YOKOGAWA AAI141-H00/K4A00

Description

1. Product Overview

2. Product Parameters

2.1 Core Input Specifications

• Number of Channels: 16 single-ended analog inputs (isolated per channel)
• Supported Input Signals:
  • Current: 4–20 mA DC, 0–20 mA DC
  • Voltage: 0–5 V DC, 1–5 V DC, 0–10 V DC
• Resolution: 16-bit (for all input types)
• Accuracy: ±0.05% of full scale (FS) at 25°C; ±0.1% FS over operating temperature range
• Sampling Rate: 100 ms per channel (scan time)
• Input Impedance: 1 MΩ (voltage inputs), 250 Ω (current inputs)

2.2 Electrical Parameters

• Power Supply: 24 VDC ±10% (from DCS backplane)
• Power Consumption: ≤12 W (full channel load)
• Isolation: 2500 VAC between channels, 2500 VAC between inputs and backplane
• Overvoltage Protection: 30 V DC (input channels)
• Reverse Polarity Protection: Yes (current inputs)

2.3 Environmental & Mechanical Parameters

• Operating Temperature: 0°C to +55°C
• Storage Temperature: -20°C to +70°C
• Relative Humidity: 5%–95% (non-condensing, no dew formation)
• Protection Rating: IP20 (rack-mounted)
• Dimensions: 100 mm × 260 mm × 45 mm (L×W×H)
• Mounting: Yokogawa CENTUM VP/CS 3000 I/O racks

2.4 Certification & Compatibility

• Certifications: CE, UL 61010-1, ATEX II 2G Ex ib IIC T4, IECEx, SIL 2 (per IEC 61508)
• Compatible Systems: Yokogawa CENTUM VP DCS, CENTUM CS 3000 DCS, ProSafe-RS safety system
• Diagnostic Features: Open-circuit detection, overrange/underrange alerts, channel fault indicators

3. Advantages & Features

1. High-Accuracy Signal Conversion: YOKOGAWA AAI141-H00/K4A00 delivers ±0.05% FS accuracy, ensuring precise measurement of critical process parameters (e.g., pressure, temperature) for optimal control and safety.
2. Channel-to-Channel Isolation: Each input channel of YOKOGAWA AAI141-H00/K4A00 is isolated with 2500 VAC, preventing cross-talk and protecting the module from ground loops or voltage spikes in industrial environments.
3. Hot-Swappable Design: YOKOGAWA AAI141-H00/K4A00 can be replaced or installed while the DCS is running, eliminating downtime for maintenance and improving system availability.
4. Comprehensive Diagnostics: Built-in fault detection (open circuits, overrange) and LED indicators on YOKOGAWA AAI141-H00/K4A00 simplify troubleshooting, reducing the time to resolve issues and minimize process disruptions.
5. Broad Signal Compatibility: Support for multiple current and voltage input types makes YOKOGAWA AAI141-H00/K4A00 versatile for integration with a wide range of industrial sensors and transmitters.

4. Application Fields & Cases

4.1 Application Fields

• Oil & Gas: Pipeline pressure/temperature monitoring, refinery distillation column control, offshore platform process monitoring
• Chemical Processing: Reactor temperature/pressure control, batch process monitoring, polymer production line sensing
• Power Generation: Boiler water level monitoring, turbine lube oil pressure sensing, steam flow measurement
• Pharmaceuticals: Bioreactor pH/DO monitoring, filling line flow control, cleanroom environmental sensing

4.2 Typical Cases

1. Refinery Distillation Control: A major oil refinery integrated YOKOGAWA AAI141-H00/K4A00 into its CENTUM VP DCS to monitor temperature and pressure signals from distillation columns. The module’s high accuracy enabled tight control of separation processes, increasing product yield by 4%.
2. Chemical Reactor Monitoring: A specialty chemical manufacturer used YOKOGAWA AAI141-H00/K4A00 to process 4–20 mA signals from reactor pressure and level sensors. The module’s channel isolation prevented signal interference from nearby motors, ensuring reliable process data and reducing downtime by 15%.
3. Power Plant Boiler Control: A coal-fired power plant deployed YOKOGAWA AAI141-H00/K4A00 to monitor boiler water level and steam pressure. The hot-swappable design allowed replacement of a faulty module during operation, avoiding a costly plant shutdown.

5. Competitor Comparison

6. Selection Suggestions & Precautions

6.1 Selection Suggestions

1. Signal Type Matching: YOKOGAWA AAI141-H00/K4A00 supports both current and voltage inputs; for thermocouple/RTD inputs, select Yokogawa AAI143-H00 (specialized temperature input module).
2. System Compatibility: Verify compatibility with CENTUM VP/CS 3000 DCS racks before installation; use Yokogawa’s Engineering Environment software for channel configuration.
3. Environmental Needs: Choose the ATEX/IECEx-certified version for hazardous areas (e.g., refineries, chemical plants); standard versions are suitable for non-hazardous environments.

6.2 Precautions

1. Wiring Guidelines: Use shielded twisted-pair cables for analog inputs, with shielding grounded at the sensor end to eliminate ground loops. Tighten terminal screws to 0.5 N·m to prevent signal loss.
2. Calibration Requirements: Calibrate YOKOGAWA AAI141-H00/K4A00 annually using a precision signal generator (e.g., Yokogawa CA700) to maintain accuracy; recalibrate after sensor or wiring changes.
3. Installation Safety: Ensure the DCS rack is powered off before initial installation (hot-swapping only for replacement); avoid installing the module near high-voltage equipment to minimize EMI.
4. Fault Handling: Address open-circuit or overrange faults immediately—these may indicate sensor failure or wiring issues that could compromise process control.

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