Yokogawa AAI143-S50

Technical & Performance Parameters

• Input Channel Quantity: 16 independent galvanic isolation 4–20 mA input channels
• A/D Conversion Resolution: 16-bit
• Standard Measurement Accuracy: ±0.1% FS @ 25°C ambient temperature
• Full Temperature Zone Accuracy Deviation: ±0.2% FS (-20°C ~ +70°C)
• Transmitter Loop Power Supply Output: 19.0 V ~ 25.5 V DC two-wire transmitter power supply
• Channel-System Isolation Withstand Voltage: 1500 V AC, 1 minute insulation withstand test
• Signal Sampling Update Period: Configurable 10 ms ~ 1 s software sampling cycle
• No HART Digital Communication Modem Circuit Built-in
• Module Power Consumption: 4.8 W @ 24 V DC backplane power supply
• Operating Temperature Range: -20 °C ~ +70 °C
• Humidity Tolerance: 5%–95% RH non-condensing environment
• Physical Dimensions: 30 mm (W) × 180 mm (H) × 140 mm (D)
• Net Weight: 0.45 kg
• Certifications: CE, UL industrial safety certification

Material Composition

1. Outer shell: Flame retardant black engineering plastic injection molding frame
2. Main PCB board: Low-noise multi-layer FR4 circuit board
3. Channel isolation component: Independent miniature isolation transformer per channel
4. Terminal connection interface: Standard TB37G/TB38G spring clamp terminal base interface
5. Loop power components: Independent low ripple DC-DC power supply for each channel
6. Signal filtering components: Low-temperature drift metal film resistors and polypropylene filtering capacitors

Structural Characteristics

1. 16-channel high-density single-module layout, maximum reduce DCS cabinet slot occupation quantity
2. Front panel equipped with 16-channel independent signal status LED running indicator, red light alarm for single channel fault
3. Standard TB series terminal base matching structure, compatible with all Yokogawa CS3000 and VP system wiring terminals
4. No reserved HART communication chip and circuit space, reduce internal component quantity and equipment cost
5. Vertical air convection heat dissipation channel reserved between circuit board and front panel
6. Double anti-vibration locking buckles on both sides, prevent module loosening caused by cabinet long-term vibration

Working Principle

1. Ordinary two-wire 4–20 mA analog transmitters connect to module channels through TB37G/TB38G terminal base
2. Module internal isolated power supply provides stable 19–25.5 V DC loop power for each field transmitter
3. Analog current signal passes through isolation transformer to eliminate ground loop interference between field side and DCS system
4. Signal conditioning circuit filters industrial frequency interference noise and adjusts signal amplitude to match A/D input range
5. 16-bit A/D converter converts continuous analog current signal into discrete digital measurement data
6. On-board communication chip transmits digital measurement data to CENTUM main controller via ESB internal system bus according to configured sampling cycle
7. Built-in self-diagnosis circuit detect channel open circuit (<0.65 mA) and over-range (>24 mA) faults, trigger corresponding channel red alarm LED

Core Function Features

1. 16-channel high-density analog signal acquisition, reduce cabinet module configuration quantity and project cost
2. Full-channel independent galvanic isolation, zero crosstalk between different field measurement loops
3. Stable 19–25.5 V DC loop power supply output, compatible with all standard industrial two-wire transmitters
4. Software configurable sampling cycle, adapt to fast flow/pressure signal and slow temperature signal measurement
5. High 1500 V AC insulation withstand voltage, strong anti-electromagnetic interference performance
6. ESB dedicated DCS bus communication, seamless data interaction with Yokogawa CENTUM control system
7. Support dual redundant hot backup configuration for high-reliability process control systems

Advantage Highlights

1. Cost-effective standard model, remove HART communication circuit to reduce equipment procurement cost for general measurement projects
2. High channel density design, effectively save DCS cabinet space and wiring engineering workload
3. Wide full-temperature stable measurement accuracy, adapt to factory all-season temperature fluctuation environment
4. Compatible with all existing Yokogawa TB series terminal bases, no additional wiring adapter required
5. Simple internal circuit structure, low component failure rate and long service life
6. CE and UL safety certification, meet global industrial project standard access requirements

Applicable Industries

Installation Requirements

1. Insert into dedicated analog input slot of Yokogawa CENTUM CS3000 or VP backplane, lock side buckles tightly
2. Install matched TB37G or TB38G terminal base below module for field transmitter wiring
3. Field signal wiring uses shielded twisted pair cable, single-point grounding of shielding layer inside DCS control cabinet
4. Keep ≥10 mm heat dissipation gap between adjacent modules to ensure air circulation cooling
5. For explosion hazardous area application, install matched isolation safety barrier on front end of each signal channel
6. Cabinet internal ambient temperature must be controlled within -20°C ~ +70°C operating range

Usage Precautions

1. Strictly prohibit input of AC high voltage signal into channel terminals, will damage internal isolation transformer
2. Do not reverse connect 24 V DC backplane power supply terminal, permanent damage to module internal power circuit
3. Regularly clean terminal base dust every 6 months to prevent poor wiring contact and measurement deviation
4. This model S50 has no HART communication function, cannot read or write parameters of smart HART transmitters
5. Do not disassemble plastic outer shell without authorization, internal channel isolation circuit will be destroyed
6. When channel fault alarm occurs, first check field transmitter wiring continuity before replacing module