The ABB 3BSE008520R1 (Type AI835) is an 8-channel analog input module specifically designed for temperature measurement using thermocouples (TC) and low-voltage millivolt (mV) signals. As a key component of the S800 I/O system, it provides high-resolution digitization of thermal data, supporting a wide range of industry-standard thermocouple types. With 50V rated isolation and specialized Cold Junction Compensation (CJC) capabilities, the AI835 ensures accurate and stable temperature monitoring for boilers, furnaces, and other thermal process equipment.
Technical Specifications
Product ID:3BSE008520R1
Type Designation:AI835
Input Channels:8 isolated channels
Signal Types:Thermocouple (B, C, E, J, K, L, N, R, S, T, U) and mV signals
Resolution:14-bit (plus sign)
Isolation Voltage:50 V (rated)
Compatible MTUs:TU810, TU812, TU814, TU830, TU833
CJC Support:Requires external or internal Cold Junction Compensation (typically via TU835 or TY820)
Dimensions (W x H x D):75 mm x 150 mm x 150 mm
Net Weight:0.2 kg
HS Code:853890 (Parts for electrical control or distribution)
Key Features
Broad Thermocouple Support:Natively handles nearly all common thermocouple types, including noble metal (R, S, B) and base metal (K, J, T, E, N) sensors.
Millivolt Measurement:Can be configured to measure raw low-voltage signals (-10 mV to +100 mV), offering flexibility for non-temperature related sensor inputs.
Cold Junction Compensation:Works in tandem with specialized accessories like the TY820 sensor to provide precise cold junction compensation, critical for maintaining measurement accuracy.
High-Density Monitoring:8 channels per module allow for cost-effective temperature profiling of large industrial assets like turbines or multi-zone ovens.
Integrated Diagnostics:Continuously monitors for sensor "burnout" (open circuits) and internal module hardware failures, triggering immediate system alarms to prevent process deviations.
