The EPRO PR6423 is a robust eddy current probe used for high-precision, non-contact measurement of shaft movement. By generating a high-frequency electromagnetic field, the probe tip senses the distance to a metallic target. This technology is unaffected by the presence of oil or water in the gap, making it the superior choice for monitoring lubricated bearings in heavy-duty machinery.
The PR6423 is primarily utilized for monitoring radial shaft vibration, axial shaft displacement, and eccentricity. In steam turbines, for example, maintaining the correct axial position is vital to prevent catastrophic contact between the rotor and stator. The PR6423 provides the real-time data necessary for the Machine Protection System (MPS) to execute an emergency trip if limits are exceeded.

The sensor features a high-grade stainless steel body and a ceramic or PEEK tip, capable of withstanding the aggressive environments found inside bearing housings. The cable is typically integrated and features an oil-tight seal at the probe exit. Various thread sizes and tip diameters are available within the PR6423 family to suit different mounting requirements and measurement ranges.
To ensure signal purity, the PR6423 utilizes a triaxial or shielded coaxial cable design. This minimizes the influence of parasitic capacitance and protects against external electrical noise. When paired with a compatible EPRO converter, the PR6423 delivers a high-resolution signal with negligible drift, even over long periods of continuous operation.
From hydropower plants to LNG carriers, the PR6423 is trusted by OEMs and end-users alike. Its compliance with API 670 standards makes it a globally recognized component for machinery protection. Its reliability ensures that plant operators have accurate data to perform predictive maintenance, extending the life of critical assets.



