ABB AI835 3BSE008520R1 S800 I/O Thermocouple Analog Input Unit

Description

The ABB AI835 is a high-performance analog input module designed specifically for direct temperature measurement using thermocouples within the S800 I/O system. This 8-channel unit provides precise conversion of low-voltage millivolt signals from various thermocouple types into digital values for the AC 800M controller. It features sophisticated cold-junction compensation and electrical isolation, making it an essential component for high-temperature monitoring in industrial furnaces, boilers, and turbine applications where thermal accuracy is paramount.

Specifications

• Manufacturer: ABB

• Country of Origin: Switzerland

• Model Number: AI835

• Order Number: 3BSE008520R1

• Product Type: Thermocouple Analog Input Module

• Input Channels: 8 isolated channels

• Thermocouple Types: B, C, E, J, K, N, R, S, T

• Linear Voltage Input: -30 to +75 mV

• Resolution: 15-bit plus sign

• Weight: 0.2 kg

• Power Supply: 24V DC nominal

Features

• Cold Junction Compensation: Supports both internal and external CJC to ensure measurement accuracy regardless of terminal temperature fluctuations.

• Superior Signal Integrity: Advanced interference rejection filters protect sensitive millivolt inputs from high-frequency industrial noise.

• Safety Diagnostics: Continuous monitoring for open-circuit detection (sensor break) with automatic reporting to the control system.

• Galvanic Isolation: Provides individual isolation between field inputs and system logic to prevent ground loop interference and equipment damage.

• Software Configuration: Every channel can be independently programmed for specific thermocouple types or millivolt ranges through System 800xA.

• Compact Maintenance: Designed for hot-swap installation on standard S800 Module Termination Units, minimizing downtime during hardware service.