Product Overview

The Epro PR6423/011-110 8mm Eddy Current Sensor is a non-contact eddy current probe used to monitor the movement and position of conductive machine components. It belongs to the PR6423 Series and is commonly used as the sensing element in rotating machinery monitoring systems.

The sensor detects changes in the distance between its sensing tip and a conductive target such as a rotating shaft. Because the measurement does not require physical contact, the probe can monitor shaft movement while the machine is operating.

The PR6423/011-110 is typically connected to a compatible Epro signal converter or conditioning unit. The converter processes the probe response and supplies the resulting measurement to a machinery monitoring or protection system.

The probe can be applied to measurements involving shaft radial displacement, axial movement, eccentricity, and vibration-related mechanical conditions. For replacement work, the sensor should be matched with the existing converter, cable arrangement, mounting method, and monitoring input.

Technical Specifications

Product Features

• 8 mm eddy current sensing technology for non-contact measurement
• Detects movement of conductive rotating machine targets
• Suitable for shaft displacement and position monitoring
• Applicable to radial and axial shaft movement measurement
• Can support eccentricity and vibration-related monitoring
• Works with compatible Epro signal-conditioning electronics
• Suitable for turbine and compressor monitoring systems
• Applicable to machinery condition monitoring and protection
• Suitable for replacement applications within compatible PR6423 installations

Working Principle

The PR6423/011-110 uses an electromagnetic field to detect changes in the distance between the probe tip and a conductive machine target.

Conductive Machine Target → PR6423/011-110 → Signal Conditioning Electronics → Machinery Monitoring System

When the rotating shaft moves relative to the probe, the electromagnetic response at the sensing tip changes. This variation corresponds to the changing distance between the probe and target. A compatible signal-conditioning unit converts the sensor response into a measurement signal for the downstream monitoring system.

Typical measurements include:

• Shaft radial displacement
• Shaft axial position
• Rotor eccentricity
• Shaft vibration
• Rotational movement
• Machinery protection parameters

The non-contact operating method allows the probe to remain stationary while measuring a continuously rotating shaft.

Role in a Rotating Machinery Monitoring Architecture

The sensor serves as the front-end measurement element in a shaft displacement or vibration monitoring channel.

Rotating Shaft → PR6423/011-110 → Signal Conditioner → Machinery Monitor → Alarm / Protection

Industrial Applications

Installation and Maintenance

1. Confirm that the PR6423/011-110 is the correct sensor for the existing monitoring system.
2. Verify compatibility with the associated signal-conditioning electronics before installation.
3. Check the conductive target surface and confirm that it is suitable for eddy-current measurement.
4. Install the probe securely at the specified measurement position.
5. Establish the required probe-to-target gap according to the applicable measurement chain.
6. Check the probe alignment relative to the monitored shaft.
7. Inspect the mounting arrangement for looseness or mechanical movement.
8. Connect the sensor using the appropriate cable and connector arrangement.
9. Keep the sensor wiring away from strong sources of electrical interference where practical.
10. Check the signal-conditioning electronics and monitoring input before commissioning.
11. Verify the measurement signal during machine startup and compare it with expected shaft behavior.
12. Inspect the probe tip, cable, connectors, and mounting hardware during scheduled maintenance.
13. If the signal becomes unstable, check the probe gap, alignment, cable, converter, target condition, and monitor as a complete measurement chain.
14. Replace the probe only after installation and signal-path checks have ruled out external causes.

A missing or abnormal measurement can originate from the sensor, cable, converter, mounting arrangement, or monitoring system. Testing each stage of the signal path helps prevent unnecessary component replacement.

Related Components

Recommended Related Models

Key Advantages

• Non-contact measurement of conductive rotating machine targets
• 8 mm sensing format for rotating machinery applications
• Suitable for shaft displacement and position monitoring
• Supports radial and axial movement measurement
• Applicable to eccentricity and vibration-related monitoring
• Works with compatible Epro signal-conditioning electronics
• Suitable for turbines, compressors, pumps, generators, and motors
• Practical for maintenance and replacement of compatible PR6423 installations

Technical FAQs

What is the PR6423/011-110 mainly used to monitor?

It is used to detect changes in the position or movement of a conductive machine target. In rotating machinery systems, this can support shaft displacement, axial position, eccentricity, and vibration-related measurements.

Does the PR6423/011-110 contact the rotating shaft during operation?

No. It uses eddy-current sensing to detect the target without physical contact. The probe remains fixed while the shaft rotates within the measurement range.

Which component processes the signal from the PR6423/011-110?

A compatible Epro signal-conditioning converter is normally used downstream of the probe. The converter processes the sensor response before the measurement is sent to the machinery monitoring or protection system.

What should be checked if the PR6423/011-110 produces an unstable signal?

Check the probe-to-target gap, alignment, mechanical mounting, cable and connectors, signal converter, target surface, and monitoring input. Checking the entire measurement chain is more effective than assuming the sensor itself is defective.