Emerson PR6424/002-131 16mm Eddy-Current Contactless Sensor

Emerson PR6424/002-131 is a high-performance 16mm eddy-current contactless sensor designed for continuous monitoring of industrial rotating machinery. Part of Emerson"s advanced sensor portfolio, this probe utilizes eddy current technology to provide precise, non-contact measurements of shaft vibration and position in critical equipment such as steam turbines, compressors, pumps, and generators.

Key Technical Specifications

The PR6424/002-131 delivers exceptional measurement capabilities tailored for large shaft applications (≥80mm shaft diameter) :

Sensitivity/Linearity: 4 V/mm (101.6 mV/mil) ±1.5% maximum, ensuring accurate and repeatable measurements 

Measurement Range: ±2.0 mm (0.079") static range; 0 to 1,000µm (0 to 0.039") dynamic range 

Center Air Gap: Approximately 2.7 mm (0.11") nominal for optimal performance 

Operating Temperature: Wide range from -35°C to 180°C (-31°F to 356°F), suitable for extreme industrial environments 

Robust Construction: Withstands 5g vibration @ 60 Hz, weight 200 grams (sensor with 1m cable) 

How Eddy Current Technology Works

The Emerson PR6424/002-131 operates on the eddy current principle, where a high-frequency alternating current flows through a coil in the sensor tip . This generates an alternating magnetic field. When a conductive target (typically the rotating shaft) approaches, eddy currents are induced in the target material, creating a secondary magnetic field that opposes the original field . This interaction changes the coil's impedance proportionally to the distance between sensor and target. The signal conditioner converts this impedance change into a voltage output directly proportional to displacement.