Emerson PR6423/002-030 Eddy Current Sensor Shaft Vibration Monitoring

Emerson PR6423/002-030 (also known as the EPRO PR6423/002-030) is a high-precision 8mm eddy current proximity sensor engineered for non-contact measurement of shaft vibration, displacement, eccentricity, and speed in critical rotating machinery . As a core component of Emerson's AMS suite and machinery protection systems, this industrial-grade transducer is the preferred choice for power generation, oil and gas, and heavy manufacturing applications worldwide .

What is the Emerson PR6423/002-030?

The Emerson PR6423/002-030 is a non-contact eddy current displacement sensor designed to measure the dynamic and static behavior of rotating shafts . It operates on the eddy current principle, generating a high-frequency electromagnetic field that induces circulating currents in conductive targets. Changes in the gap distance between the sensor tip and the shaft surface alter the field characteristics, producing a proportional voltage output . This enables precise detection of radial and axial movement, vibration signatures, and shaft position with micron-level accuracy .

The sensor is part of the renowned EPRO PR6423 series, specifically engineered to provide reliable performance in harsh industrial environments. It is widely used for monitoring critical machinery components such as shafts, bearing housings, and rotors in steam turbines, gas turbines, hydro turbines, compressors, gearboxes, pumps, and fans .

Key Technical Specifications (Specs)

Understanding the technical parameters of the PR6423/002-030 is essential for proper system integration and application success.

Parameter Specification

Manufacturer Emerson (EPRO)

Model Number PR6423/002-030

Sensor Type 8mm Eddy Current Proximity Probe 

Probe Diameter 8 mm 

Linear Measurement Range 2.0 mm (0.079 inches) 

Scale Factor (Sensitivity) 8.0 V/mm (203 mV/mil) ±5% 

Initial Air Gap 0.5 mm (20 mils) 

Frequency Response DC to 10 kHz (-3dB) 

Operating Temperature (Sensor) -35°C to +180°C (-31°F to +356°F) 

Operating Temperature (Cable) -35°C to +200°C (-31°F to +392°F) 

Protection Rating IP66 / IP67 / IP68 (sealed construction) 

Thread Size M8 x 1.0mm metric thread 

Cable Length 3.0 meters or 5.0 meters (configuration dependent) 

Target Material Ferromagnetic steel (e.g., 42CrMo4, AISI/SAE 4140) 

Minimum Shaft Diameter 25 mm 

Housing Material Stainless steel 

Compliance API 670, ISO 7919, API 612 certified