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ABB AI835A Thermocouple/mV Input Module 

Product Overview

The ABB AI835A is an advanced 8-channel analog input module designed for precise temperature and voltage signal acquisition in industrial automation and control systems. This high-performance module provides exceptional measurement accuracy for thermocouple and millivolt signals in harsh industrial environments .

Technical Specifications

General Parameters

• Brand: ABB

• Model: AI835A (3BSE051306R1)

• Type: Thermocouple/mV input module

• Channels: 8 isolated differential inputs

• Resolution: 15-bit (A/D conversion)

• Input Types:

  • Thermocouples: Types B, C, D, E, J, K, L, N, R, S, T, U

  • Voltage: -30mV to +75mV linear

• Sampling Rate: 100 Hz per channel

• Input Impedance: >1 MΩ

• Isolation: Group isolation from ground (500V AC test voltage)

• Accuracy: Maximum 0.1% error

• Temperature Drift: Typical 5 ppm/°C, maximum 7 ppm/°C

• Update Cycle Time:

  • 280 + 80*(active channels) ms at 50Hz

  • 250 + 70*(active channels) ms at 60Hz

• Max Field Cable Length: 600 meters (656 yards)

• CMRR: 120 dB at 50/60Hz

• NMRR: >60 dB at 50/60Hz

• Power Consumption: 1.6W

• Current Consumption:

  • +5V Modulebus: 75mA

  • +24V Modulebus: 50mA

• Dimensions: 150×100×35mm (varies slightly by source)

• Weight: Approximately 0.2-0.22kg

• Operating Temperature: -20°C to +60°C (some sources indicate -40°C to +85°C)

• Certifications: CE, IEC 61131-2 

Key Features

1. High Precision Measurement:

   • 15-bit resolution for accurate signal acquisition

   • ±0.2% accuracy for reliable process monitoring

   • Cold junction compensation for thermocouple measurements 

2. Flexible Configuration:

   • Each channel independently configurable for thermocouple or mV input

   • Channel 8 can be designated as cold junction (CJ) channel (4-wire Pt100 RTD)

   • Supports wide range of thermocouple types (B, C, D, E, J, K, L, N, R, S, T, U) 

3. Advanced Diagnostics:

   • Input monitoring for broken wire detection

   • LED indicators for channel status

   • Continuous self-calibration using 0V, 50mV and 100Ω references 

4. Robust Design:

   • Galvanic isolation for noise immunity

   • Industrial-grade components for harsh environments

   • Designed for long-term reliability 

5. System Integration:

   • Part of ABB's S800 I/O system

   • Compatible with ABB AC 800M controllers

   • Works with various Module Terminal Units (TU810, TU812, TU814, TU818, TU830, TU833) 

Application Fields

1. Process Industries:

   • Boiler temperature monitoring

   • Chemical reactor safety systems

   • Petrochemical process control 

2. Power Generation:

   • Steam turbine control

   • Power plant instrumentation

   • Generator temperature monitoring 

3. Manufacturing:

   • Industrial furnace control

   • Plastic extrusion temperature monitoring

   • Metal processing applications 

4. HVAC Systems:

   • Large building temperature monitoring

   • Chiller plant control

   • Energy management systems 

5. Water Treatment:

   • Process temperature monitoring

   • Equipment protection systems

   • Environmental monitoring 

Installation and Operation Notes

Wiring Guidelines

• Use shielded twisted-pair cables for analog signals

• Maintain proper separation from power cables (>20cm)

• Implement single-point grounding for shields

• For thermocouple connections, observe proper polarity 

Configuration Options

1. Cold Junction Measurement:

   • Channel 8 can be configured for CJ temperature measurement

   • Temperature can be measured locally at MTU screw terminals or remotely

   • Alternatively, fixed junction temperature can be set as parameter 

2. Input Types:

   • Each channel can be configured for:

     • Thermocouple (select type)

     • Linear mV input (-30mV to +75mV)

     • Grounded or ungrounded connections 

Maintenance

• Regularly check terminal connections

• Monitor module status indicators

• Keep ventilation paths clear

• Verify calibration periodically 

System Integration

The AI835A module is designed to work seamlessly with:

• ABB AC800M controllers

• Various Module Terminal Units (MTUs):

  • TU810/TU814 (compact)

  • TU812 (D-Sub 25-pin)

  • TU818 (2-wire transmitter)

  • TU830/TU833 (extended) 

The structure and details of the product：

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