EPRO PR6423/10R-030 Eddy Current Sensor for Shaft Vibration and Position Monitoring

The EPRO PR6423/10R-030 is an 8 mm eddy current sensor designed for non-contact shaft vibration and position measurement in industrial rotating machinery. It is used in monitoring systems for steam turbines, gas turbines, compressors, pumps and generators, where changes in shaft movement can provide useful information about machine condition.

The sensor works by measuring the gap between its tip and a metal shaft. When the shaft moves, the gap changes, and the sensor system converts this change into an electrical signal. A compatible signal converter then processes the signal for use by the machine monitoring system. This allows shaft movement to be measured without physical contact with the rotating part.

The PR6423 series has a nominal sensitivity of 8 V/mm, a 2 mm linear measurement range, and a frequency response of DC to 20 kHz (-3 dB). These features support both shaft position measurement and dynamic vibration monitoring. The series is also designed for demanding industrial conditions, with a stainless-steel housing and an IP66 protection rating.

The 10R version uses a reverse-mount design, which can be useful when the probe needs to be installed from the rear of a mounting point. This arrangement gives engineers another option when the space around a bearing housing is limited or access from the front is difficult.

The 8 mm sensing tip is designed for shaft measurement in industrial rotating machinery. Its nominal sensitivity of 8 V/mm defines how the output changes as the gap between the probe and the target changes. This helps engineers set the measurement scale and interpret displacement data correctly.

The published PR6423 series specification gives a linear measurement range of 2 mm and an initial air gap of 0.5 mm. Correct gap setting is important because operating outside the linear range can lead to inaccurate readings or loss of useful measurement data.

The PR6423/10R-030 uses a reverse-mount arrangement. This can help when the mounting location does not allow convenient front access or when the probe needs to be fitted through a specific opening in the bearing housing.

Before installation, engineers should confirm the mounting thread, available space, probe position and cable route. The reverse-mount structure should match the actual installation drawing rather than being selected only because the probe diameter is the same as the original part.

1. Set the probe gap carefully.
   The published PR6423 series data gives an initial air gap of 0.5 mm and a linear measurement range of 2 mm. The correct installation gap should be set according to the manufacturer's instructions and the connected converter. Do not set the gap by eye alone when a defined voltage or calibration method is available.
2. Check the shaft material and surface.
   The standard calibration target specified for the PR6423 series is ferromagnetic steel, such as 42CrMo4 / AISI 4140. Different target materials or surface conditions may change the sensor response. If the actual shaft material differs from the standard target, confirm compatibility before using the readings for protection or maintenance decisions.
3. Match the probe with the correct converter.
   The PR6423 is part of a measurement system and must be connected to a compatible signal converter. When replacing a probe, check the full model number, mounting type, cable configuration, connector and converter model. A probe that fits mechanically may still be unsuitable if its electrical configuration does not match the installed system.

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• Rotating machinery online protection systems
• Vibration & shaft-position monitoring
• Steam turbine and compressor safety supervision
• Large fan, generator and high-speed pump condition monitoring
• Oil & gas facilities
• Chemical processing plants
• Power generation facilities
• Metal processing & coal-chemical plants

In a typical compressor maintenance task, a shaft vibration channel may need a replacement probe after a fault is found during inspection. The maintenance team checks the existing probe's mounting arrangement, cable connection, converter model and initial gap before choosing a replacement.

Where the installation requires the reverse-mount PR6423/10R-030, matching the complete configuration helps restore the original measurement setup. After installation, the team verifies the probe gap and signal output before returning the monitoring channel to service.

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• Professional installation required for optimal performance and safety
• Ensure proper mounting and adequate ventilation
• Comply with all applicable electrical safety standards