The Yokogawa AAI143 provides exceptional signal isolation for critical industrial process control applications. This high-performance input module integrates seamlessly with CENTUM VP and ProSafe-RS systems for reliable data acquisition. Engineers select this unit when they require complete electrical isolation between field signals and the control system. You can depend on the Yokogawa AAI143 for accurate measurements in electrically noisy environments. Its robust isolation architecture prevents ground loops and protects sensitive electronics.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | Yokogawa AAI143 |
| Product Type | Isolated Analog Input Module |
| Manufacturer | Yokogawa Electric Corporation |
| Series Compatibility | CENTUM VP, ProSafe-RS, CENTUM CS 3000 |
| Number of Channels | 16 fully isolated inputs |
| Input Signal Type | 4 to 20 mA DC current loop |
| Allowable Input Current | 24 mA maximum |
| Channel Isolation | Fully isolated channels (each channel independent) |
| Withstanding Voltage | 1500 V AC between input and system for 1 minute |
| Input Resistance (Power ON) | 270 Ω at 20 mA to 350 Ω at 4 mA |
| Input Resistance (Power OFF) | 500 kΩ or greater |
| Accuracy | ±16 µA |
| Resolution | 16 bits |
| Sampling Rate | 100 samples per second |
| Response Time | 20 ms including digital filtering |
| Power Consumption | 4.5 W typical |
| Power Supply Voltage | 5 V DC from backplane |
| Operating Temperature | -10°C to +55°C (14°F to 131°F) |
| Storage Temperature | -20°C to +70°C (-4°F to 158°F) |
| Dimensions (H x W x D) | 130 mm x 30 mm x 115 mm (5.12 x 1.18 x 4.53 inches) |
| Net Weight | 0.25 kg (0.55 lbs) |
| Shipping Weight | 2.1 kg (4.63 lbs) including packaging |
| Termination Type | Pressure clamp terminal block |
| Wire Gauge Range | 18 to 22 AWG recommended |
| MTBF | > 800,000 hours |
| Certifications | CE, UL, CSA, FM Class I Div 2 |
Channel Isolation Architecture
The Yokogawa AAI143 features true channel-to-channel isolation for maximum signal integrity. Each of the 16 inputs operates independently without electrical connection to other channels. This design eliminates ground loops and prevents fault propagation between circuits. You can connect field devices with different ground potentials without concern.
| Isolation Parameter | Value | Condition |
|---|---|---|
| Channel-to-Channel Isolation | 500 V AC continuous | Between any two channels |
| Channel-to-System Isolation | 1500 V AC for 1 minute | Dielectric withstand test |
| Channel-to-System Isolation | 250 V AC continuous | Working voltage |
| Common Mode Voltage | ±200 V DC maximum | Between channel and ground |
| Isolation Barrier | Optical isolation | Digital signal transmission |
| Creepage Distance | 8 mm minimum | PCB design compliance |
Input Resistance Characteristics
The Yokogawa AAI143 employs a unique input circuit with variable resistance characteristics. This design optimizes performance across the entire 4 to 20 mA range. You benefit from accurate signal conversion regardless of loop current.
| Operating Condition | Input Resistance | Application Impact |
|---|---|---|
| Power ON at 4 mA | 350 Ω | Higher impedance at low current |
| Power ON at 12 mA | 310 Ω | Mid-range impedance |
| Power ON at 20 mA | 270 Ω | Lower impedance at full scale |
| Power OFF or Failure | >500 kΩ | Minimal loading on loop |
| Loop Power Requirement | 7.5 V DC minimum | Voltage drop at 20 mA |
| Compliance Voltage | 12 to 30 V DC | External power supply range |
Current Input Specifications
This module excels at processing 4 to 20 mA signals with exceptional precision. The Yokogawa AAI143 achieves ±16 µA accuracy across the full input range. You can trust this performance for demanding applications like custody transfer and critical process control.
Nominal Range: 4 to 20 mA DC corresponds to 0 to 100 percent input span
Zero Scale: 4 mA represents 0 percent of measured value
Full Scale: 20 mA represents 100 percent of measured value
Overrange Capability: 20 to 24 mA accommodates process upsets
Maximum Safe Current: 24 mA ensures no damage from transient spikes
Accuracy: ±16 µA maintains precision for tight control loops
Resolution: 16 bits provides 65,536 steps across the input range
Temperature Drift: ±50 ppm/°C maintains accuracy across temperature swings
Linearity: ±0.01% of span ensures consistent performance
Physical Characteristics and Installation
The Yokogawa AAI143 features a compact design that maximizes cabinet space utilization. Its isolated architecture requires careful wiring practices for optimal performance. You can mount this module in standard Yokogawa I/O racks alongside other modules.
Module Dimensions: 130 mm height fits standard sub-racks
Width: 30 mm allows high-density installation with 16 isolated channels
Depth: 115 mm accommodates standard enclosure depths
Panel Space: Requires minimal room for mounting and airflow
Connector Location: Front-facing terminal block for easy access
LED Indicators: Channel status, module health, and communication activity
Wiring Separation: Maintain separation from high-voltage circuits
Shield Termination: Connect shields at field device or module per plan
Isolation Benefits for Industrial Applications
The 1500 V AC withstanding voltage makes the Yokogawa AAI143 ideal for demanding environments. This high isolation level protects control system electronics from transient surges. You gain confidence when connecting to field devices in high-voltage areas.
Lightning Protection: Isolation withstands induced surges from nearby strikes
Ground Loop Elimination: Breaks unintended current paths between devices
Noise Immunity: Prevents electrical noise from corrupting measurement signals
Fault Containment: Limits damage to individual channels during failures
Safety Isolation: Protects operators from hazardous voltages
Transformer Coupling: Provides energy for isolated side circuits
Details
| Weight | 0.7 kg |
|---|---|
| Dimensions | 2.5 × 20.3 × 15.2 mm |
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