YOKOGAWA AAI143

Description

1. Product Overview

2. Product Parameters

2.1 Core Temperature Input Specifications

• Number of Channels: 16 single-ended inputs (isolated per channel)
• Supported Sensors:
  • Thermocouples: Type J, K, T, E, R, S, B, N
  • RTDs: PT100 (2/3/4-wire), PT1000, Ni100, Ni1000
  • Thermistors: 10 kΩ (NTC)
• Temperature Measurement Ranges:
  • Thermocouples: -200°C to +1800°C (varies by type)
  • RTDs: -200°C to +600°C
  • Thermistors: -50°C to +150°C
• Resolution: 16-bit (all sensor types)
• Accuracy:
  • RTDs: ±0.1°C (0°C to +100°C), ±0.2°C (-200°C to 0°C / +100°C to +600°C)
  • Thermocouples: ±0.5°C (0°C to +1000°C), ±1.0°C (outside core range)
• Sampling Rate: 200 ms per channel (scan time)
• Cold Junction Compensation: Built-in (±0.5°C accuracy, -10°C to +60°C)

2.2 Electrical Parameters

• Power Supply: 24 VDC ±10% (from DCS backplane)
• Power Consumption: ≤15 W (full channel load)
• Isolation: 2500 VAC between channels, 2500 VAC between inputs and backplane
• Overvoltage Protection: 30 V DC (input channels)
• Excitation Current: 1 mA (for 2/3-wire RTDs), 0.5 mA (for 4-wire RTDs)

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 in control cabinet)
• Dimensions: 100 mm × 260 mm × 45 mm (L×W×H)
• Mounting: Yokogawa CENTUM VP/CS 3000 I/O racks (7-slot or 14-slot)

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, sensor fault detection, cold junction failure alerts
• Software Compatibility: CENTUM VP Engineering Environment (CEE), Exaquantum PIM

3. Advantages & Features

1. Specialized Temperature Sensing: YOKOGAWA AAI143 is optimized for thermocouple/RTD inputs with built-in cold junction compensation, eliminating the need for external compensation modules and reducing system complexity.
2. High Accuracy & Stability: With ±0.1°C accuracy for PT100 RTDs (core range), YOKOGAWA AAI143 ensures reliable temperature measurement for critical processes (e.g., chemical reactor control, power plant boiler monitoring).
3. Channel-to-Channel Isolation: 2500 VAC isolation between channels protects YOKOGAWA AAI143 from ground loops and electrical interference, ensuring signal integrity in noisy industrial environments (e.g., near motors or VFDs).
4. Hot-Swappable Design: YOKOGAWA AAI143 can be replaced or installed while the DCS is operational, minimizing downtime for maintenance and improving overall system availability.
5. Comprehensive Diagnostics: Real-time fault detection (open circuits, sensor failures) and LED indicators on YOKOGAWA AAI143 simplify troubleshooting, allowing maintenance teams to resolve issues quickly and prevent process disruptions.

4. Application Fields & Cases

4.1 Application Fields

• Oil & Gas: Refinery furnace temperature monitoring, pipeline heat tracing control, offshore platform process temperature sensing
• Chemical Processing: Reactor temperature control, distillation column temperature monitoring, polymer production line thermal profiling
• Power Generation: Boiler tube temperature monitoring, turbine lube oil temperature sensing, steam condenser temperature control
• Pharmaceuticals: Bioreactor temperature regulation, lyophilization (freeze-drying) process monitoring, cleanroom environmental temperature tracking
• Food & Beverage: Pasteurization temperature control, oven/cooker temperature monitoring, refrigeration system temperature sensing

4.2 Typical Cases

1. Power Plant Boiler Monitoring: A 600 MW coal-fired power plant integrated YOKOGAWA AAI143 into its CENTUM VP DCS to monitor boiler tube and superheater temperatures (Type K thermocouples). The module’s high accuracy and cold junction compensation enabled early detection of overheating, preventing tube failures and unplanned outages.
2. Chemical Reactor Control: A specialty chemical manufacturer used YOKOGAWA AAI143 to track reactor temperatures (PT100 RTDs) during batch polymerization. The module’s channel isolation eliminated signal interference from nearby agitator motors, ensuring precise temperature control and consistent product quality.
3. Pharmaceutical Lyophilization Process: A biopharmaceutical plant deployed YOKOGAWA AAI143 to monitor freeze-drying chamber temperatures (Type T thermocouples). The hot-swappable design allowed replacement of a faulty module during a production run, avoiding costly batch losses.

5. Competitor Comparison

6. Selection Suggestions & Precautions

6.1 Selection Suggestions

1. Sensor Type Matching: YOKOGAWA AAI143 supports thermocouples, RTDs, and thermistors—select the module for applications requiring mixed temperature sensor types; for current/voltage inputs, choose Yokogawa AAI141.
2. Hazardous Area Requirements: Opt for the ATEX/IECEx-certified version of YOKOGAWA AAI143 for installation in explosive environments (e.g., refineries, chemical plants); standard versions are suitable for non-hazardous areas.
3. System Scale: YOKOGAWA AAI143 (16 channels) is ideal for large-scale temperature monitoring systems; for smaller applications (≤8 channels), select Yokogawa AAI145 (8-channel temperature input module).

6.2 Precautions

1. Wiring Guidelines: Use twisted-pair shielded cables for thermocouple/RTD connections; ground shielding at the sensor end to eliminate ground loops. For 4-wire RTDs, ensure equal wire resistance to maintain accuracy.
2. Calibration Requirements: Calibrate YOKOGAWA AAI143 annually using a precision temperature calibrator (e.g., Yokogawa CA753) to verify accuracy; recalibrate after sensor or wiring changes.
3. Installation Safety: Ensure the DCS rack is powered off for initial installation (hot-swapping only for replacement); mount YOKOGAWA AAI143 at least 30 cm away from high-voltage equipment (e.g., contactors) to minimize EMI.
4. Cold Junction Maintenance: Keep the module’s cold junction area (internal) free from dust and debris to maintain compensation accuracy; avoid installing YOKOGAWA AAI143 near heat sources (e.g., power supplies) that could affect cold junction temperature.

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