Product Overview

The Epro PR6423/010-110 is an 8 mm eddy current sensor used for non-contact measurement of shaft displacement and movement in rotating machinery. It serves as the field sensing element in a proximity measurement channel, detecting changes in the distance between the sensor head and a conductive machine target.

The sensor is installed close to the monitored shaft, commonly at a bearing or other defined measurement position. As the shaft moves during operation, the gap between the sensing head and the target surface changes. The eddy current sensing circuit responds to this variation and generates the corresponding measurement signal.

This type of measurement is useful on turbines, compressors, pumps, generators, motors, and other rotating equipment where shaft movement must be monitored continuously. Since the sensing principle does not require physical contact with the rotating component, the sensor can monitor shaft behavior while the machine remains in operation.

The PR6423/010-110 is normally connected to compatible signal-conditioning or monitoring electronics. The complete measurement channel can then be used for shaft vibration, relative displacement, and position monitoring within a machinery condition monitoring or protection system.

Technical Specifications

Product Features

• PR6423 Series eddy current sensor for rotating machinery measurement.
• 8 mm sensor head for shaft monitoring applications.
• Non-contact detection of relative shaft movement.
• Suitable for shaft displacement and vibration measurement.
• Operates as the field sensing element of a complete proximity channel.
• Compatible with associated signal-conditioning and monitoring electronics.
• Suitable for continuous monitoring of critical rotating equipment.

Working Principle

The PR6423/010-110 uses an electromagnetic sensing field to detect changes in the distance between the sensor head and a conductive target. Eddy currents are induced in the target surface, and the electrical response varies as the target moves closer to or farther from the sensor.

When installed near a rotating shaft, radial vibration or axial movement changes the probe-to-target gap. Associated electronics process the sensing response and convert the change into usable displacement information for the machinery monitoring system.

Rotating Shaft → PR6423/010-110 Sensor → Signal Conditioning Electronics → Machinery Monitoring System → Alarm / Protection

The resulting measurement can be used for:

• Radial shaft displacement
• Relative shaft vibration
• Shaft position monitoring
• Mechanical movement detection
• Continuous rotating machinery condition monitoring

The sensor mounting must remain stable because movement of the sensor itself can affect the measured gap.

Role in a Rotating Machinery Control Architecture

The PR6423/010-110 provides the field-level measurement at the rotating machine. It detects physical movement of the shaft and passes the resulting sensing signal to the associated interface electronics for processing.

Machine Shaft → PR6423/010-110 → Signal Conditioning → Monitoring Module → DCS / Protection System

This architecture allows the sensor to be installed directly at the machinery measurement point while signal processing and monitoring functions remain in the instrumentation or control cabinet.

Industrial Applications

Installation and Maintenance

1. Mount the sensor securely at the designated measurement point.
2. Position the sensing head toward the appropriate conductive target surface.
3. Verify the sensor-to-target gap during installation.
4. Ensure the mounting structure remains mechanically stable.
5. Prevent unwanted movement of the sensor during machine operation.
6. Route the sensor cable away from excessive vibration and mechanical hazards.
7. Avoid excessive bending or stress at the cable connection.
8. Verify the connection to the associated signal-conditioning electronics.
9. Check the complete measurement channel before machine startup.
10. Confirm stable signal behavior during initial operation.
11. Compare measured shaft movement with normal equipment operating conditions.
12. Inspect the sensor, mounting, and cabling during scheduled maintenance.

When an abnormal measurement occurs, check the mechanical installation and complete signal path before replacing the sensor.

Related Components

Recommended Related Models

Key Advantages

• Non-contact measurement of rotating shaft movement.
• 8 mm sensor head for compact measurement locations.
• Suitable for shaft displacement and vibration monitoring.
• Supports continuous rotating machinery measurement.
• Integrates with compatible signal-conditioning electronics.
• Suitable for turbine, compressor, pump, generator, and motor applications.
• Can be incorporated into machinery monitoring and protection systems.

Technical FAQs

What is the PR6423/010-110 primarily used for?

It is used to detect changes in the distance between the sensor and a conductive rotating target, allowing relative shaft displacement and vibration-related movement to be monitored.

What makes eddy current sensing suitable for rotating shafts?

The sensing method measures the target without requiring physical contact. This allows the sensor to remain stationary while monitoring the movement of a rotating shaft.

Where is the PR6423/010-110 normally installed?

It is installed at a defined measurement location close to the rotating shaft, such as a bearing or another suitable point for monitoring relative shaft movement.

How should an unstable measurement be investigated?

Check the sensor mounting, probe-to-target gap, cable connections, signal-conditioning electronics, and downstream monitoring channel. Mechanical movement of the sensor mounting should also be checked because it can influence the measured displacement.