ABB AI843 Thermocouple Input Module | 8-Channel S800 I/O

ABB AI843 Thermocouple/mV Input Module

The ABB AI843 module provides eight differential input channels for thermocouple and millivolt measurements. It features integrated cold junction compensation and supports multiple thermocouple types. This precision module delivers accurate temperature measurements for industrial process applications.

Key Features

• Eight differential input channels for thermocouple/mV signals
• 16-bit resolution for high-precision measurements
• Integrated cold junction compensation with Pt100 RTD
• Supports 11 thermocouple types: B, C, E, J, K, L, N, R, S, T, U
• Wire-break detection and open-circuit monitoring
• Single or redundant operation capability

Technical Specifications

• Brand: ABB
• Model: AI843
• Article Number: 3BSE028925R1
• Number of Channels: 8 differential inputs
• Measurement Ranges: -30 mV to +75 mV linear
• Resolution: 16 bits
• Input Impedance: > 1 MΩ
• Accuracy: Max. 0.1% error
• Cold Junction: Separate Pt100 RTD channel
• Max Cable Length: 600 meters or 500 Ω

Thermocouple Support

• Types B, C, E, J, K, L, N, R, S, T, U
• Configurable per individual channel
• Linear mV range: -30 to +75 mV
• Cold junction temperature range: -40°C to 100°C

Cold Junction Compensation

• Dedicated Pt100 RTD channel
• 4-wire RTD measurement for accuracy
• Local or remote junction temperature measurement
• User-configurable fixed junction temperature option
• Automatic cold junction error detection

Performance Specifications

• CMRR: 100 dB at 50/60 Hz
• NMRR: >40 dB
• Input Filter: 1.1 kHz bandwidth
• Temperature Drift: 10 ppm/°C typical, 25 ppm/°C max
• Update Cycle: 320-960 ms (50Hz), 267-800 ms (60Hz)

Power Requirements

• +5V Modulebus: 60 mA
• +24V Modulebus: 50 mA
• +24V External: Not required
• Power Dissipation: 1.5W

Diagnostics & Monitoring

• Front panel status LEDs (Fault, Run, Warning)
• Wire-break detection on all channels
• Cold junction channel error monitoring
• Reference channel limit supervision
• Power supply low detection

Environmental Specifications

• Operating Temperature: 0 to +55°C
• Storage Temperature: -40 to +70°C
• Protection Class: IP20
• Relative Humidity: 5 to 95% non-condensing
• Hazardous Location certifications available

Physical Dimensions

• Width: 45 mm (1.77”)
• Depth: 102 mm (4.01”)
• Height: 119 mm (4.7”)
• Weight: 0.157 kg (0.35 lbs.)

Compatibility

• Designed for S800 I/O platform
• Works with TU818, TU830, TU833 series
• Compatible with TU842, TU843 models
• Keying code: BA

Shipping Information

• Secure industrial packaging
• Worldwide shipping via FedEx, UPS, DHL
• Complete documentation included

Frequently Asked Questions

What thermocouple types does the AI843 support?

The module supports 11 thermocouple types: B, C, E, J, K, L, N, R, S, T, and U.

How does cold junction compensation work?

A separate 4-wire Pt100 RTD channel provides accurate cold junction temperature measurement.

What is the resolution of the AI843 module?

It features 16-bit resolution for high-precision temperature measurements.

Does the module detect wiring problems?

Yes, it includes wire-break detection and open-circuit monitoring on all channels.

Can the module operate in redundant configuration?

Yes, the ABB AI843 supports both single and redundant operation modes.

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