Yokogawa AAI141

Technical & Performance Parameters

• Input Channel Quantity: 8 independent galvanic isolation channels
• A/D Conversion Resolution: 16-bit high precision
• Basic Measurement Accuracy: ±0.1% FS @ 25°C ambient temperature
• Full Temperature Zone Accuracy Deviation: ±0.2% FS (-20°C ~ +70°C)
• Supported Input Signal Types: 4–20 mA DC, 0–10 V DC, K/E/J/T thermocouple, Pt100 RTD
• Channel Isolation Withstand Voltage: 500 V AC between channel and system bus, 1 minute withstand test
• Built-in CJC Cold Junction Compensation Accuracy: ±1°C
• Signal Sampling Period: 125 ms–1 s software configurable
• Common Mode Rejection Ratio: ≥120 dB @ 50/60 Hz industrial frequency interference
• Module Power Consumption: 540 mA @ 24 V DC backplane power supply
• Operating Temperature Range: -20 °C ~ +70 °C
• Humidity Working Range: 5%–95% RH non-condensing
• Physical Dimensions: 30 mm (W) × 180 mm (H) × 140 mm (D)
• Net Weight: 0.3 kg
• Certifications: CE, UL safety certification

Material Composition

1. Module outer frame: Black flame retardant engineering plastic injection molding shell
2. Main PCB substrate: Low-temperature drift FR4 multi-layer circuit board
3. Isolation components: Channel independent miniature signal isolation transformer
4. Terminal connector: Phosphor bronze gold-plated spring terminal clamp
5. Cold junction compensation component: High-precision platinum temperature sensing chip
6. Internal passive components: Low-temperature drift metal film precision resistors, polyester filtering capacitors

Structural Characteristics

1. Standard Yokogawa CENTUM system backplane pluggable card structure, hot-swap maintenance supported
2. Front panel independent channel signal LED indicator light, single channel fault red light alarm
3. Separate terminal wiring base TB37G/TB38G matched installation, wiring space reserved for each channel
4. Internal independent signal conditioning circuit for each channel, no shared analog processing components
5. Vertical heat dissipation channel reserved between front panel and circuit board, avoid heat accumulation
6. Anti-slip locking buckle on both sides of module, fixed after inserting backplane to prevent vibration loosening

Working Principle

1. Field temperature, pressure, flow analog signals enter each independent isolation channel through matched TB37G terminal base
2. Isolation transformer cut off ground loop interference between field equipment and DCS control system
3. Thermocouple signal input channel activates built-in CJC cold junction compensation chip to eliminate cold end temperature measurement error
4. Precision signal conditioning circuit filter industrial frequency interference and amplify weak sensor signals
5. 16-bit A/D converter converts analog measurement signals into digital data
6. On-board communication chip transmits digital measurement data to CENTUM main controller via ESB internal system bus
7. Real-time self-diagnosis circuit detect channel open circuit, short circuit and over-range signal faults, trigger front panel channel alarm indicator

Core Function Features

1. Universal multi-signal compatible input, single module support current, voltage, thermocouple and RTD temperature sensors
2. Independent galvanic isolation for every channel, eliminate cross-channel signal crosstalk
3. Built-in high-precision cold junction compensation circuit for thermocouple measurement
4. High common mode rejection ratio ≥120 dB, strong suppression of on-site industrial frequency electromagnetic interference
5. Software configurable sampling period, adapt to fast response pressure signal and slow response temperature signal measurement
6. ESB dedicated DCS bus communication, high-speed stable data transmission with Yokogawa CENTUM control system
7. Support dual redundant backup configuration for high-reliability safety instrument systems

Advantage Highlights

1. Universal multi-signal compatibility, reduce DCS cabinet different module types and save cabinet space
2. Full-channel independent isolation, zero interference between different types of field sensor signals
3. Ultra-low full-temperature measurement deviation, stable precision under factory seasonal temperature change
4. Compact thin thickness design, high cabinet module installation density
5. Standard matched TB37G/TB38G terminal base with lightning protection optional configuration
6. CE and UL international safety certification, meet petrochemical explosion hazardous area control cabinet standard

Applicable Industries

Installation Requirements

1. Insert into dedicated analog input slot of Yokogawa CENTUM CS3000 / VP backplane, lock side buckle tightly
2. Matched TB37G or TB38G terminal base must be installed below module for field signal wiring
3. Field sensor wiring uses shielded twisted pair cable, shielding layer single-point grounding inside DCS cabinet
4. Reserve ≥10 mm heat dissipation gap between adjacent modules to ensure air circulation
5. For intrinsically safe explosion-proof area application, matched isolation safety barrier must be installed on front end of signal wiring
6. Ambient cabinet temperature must be controlled within -20°C ~ +70°C operating range, install cooling fan for high-temperature workshop

Usage Precautions

1. Do not input over-range voltage/current signal into channel, will damage internal signal conditioning circuit
2. Thermocouple wiring must use dedicated temperature compensation cable, ordinary copper wire causes large measurement error
3. Strictly prohibit reverse connection of 24 V DC backplane power supply terminal, permanent damage to module power circuit
4. Do not disassemble plastic shell without authorization, internal isolation circuit structure will be destroyed
5. Regularly clean terminal base dust every 6 months to prevent poor wiring contact
6. When single channel alarm occurs, first check field sensor wiring continuity before replacing module