TheAI895(3BSC690086R1) is an advanced 8-channel analog input module designed for the ABB S800 I/O platform. It is specifically engineered to provide integrated Intrinsic Safety (IS) for 4–20 mA loop devices located in hazardous areas. This module eliminates the need for external safety barriers, allowing for a more compact and cost-effective cabinet design. Each channel is capable of providing power and monitoring for 2-wire process transmitters while maintaining full HART communication transparency for advanced device management.
Technical Specifications
Model/Part Number:AI895(3BSC690086R1)
Input Type:Unipolar Single-Ended
Number of Channels:8
Signal Range:4 to 20 mA
HART Support:Yes, integrated pass-through on all channels
Safety Rating:Intrinsically Safe (Ex) protection on each channel
Loop Voltage:Minimum 15 V at 20 mA for field devices
Voltage Drop:Typically 3 V (including PTC)
Current Limit:23 mA in overload conditions
Isolation:1 group of 8 channels isolated from ground
MTU Compatibility:TU890 (Ex applications) and TU891 (Non-Ex)
Key Engineering Features
TheAI895(3BSC690086R1) offers specialized hardware features to support complex field instrumentation:
Flexible Wiring Support:While optimized for 2-wire transmitters, the module can be configured to interface with 4-wire (externally powered) transmitters without sacrificing its native HART capabilities.
Non Energy-Storing Inputs:Designed with non energy-storing analog inputs, making it safe for connection to externally powered sources in sensitive environments.
HART Transparency:Facilitates seamless digital communication for asset optimization, allowing engineers to perform remote calibration and health monitoring of field instruments.
Compact Integration:The use of the TU890/TU891 Compact MTU enables a direct 2-wire connection to process devices, significantly reducing the requirement for additional terminal blocks and complex wiring.
