The ABB AI835A (3BSE051306R1) is a high-performance analog input module belonging to the S800 I/O series, designed for integration with ABB Ability System 800xA control systems. This module features 8 differential input channels capable of processing both millivolt signals and a wide range of thermocouple types, providing reliable temperature and low-voltage monitoring for critical industrial processes.
Technical Description
The AI835A provides versatile signal conditioning with configurable measurement ranges for each channel. It supports linear inputs from -30 mV to +75 mV, as well as a comprehensive list of thermocouple standards including types B, C, D, E, J, K, L, N, R, S, T, and U. For temperature compensation, Channel 8 can be configured as a Cold Junction (CJ) channel, allowing for ambient temperature measurement via a Pt100 RTD sensor. This sensor can be mounted directly on the module's Module Termination Unit (MTU) or located at a remote connection point. If CJ compensation is not required, Channel 8 may be utilized as a standard differential input.
Features
- 8 differential input channels for thermocouple and mV signals.
- High-precision 15-bit A/D resolution for accurate process monitoring.
- Comprehensive thermocouple support: B, C, D, E, J, K, L, N, R, S, T, and U.
- Integrated wire-break and open-circuit detection for enhanced diagnostic capability.
- Groupwise isolation from ground to ensure signal integrity.
- Configurable Cold Junction compensation via Channel 8.
Technical Specifications
| Model | AI835A (3BSE051306R1) |
| Channels | 8 Differential |
| Resolution | 15 bits |
| Input Impedance | > 1 MΩ |
| Max Cable Length | 600 meters |
| CMRR (50/60Hz) | 120 dB |
| NMRR (50/60Hz) | > 60 dB |
| Power Dissipation | 1.6 W |
| Isolation | Groupwise isolated |
| Rated Insulation | 50 V |
Installation Guidelines
- Ensure all power is disconnected from the I/O rack before inserting or removing the AI835A module.
- Use shielded twisted-pair cabling for all field inputs to minimize EMI interference; ensure shields are properly grounded at the designated termination points.
- Maintain proper ventilation within the cabinet to stay within operating temperature limits.
- Verify that the MTU (Module Termination Unit) is correctly installed and wired before seating the module.
- Handle with care to prevent electrostatic discharge (ESD) damage during installation.
Applications
- Power Generation: Boiler temperature monitoring, exhaust gas analysis, and turbine diagnostics.
- Chemical & Petrochemical: Reactor temperature control and fluid line monitoring.
- Oil & Gas: Remote extraction site data acquisition and refinery process monitoring.
- Water & Wastewater: Climate tracking and liquid process management.
- Metallurgy: Furnace, casting, and curing temperature regulation.
FAQ
What is the primary function of the AI835A module?
The AI835A is an analog input module designed to interface thermocouple and millivolt sensors with the ABB S800 I/O system, primarily for accurate temperature measurement in industrial automation environments.
Can Channel 8 be used for standard inputs?
Yes, if Cold Junction (CJ) compensation is not required, Channel 8 can be configured to function as a standard differential input channel just like channels 1 through 7.
Is this module compatible with HART communication?
No, the AI835A does not support HART communication or Sequence of Events (SOE) time-tagging.
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Guide
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