ABB AI820 Input Module

## Technical Specifications

The AI820 is a differential analog input module designed for voltage and current signals.

## Product Advantages

• High Precision: With 14-bit resolution, it ensures accurate data acquisition for sensitive processes.

• Galvanic Isolation: Excellent noise immunity and protection against ground loops, ensuring signal integrity in "dirty" electrical environments.

• Hot Swap Capability: Supports S800 Hot Swap functionality, allowing you to replace modules without powering down the entire station.

• Robust Diagnostic Features: Includes internal self-tests and reporting for "Module OK" status and "Channel Faults."

## Usage Precautions

• Wiring for Current: Unlike some modules with internal shunts, the AI820 typically requires an external precision resistor (usually 250 $\Omega$) to convert current signals (4-20 mA) into voltage for the module to read.

• Termination Units: It must be used with a compatible MTU (Module Termination Unit), such as the TU810, TU812, or TU830.

• Grounding: Ensure that cable shields are properly grounded at one end to prevent electromagnetic interference (EMI) from skewing readings.

• Environmental Limits: Avoid installing in areas exceeding the rated temperature range (typically 0 to +55°C) without proper forced cooling.

## Product Applications

The AI820 is versatile and used across various heavy industries:

• Oil & Gas: Monitoring pressure transmitters and flow meters.

• Power Plants: Temperature monitoring and turbine control feedback.

• Chemical Processing: Interfacing with pH sensors and level transmitters.

• Water Treatment: Real-time monitoring of tank levels and pump pressures.

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