Product Overview

The Epro PR6424/001-021 16mm Eddy Current Sensor is a non-contact displacement sensor used for monitoring the position and movement of conductive machine components. It is suited to rotating machinery where direct contact with the moving shaft is undesirable, particularly in continuous-duty monitoring systems.

In a typical machinery monitoring installation, the sensor is mounted with a defined measurement gap to a conductive target such as a rotating shaft. Changes in the target position alter the eddy-current response at the sensor tip, allowing the connected signal-conditioning equipment to produce a proportional measurement signal.

The PR6424/001-021 can be used as part of a machinery protection chain for applications involving shaft displacement, axial movement, radial position, or other mechanical conditions that need continuous observation. It is particularly relevant to turbines, compressors, pumps, generators, and other rotating equipment.

Its practical value comes from the combination of non-contact measurement and continuous monitoring. The sensor itself forms the field measurement point, while the associated signal-conditioning and monitoring equipment handles signal conversion, analysis, alarm handling, and protection functions.

Technical Specifications

Product Features

• Non-contact measurement for conductive targets and rotating machine components.
• Suitable for continuous observation of shaft position and mechanical displacement.
• 16 mm sensor head configuration for machinery monitoring installations.
• Works with associated signal-conditioning equipment to convert the sensor response into a usable monitoring signal.
• Applicable to rotating equipment where shaft movement must be monitored without physical contact.
• Suitable for machinery protection systems that require continuous field measurement.
• Can be applied to turbines, compressors, pumps, generators, and other rotating machinery.

Working Principle

The PR6424/001-021 operates according to the eddy-current measurement principle. When the sensor is positioned near a conductive machine target, an electromagnetic field is established at the sensing end. Movement of the target changes the electrical characteristics of this field.

As a shaft or other conductive target moves relative to the sensor, the resulting change is detected by the sensing circuit. The associated signal-conditioning device then converts the sensor response into a measurement signal that can be processed by the machinery monitoring system.

A typical measurement path is:

Rotating Shaft / Conductive Target → PR6424/001-021 Sensor → Signal Converter → Machinery Monitoring System → Alarm / Protection / Control

This arrangement allows the field sensor to continuously track mechanical movement while keeping the sensing element physically separated from the rotating component.

Role in a Machinery Protection and Monitoring Architecture

The PR6424/001-021 normally functions as the field sensing element within a larger rotating machinery monitoring architecture. The sensor provides the initial measurement, while downstream equipment performs signal conditioning, evaluation, alarming, and protection logic.

Machine Shaft → Eddy Current Sensor → Signal Conditioning → Monitoring / Protection → Control System

This architecture separates the physical measurement point from the monitoring and control functions, making the sensor suitable for integration into continuous rotating-equipment protection systems.

Industrial Applications

Installation and Maintenance

1. Mounting Position
   Install the sensor so that its sensing axis is correctly aligned with the intended conductive target.
2. Measurement Gap
   Establish the required operating gap according to the applicable sensor and monitoring-system installation requirements.
3. Target Surface
   The monitored target should provide a suitable conductive surface for eddy-current measurement.
4. Mechanical Fixing
   Secure the sensor and its mounting arrangement to prevent movement caused by machine vibration.
5. Cable Routing
   Route the sensor cable away from unnecessary mechanical stress, excessive heat, and potential sources of electrical interference.
6. Signal Converter Connection
   Confirm that the sensor is connected to the appropriate signal-conditioning equipment before commissioning.
7. Initial Commissioning
   Verify the sensor position and measurement signal while the machine is in a controlled commissioning condition.
8. Signal Verification
   Compare the measured signal with the expected machine operating condition and check for abnormal fluctuations.
9. Vibration Environment
   Inspect the mounting hardware periodically, particularly on machines with significant vibration or thermal cycling.
10. Cable Inspection
    Check the cable and connection points for damage, looseness, contamination, or mechanical wear.
11. Monitoring System Checks
    Confirm that the connected monitoring channel correctly receives and processes the sensor signal.
12. Replacement and Calibration
    When replacing a sensor, reproduce the approved mounting position and measurement setup rather than relying only on the previous physical position.

Compatible System Components

Recommended Related Models

Key Advantages

• Non-contact measurement avoids physical contact with the rotating target.
• Suitable for continuous shaft-position and displacement monitoring.
• Compact sensing head for integration into machinery measurement arrangements.
• Supports condition-monitoring and machinery-protection architectures.
• Applicable to a broad range of industrial rotating equipment.
• Can be integrated with associated Epro signal-conditioning and monitoring equipment.

Technical FAQs

What type of measurement is the PR6424/001-021 used for?

The PR6424/001-021 is an eddy-current sensor intended for non-contact measurement of conductive targets. In rotating machinery applications, it can be used to monitor shaft position, displacement, and related mechanical movement.

How does the PR6424/001-021 connect to a machinery monitoring system?

The sensor is normally connected to compatible signal-conditioning equipment. The conditioned signal can then be supplied to a machinery monitoring or protection system for measurement processing, alarms, and machine-status evaluation.

What should be considered when installing the sensor near a rotating shaft?

The sensor alignment, measurement gap, target surface, mounting rigidity, cable routing, and environmental conditions should all be checked. The installation should follow the requirements of the complete sensor and signal-conditioning arrangement.

Can the PR6424/001-021 be used for continuous machinery monitoring?

Yes. Its non-contact sensing principle makes it suitable for continuous measurement applications on rotating equipment, where shaft movement or displacement needs to be monitored during normal machine operation.