AI835A Thermocouple Input Module | 8-Channel ABB

ABB AI835/AI835A Thermocouple Input Module: Advanced Temperature Measurement

The ABB AI835/AI835A Thermocouple Input Module delivers precision temperature monitoring with advanced cold junction compensation. This high-resolution module features eight differential inputs and supports multiple thermocouple types for industrial applications.

Advanced Input Capabilities

• Eight differential input channels for superior noise rejection
• Supports -30 mV to +75 mV linear voltage measurements
• Compatible with thermocouple types B, C, E, J, K, N, R, S, T
• AI835A additionally supports types D, L, and U thermocouples
• Channel 8 configurable as Cold Junction compensation channel
• Cold junction measurement via 4-wire Pt100 RTD
• Flexible CJ measurement locally or on distant connection units

High-Precision Specifications

• 15-bit resolution A/D converter for exceptional accuracy
• Input impedance greater than 1 MΩ for minimal loading
• Maximum error of 0.1% for reliable measurements
• Low temperature drift: typical 5 ppm/°C, maximum 7 ppm/°C
• Update cycle: 280 + 80 × (active channels) ms at 50 Hz
• Faster update: 250 + 70 × (active channels) ms at 60 Hz
• Excellent CMRR of 120 dB and NMRR > 60 dB

Technical Specifications

• Maximum field cable length: 600 meters (656 yards)
• Power dissipation: 1.6 W for efficient operation
• Current consumption: 75 mA from +5V Modulebus
• Additional 50 mA from +24V Modulebus supply
• Dielectric test voltage: 500 V AC for insulation safety
• Rated insulation voltage: 50 V
• Group-wise isolation from ground for enhanced safety
• Compact S800 mechanics with 45mm width

Environmental Ratings

• Operating temperature: 0 to +55°C (32 to 131°F)
• Storage temperature: -40 to +70°C (-40 to 158°F)
• Relative humidity: 5 to 95% non-condensing
• IP20 protection rating per IEC 60529 standard
• ISA-S71.04 G3 corrosion protection level
• Pollution degree 2 per IEC 60664-1
• Suitable for harsh industrial environments

System Integration

• Compatible with MTU models: TU810, TU812, TU814, TU818, TU830, TU833
• Keying code BA ensures proper module insertion
• Compact dimensions: 45mm × 102mm × 119mm (W×D×H)
• Lightweight design: 0.22 kg (0.49 lbs)
• Article number: 3BSE051306R1 for easy identification
• Seamless integration with ABB S800 I/O system
• Standard industrial installation procedures

Frequently Asked Questions (FAQ)

• What thermocouple types does the AI835/AI835A support?
  The module supports types B, C, E, J, K, N, R, S, T, with AI835A adding D, L, and U types.
• How does the cold junction compensation work?
  Channel 8 can be configured as a CJ channel using 4-wire Pt100 RTD to measure ambient temperature.
• What is the resolution of the A/D converter?
  The AI835/AI835A features high 15-bit resolution for precise temperature measurements.
• Can all eight channels be used for temperature measurement?
  Yes, though channel 8 is typically used for CJ compensation, it can function as a standard input when needed.
• What is the maximum update rate?
  Update time depends on active channels: 280ms + 80ms per channel at 50Hz, or 250ms + 70ms per channel at 60Hz.

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