The Emerson A6210 (9199-00003) Thrust Differential Expansion Module is a high-accuracy monitoring and protection device designed for axial position and thermal growth measurement in large rotating machinery such as turbines and compressors.
1. Key Functions
Thrust Position Monitoring – Measures rotor axial displacement (thrust bearing wear) using eddy current probes (typically ±2mm range).
Differential Expansion Tracking – Detects case-to-rotor thermal growth differences (critical during startup/shutdown).
Alarm & Trip Logic – Provides 4-20mA outputs and relay contacts for machine protection (API 670 compliant).
Dynamic Compensation – Adjusts for thermal drift to maintain accuracy over temperature fluctuations.
2. Technical Specifications
Inputs: 2/4 channels (accepts Bently Nevada 3300/7200 series probes).
Measurement Range:
Thrust: ±1mm to ±4mm (configurable).
Differential Expansion: ±10mm typical.
Accuracy: ±1% FS (Full Scale) with temperature compensation.
Outputs:
4-20mA (isolated) for DCS/PLC integration.
Relay contacts (trip/alarm).
Communications: Modbus RTU/TCP (optional).
3. Applications
Power Plants: Steam/gas turbine thrust bearing protection.
Oil & Gas: Compressor surge prevention (API 617/614 standards).
Industrial: Large pump/motor axial position monitoring.
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