Product Overview

The Epro PR6423/010-020-CN is an 8 mm Eddy Current Sensor for non-contact measurement of shaft position and mechanical movement in rotating equipment. It operates close to a conductive metal target and detects changes in the distance between the probe tip and the monitored surface without making physical contact.

The sensor is suited to machinery instrumentation where shaft movement needs to be observed continuously. Typical measurement points include turbine shafts, compressor rotors, pump shafts, and bearing assemblies. Depending on the monitoring arrangement, the measured movement can be used for vibration, radial displacement, or axial position monitoring.

The PR6423/010-020-CN can be installed at a fixed location facing the rotating shaft. As the shaft moves relative to the probe, the changing gap modifies the eddy current response. Associated signal-conditioning electronics then convert the probe response into usable monitoring information.

For field maintenance, probe position and mechanical clearance are critical. A replacement sensor should be installed at the same measurement location and checked against the existing monitoring configuration to avoid introducing an incorrect mechanical reference.

Technical Specifications

Product Features

The PR6423/010-020-CN is intended for direct non-contact sensing at the rotating-machine measurement point.

Key characteristics include:

• Epro PR6423 series eddy current sensor
• 8 mm sensor head diameter
• Non-contact measurement principle
• Suitable for conductive rotating targets
• Applicable to shaft position monitoring
• Suitable for vibration and displacement measurement applications
• Compact sensing head for restricted installation areas
• Suitable for continuous rotating machinery monitoring
• Applicable to turbine and compressor instrumentation
• Can be used within machinery protection and condition-monitoring systems
• Suitable for replacement and maintenance of existing Epro sensing installations

Working Principle

The PR6423/010-020-CN detects the relative distance between the stationary probe and a conductive rotating target by means of an eddy current sensing field.

Probe → Electromagnetic Field → Conductive Shaft → Gap Change → Electrical Response → Monitoring Electronics

1. Sensing Field Generation

   The probe generates an alternating electromagnetic field at the sensor head.

2. Interaction with the Shaft

   When the sensor is positioned near a conductive shaft, the electromagnetic field interacts with the target and induces eddy currents in its surface.

3. Gap Detection

   The electrical characteristics of the sensing circuit vary with the distance between the probe and the target.

4. Movement Measurement

   Shaft vibration, radial movement, or axial displacement changes the probe-to-target gap. The corresponding electrical variation represents the detected mechanical movement.

5. Signal Processing

   The probe signal is passed to associated signal-conditioning electronics and then to the machinery monitoring or protection system.

The measurement depends on a stable probe mounting position and a correctly established relationship between the sensor head and the monitored shaft.

Role in a Rotating Machinery Monitoring Architecture

The PR6423/010-020-CN serves as the sensing element at the machine level of an eddy current monitoring chain.

Rotating Shaft → PR6423/010-020-CN → Signal Conditioning → Monitoring / Protection System

Industrial Applications

The sensor is suited to critical machinery where shaft movement must be monitored without introducing physical contact between the probe and rotating component.

Installation and Maintenance

1. Verify the complete PR6423/010-020-CN model before replacement.
2. Confirm that the 8 mm sensor head fits the existing mounting arrangement.
3. Inspect the probe mounting point for contamination, mechanical damage, or loose hardware.
4. Position the sensor correctly relative to the conductive shaft.
5. Establish the required probe-to-target clearance according to the applicable monitoring-system requirements.
6. Secure the probe firmly so machine vibration does not change its mechanical position.
7. Inspect the cable route for mechanical damage or excessive electrical interference.
8. Check the probe connection to the associated signal-conditioning equipment.
9. Verify the sensor signal before normal machine operation.
10. Compare the measurement with the expected shaft condition.
11. Recheck probe position after bearing, shaft, or housing maintenance.
12. Inspect the sensor head and mounting hardware during scheduled maintenance.

For an abnormal reading, check probe position, mechanical gap, shaft condition, cable integrity, and signal-conditioning electronics before replacing the sensor.

Related Components

Recommended Related Models

Key Advantages

• Epro PR6423 series eddy current sensing technology.
• 8 mm sensor head diameter.
• Non-contact measurement of conductive rotating targets.
• Suitable for shaft position, displacement, and vibration monitoring.
• Compact sensor head for confined installation locations.
• Applicable to turbines, compressors, pumps, generators, and other rotating equipment.
• Suitable for continuous machinery-condition monitoring.
• Can be integrated with associated signal-conditioning and machine-protection systems.

Technical FAQs

What is the primary measurement function of the Epro PR6423/010-020-CN?

The PR6423/010-020-CN detects changes in the distance between the stationary probe and a conductive target. In rotating machinery, this principle can be used to monitor shaft position, displacement, and vibration-related movement.

Why is the probe installed without touching the rotating shaft?

The eddy current principle measures the target through an electromagnetic field, so the probe does not need to make physical contact with the shaft. This avoids mechanical contact between the sensing element and the rotating component during continuous operation.

How does probe mounting affect PR6423/010-020-CN measurement accuracy?

The probe establishes the physical reference for the measurement. Movement of the probe itself, incorrect clearance, poor alignment, or changes to the mounting position can be interpreted by the monitoring system as a change in shaft movement.

What should be verified when replacing an existing PR6423/010-020-CN?

The replacement should match the existing model and measurement arrangement. Engineers should verify the sensor head size, mounting position, probe-to-shaft clearance, cable connection, associated signal-conditioning equipment, and monitoring-system configuration before commissioning.