: Confirm the complete AAT145-S50 ordering code before installation.
2. Verify the Slot: Check the system hardware configuration and approved module location.
3. Inspect the Terminal Board: Confirm the applicable AET4D terminal board and connection arrangement.
4. Prepare the Cable: Use the specified dedicated KS1 connection cable.
5. Check Field Wiring: Verify thermocouple polarity and signal wiring before energizing the system.
6. Configure Each Channel: Set CH1 to CH16 individually for TC or mV measurement.
7. Verify Compensation: Check the reference junction compensation conditions for thermocouple inputs.
8. Perform Commissioning: Compare module readings against a calibrated field instrument.

Important: Confirm the exact terminal board, cabinet arrangement, and system revision before installation. Follow the applicable Yokogawa hardware manual.

Commissioning, Configuration and Maintenance

The channel-specific signal configuration helps simplify mixed-signal applications. Engineers can configure thermocouple and mV inputs within the same 16-channel module.

• Channel Setup: Assign the correct input type to each measurement point.
• Signal Verification: Compare displayed readings with a calibrated temperature or voltage source.
• Burnout Monitoring: Configure the available UP/DOWN burnout detection function.
• Reference Junction Check: Verify terminal board temperature conditions.
• Wiring Inspection: Check terminal tightness, cable condition, and thermocouple polarity.
• Trend Monitoring: Review measurement changes to identify abnormal signal behavior.

During troubleshooting, check the field sensor before replacing the input module. A faulty thermocouple, loose terminal, or incorrect channel configuration can produce similar symptoms.

Compatibility and System Integration

The Yokogawa AAT145-S50 belongs to the AAT145 input module family. It requires the appropriate Yokogawa system hardware and connection accessories.

• Terminal Board: AET4D is referenced in the specified reference junction compensation conditions.
• External Cable: Dedicated KS1 cable.
• Input Devices: Compatible specified thermocouples and low-level mV signal sources.
• System Architecture: Supports dual-redundant configurations where the system design permits.
• Channel Arrangement: Sixteen individually configurable TC/mV input channels.

Do not assume compatibility based on the AAT145 series name alone. Verify system revision, base unit, terminal board, cable, and redundancy requirements before ordering.

Typical Industrial Applications

• Oil and Gas: Monitor process temperatures in separation units, pipelines, and refining equipment.
• Petrochemical Plants: Acquire temperature signals from reactors, heaters, and distillation columns.
• Power Generation: Monitor auxiliary equipment and process temperatures in power stations.
• Chemical Processing: Collect thermocouple measurements from reactors and process vessels.
• Pharmaceutical Production: Monitor temperature points in process equipment and utility systems.
• Industrial Furnaces: Measure temperature at multiple zones using different thermocouple types.

Diagnostic Capabilities and Field Troubleshooting

The AAT145-S50 supports measurement acquisition and configurable burnout detection. Engineers can use these functions to investigate abnormal temperature readings.

Field Example: A reactor temperature channel reports a reading below the expected process value. The engineer first checks thermocouple polarity and terminal tightness. The engineer then verifies the channel's TC configuration and reference junction compensation. If the field signal remains correct, the engineer can investigate the terminal board and input module.

Practical Advice: Avoid replacing the AAT145 immediately after one abnormal reading. First isolate the sensor, cable, terminal board, and configuration as separate fault sources.

Global PLC Spare HUB's Insight

From an industrial maintenance perspective, the AAT145-S50 offers useful flexibility for mixed thermocouple and mV measurement applications. Its 16 isolated channels help engineers integrate different field measurement points within one module.

One important consideration involves reference junction compensation. Engineers should not evaluate thermocouple accuracy using the input accuracy specification alone. Terminal board temperature also affects the overall measurement result.

For example, a furnace monitoring system may use Type K thermocouples across several heating zones. Another channel may receive an independent mV signal. The AAT145 allows engineers to configure these inputs individually.

Before purchasing, confirm the complete model code, terminal board, cable, system configuration, and required redundancy arrangement. These checks help reduce commissioning delays and compatibility risks.

Packaging and Delivery

• Product: Yokogawa AAT145-S50 TC/mV Input Module.
• Accessories: Standard product accessories according to the supplied configuration.
• Packaging: Protective industrial packaging for international transportation.
• Inspection: Model identification and appearance checks before dispatch.
• Shipping Methods: FedEx, UPS, and DHL.
• Dispatch Time: Typically 24–48 hours after order and shipping details confirmation, subject to stock availability.
• Worldwide Delivery: International shipping support for industrial automation customers.

Note: The KS1 cable and AET4D terminal board are not automatically included. Please confirm the required accessories when placing your order.

Warranty and After-Sales Support

Warranty Period: 12 Months

• We provide a 12-month warranty from the agreed warranty start date.
• We check the product model and physical condition before shipment.
• We provide technical assistance for model identification and compatibility checks.
• We assist with troubleshooting when customers report product-related issues.
• For confirmed product quality issues, Ubest covers the agreed return shipping costs.

Contact our sales team for warranty procedures, delivery arrangements, and technical support.

Frequently Asked Questions (FAQ)

Q1: Can the AAT145-S50 measure thermocouple and mV signals simultaneously?

Yes. Engineers can configure each of the 16 channels individually. Some channels can measure TC signals while others measure mV signals.

Q2: Does the AAT145-S50 support RTD and potentiometer inputs?

The AAT145 family description includes RTD and potentiometer signal support. However, the supplied AAT145-S50 specifications identify TC and mV inputs. Confirm the exact model variant before using RTD or POT sensors.

Q3: Why does a thermocouple channel show an offset after installation?

Check reference junction compensation first. Terminal board temperature can affect measurement accuracy. Also inspect thermocouple polarity, terminal connections, and cable extensions.

Q4: Can I replace an existing AAT145 module without changing the terminal board?

Do not assume direct replacement compatibility. Check the existing hardware revision, terminal board type, cable arrangement, and system configuration. Confirm the complete ordering code before installation.

Q5: How should engineers distinguish a sensor fault from an AAT145 input fault?

Measure the field signal using a calibrated instrument. Then inspect the wiring and channel configuration. If possible, test the input with a suitable thermocouple simulator or mV calibrator. Compare the result with another verified channel under controlled conditions.

Q6: What should buyers confirm before ordering the AAT145-S50?

Confirm the full model code, 16-channel requirement, TC/mV signal types, terminal board, KS1 cable, and redundancy architecture. Also check the required thermocouple types and operating environment.

Q7: Does the AAT145-S50 include a 12-month warranty?

Yes. Ubest provides a 12-month warranty under the agreed sales terms. Contact our team for warranty details and after-sales assistance.

Request a Quote for Yokogawa AAT145-S50

Looking for a Yokogawa AAT145-S50 TC/mV Input Module for your control system?

Contact Ubest for pricing, stock availability, technical confirmation, and international shipping options.

• Website: ubestplc.com
• Email: sales@ubestplc.com
• Shipping: FedEx, UPS, and DHL
• Warranty: 12 Months

Send us your model number and project requirements. Our team will help verify the correct module for your application.

Tags