Emerson A6220 dual-channel shaft eccentricity monitor module for AMS 6500 Machinery Health Monitor, API 670 compliant turbomachinery protection spare for steam turbines and compressors.

Product Overview

• Part No: A6220
• Brand: EMERSON

• Category: Dual-Channel Shaft Eccentricity Monitor Module A6220 is a single-slot monitor module developed for Emerson AMS 6500 Machinery Health Monitor system, fully compliant with API 670 machinery protection standards. It accepts signals from non-contact eddy current proximity probes to continuously measure shaft eccentricity, which reflects shaft bowing and bending conditions, especially critical for large sleeve-bearing rotating equipment operating below 600 rpm such as steam turbines, gas turbines and centrifugal compressors. The module supports independent configuration of two measurement channels. It compares real-time eccentricity data against user-defined alert and danger setpoints to trigger alarm outputs and protection interlocks. Buffered raw sensor signals, 4–20mA analog outputs and 0–10VDC outputs are available for data transmission to DCS systems. Front panel LED indicators display channel health and alarm status for on-site inspection. It supports hot-swap replacement and serves as essential spare for power plant and petrochemical turbomachinery condition monitoring systems.

• 
  

Core Features

• Two independent input channels for proximity transducer signals
• Specialized for shaft eccentricity measurement to detect bent rotor conditions
• Supports peak-to-peak, minimum/maximum and continuous gap measurement modes
• Configurable alert and danger alarm thresholds per channel
• Buffered raw sensor signal outputs for offline vibration analysis
• Dual output options: 0/4–20mA current and 0–10VDC voltage signals
• Front panel LED indicators for channel normal status, alert and danger alarms
• Hot-swap capable for online maintenance without system shutdown
• RS-232 interface for module configuration and status retrieval

• Robust hardware design suitable for continuous operation in industrial environments

• 
  

Technical Specifications

• Input Type: Non-contact eddy current proximity probe signal
• Channel Count: 2 independent channels
• Analog Output: 0/4–20mA DC, 0–10VDC
• Accuracy: ±1% of full scale
• Communication: RS-232 for parameter configuration
• Form Factor: Single slot for AMS 6500 rack
• Operating Temperature: -20°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C

• Protection Class: IP20 when installed inside control cabinet

• 
  

Compatibility & Application

• Compatible with Emerson AMS 6500 Machinery Health Monitor rack system
• Matches 6422–6425 series eddy current proximity sensors
• Widely deployed in thermal power plants, combined-cycle power stations, oil & gas and petrochemical industries
• Applied for pre-start rotor bow monitoring and protection of steam turbines, gas turbines and large compressors