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ABB AI835A

Product Features

1. Eight differential input channels: Acquires thermocouple and millivolt signals for industrial temperature measurement.

2. Wide thermocouple compatibility: Supports types B, C, D, E, J, K, L, N, R, S, T and U.

3. Cold-junction compensation: Channel 8 can be configured for cold-junction temperature measurement using a four-wire Pt100 RTD, supporting compensation for channels 1–7.

4. 15-bit A/D resolution: Converts analog input signals into digital values for process monitoring and control.

5. Open-circuit detection: Monitors inputs for wire-break conditions to help identify sensor or wiring faults.

6. High noise immunity: Provides a common-mode rejection ratio of 120 dB at 50/60 Hz and a normal-mode rejection ratio greater than 60 dB.

Structural Composition

The AI835A consists of analog input circuits, signal-conditioning circuitry, analog-to-digital conversion circuitry, cold-junction compensation functionality, diagnostic circuits and a ModuleBus interface.

The module connects to field thermocouples through a compatible ABB S800 I/O Module Termination Unit (MTU). Compatible MTUs include TU810V1, TU812V1, TU814V1, TU830V1 and TU833.

Application Fields

• Power generation: Boiler, turbine auxiliary and process temperature monitoring.

• Oil and gas: Temperature measurement in pipelines and process equipment.

• Chemical processing: Reactor, tank and production-line temperature monitoring.

• Metallurgy: Furnace and thermal-process measurement where supported thermocouple types are used.

• Manufacturing: Industrial ovens, heating equipment and temperature-controlled production systems.

• Process automation: Integration of thermocouple measurements into ABB control and monitoring systems.

Maintenance Considerations

• Verify the model and order number: AI835A / 3BSE051306R1.

• Confirm the thermocouple type and channel configuration.

• Check the cold-junction compensation arrangement, particularly when channel 8 is assigned to this function.

• Inspect sensor polarity, wiring continuity and terminal connections.

• Review module diagnostic LEDs and controller alarms.

• Confirm MTU compatibility and validate channel readings after replacement.

Overall Evaluation

The ABB AI835A 3BSE051306R1 is an eight-channel thermocouple and millivolt input module for ABB S800 I/O systems. Its broad thermocouple support, cold-junction compensation options, 15-bit conversion resolution and wire-break diagnostics make it suitable for industrial temperature acquisition and process monitoring.