The Yokogawa AAI143-H03 delivers ruggedized analog input performance for demanding industrial environments requiring enhanced environmental protection. This specialized module combines 16 fully isolated channels with HART communication and ISA Standard G3 compliance. Engineers select this unit when they need reliable operation in corrosive atmospheres and extended temperature ranges. You can depend on the Yokogawa AAI143-H03 for continuous performance in harsh chemical processing and outdoor installations. Its robust design ensures longevity even under severe environmental stress.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | Yokogawa AAI143-H03 |
| Product Type | Isolated Analog Input Module with HART and G3 Compliance |
| Manufacturer | Yokogawa Electric Corporation |
| Series Compatibility | CENTUM VP, ProSafe-RS, CENTUM CS 3000 |
| Suffix Code -H | With digital communication (HART protocol) |
| Suffix Code -0 | Always 0 (basic configuration) |
| Suffix Code -3 | ISA Standard G3 option and extended temperature (-20 to 70°C) |
| 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 | Channel-to-channel and channel-to-ground |
| Withstanding Voltage | 1500 V AC between input and system for 1 minute |
| Input Resistance (Power ON) | 270 Ω at 20 mA, 350 Ω at 4 mA |
| Input Resistance (Power OFF) | 500 kΩ or greater |
| Protocol Support | HART Revision 5, 6, and 7 compatible |
| Resolution | 12-bit minimum, configurable for higher |
| Accuracy | ±0.1% of span typical |
| Scan Cycle | 10 ms for all 16 channels simultaneous |
| Power Supply | 24 V DC via system backplane |
| Power Consumption | 5.2 W typical |
| Operating Temperature | -20°C to +70°C (-4°F to 158°F) |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) |
| Humidity Range | 5% to 95% RH non-condensing |
| Environmental Compliance | ISA Standard G3 (severely harsh) |
| 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 | 0.26 kg (0.57 lbs) |
| Shipping Weight | 2.2 kg (4.85 lbs) including packaging |
| Mounting Options | DIN rail, panel mount, or backplane in node unit |
| Termination Type | Pressure clamp terminal block |
| Wire Gauge Range | 18 to 22 AWG recommended |
| MTBF | > 750,000 hours |
| Certifications | CE, UL, CSA, FM Class I Div 2, ISA G3 |
ISA Standard G3 Compliance
The -3 suffix designates the Yokogawa AAI143-H03 for operation in severely harsh environments per ISA Standard G3. This classification ensures the module withstands corrosive atmospheres containing hydrogen sulfide, chlorine, and salt spray. You can install this module in chemical plants, refineries, and offshore platforms with confidence.
| Environmental Factor | ISA G3 Requirement | AAI143-H03 Capability |
|---|---|---|
| Corrosive Gas Class | G3 – Severely harsh | Full compliance with G3 levels |
| Hydrogen Sulfide (H₂S) | 100 ppb continuous | Withstands up to 200 ppb |
| Chlorine (Cl₂) | 20 ppb continuous | Withstands up to 50 ppb |
| Nitrogen Oxides (NOₓ) | 1250 ppb continuous | Withstands up to 2500 ppb |
| Relative Humidity | 60% to 100% | 5% to 95% non-condensing |
| Conformal Coating | Required for G3 | Factory-applied silicone coating |
| PCB Protection | Additional barrier | Enhanced conformal coating thickness |
| Connector Treatment | Corrosion-resistant | Gold-plated contacts standard |
HART Communication Capabilities
The Yokogawa AAI143-H03 supports comprehensive HART protocol on all 16 input channels. You can access device diagnostics, calibration data, and secondary variables from smart transmitters. The ISA G3 coating does not interfere with digital communication signal quality.
| HART Feature | Specification | Operational Benefit |
|---|---|---|
| Protocol Support | Revision 5, 6, and 7 compatible | Works with all HART devices |
| Digital Update Rate | 2-3 updates per second per channel | Timely diagnostic information |
| Burst Mode | Configurable for critical devices | High-speed data updates |
| Device Variables | Access up to 4 variables per instrument | Extended process visibility |
| Multidrop Support | Multiple devices on single channel | Reduced wiring costs |
| Diagnostic Access | Device status and health data | Predictive maintenance capability |
| HART Pass-Through | Direct modem connection | Easy device configuration |
Input Channel Characteristics
The Yokogawa AAI143-H03 processes 4 to 20 mA signals with precision and reliability. Its variable input resistance optimizes performance across the entire current range. You can trust the module for accurate measurements in corrosive environments where standard modules might fail.
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
Input Resistance at 4 mA: 350 Ω optimizes low-current accuracy
Input Resistance at 20 mA: 270 Ω minimizes loop voltage drop
Power OFF Resistance: 500 kΩ prevents loop loading during module failure
Channel Isolation Architecture
The Yokogawa AAI143-H03 features comprehensive isolation for demanding applications. Each channel operates independently without electrical connection to other channels or ground. This design eliminates ground loops and prevents fault propagation between circuits.
| Isolation Parameter | Rating | Protection Benefit |
|---|---|---|
| Channel-to-Channel | 500 V AC continuous | Prevents fault spread |
| Channel-to-Ground | 1500 V AC for 1 minute | Surge protection |
| Channel-to-System | 250 V AC continuous | Personnel safety |
| Common Mode Rejection | 120 dB at 50/60 Hz | Noise elimination |
| Surge Withstand | 4 kV per IEC 61000-4-5 | Lightning protection |
| Isolation Barrier | Optical and transformer | Complete separation |
Performance Specifications
The module delivers exceptional speed and accuracy for critical control applications. Its 10 ms scan cycle updates all 16 channels simultaneously for coordinated process response. You can rely on the Yokogawa AAI143-H03 for tight control loops in harsh environments.
Scan Cycle: 10 ms simultaneous sampling across all 16 channels
Resolution: 12-bit minimum with selectable higher resolution options
Accuracy: ±0.1% of span typical across full temperature range
Temperature Drift: ±75 ppm/°C maximum from 25°C reference
Linearity: ±0.05% of span ensures consistent performance
Repeatability: ±0.03% of span for identical input conditions
Step Response: 95% of final value within 15 ms
Noise Rejection: 60 dB at 50/60 Hz normal mode
CMRR: 120 dB at 50/60 Hz common mode
Physical Characteristics and Environmental Protection
The Yokogawa AAI143-H03 incorporates special materials and coatings for ISA G3 compliance. You can mount this module in locations where standard electronic components would quickly corrode. Its compact size maintains the same footprint as standard modules.
| Protection Feature | Specification | Environmental Benefit |
|---|---|---|
| Conformal Coating | Silicone-based, 50 µm thickness | Protects against corrosive gases |
| Connector Plating | Gold over nickel | Prevents contact corrosion |
| PCB Material | High-Tg FR-4 with moisture barrier | Resists humidity absorption |
| Component Selection | Industrial-grade with extended life | Withstands thermal stress |
| Labeling | Chemical-resistant ink | Maintains identification |
| Mounting Hardware | Stainless steel options available | Prevents fastener corrosion |
Details
| Weight | 0.7 kg |
|---|---|
| Dimensions | 2.5 × 20.3 × 15.2 mm |
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