1. Product Overview

The Epro PR6424/005-100 16 mm Eddy Current Sensor is an industrial non-contact sensor designed for displacement measurement and rotating machinery condition monitoring. As part of the EPRO PR6424 product family, it is intended for measurement systems that monitor shaft displacement, relative position, vibration, and other mechanical characteristics of suitable rotating equipment.

The supplied product information specifies a sensor head diameter of 16 mm and an approximate weight of 0.2 kg. The eddy current measurement principle allows the probe to detect changes in the distance between its sensing tip and a suitable conductive target without physically contacting the moving component. This makes the technology useful for monitoring rotating machinery where continuous measurement is required.

Typical applications for the PR6424 sensor family include steam turbines, gas turbines, hydroelectric generating equipment, compressors, pumps, fans, and other rotating machinery. In these applications, changes in shaft position and vibration can provide information about operating conditions and possible mechanical abnormalities.

The sensor is normally integrated into a complete measurement chain. Depending on the selected configuration, the system may include the probe, an extension cable, a compatible signal converter, and a machinery monitoring module. The probe detects changes in the gap between the sensing tip and the target surface, while the associated electronics condition the signal for monitoring and analysis.

For maintenance engineers, system integrators, and industrial spare-parts buyers, correct model identification is essential. The complete PR6424/005-100 ordering code should be checked against the relevant product documentation to confirm cable configuration, connector type, mounting dimensions, calibration characteristics, and compatibility with the existing monitoring system.

2. Technical Specifications

The table below separates the supplied product information from general PR6424 family reference characteristics.

Technical note: The 16 mm sensor head diameter and approximate 0.2 kg weight are based on the supplied product information. The measurement range, sensitivity, center air gap, and frequency range are PR6424 family reference values rather than independently verified specifications for every PR6424/005-100 configuration. Confirm the exact model documentation before using these values for engineering approval or procurement.

3. Function and Working Principle

3.1 Eddy Current Measurement Principle

The PR6424 sensor family uses electromagnetic induction to measure the relative distance between the probe and a suitable conductive target.

The probe generates an alternating electromagnetic field around its sensing tip. When a conductive target enters this field, eddy currents develop in the target surface. These currents influence the electrical response of the probe.

As the distance between the probe and target changes, the probe response changes. Compatible signal conditioning equipment processes this response and converts it into a measurement signal representing the gap or relative displacement.

Because the sensor does not need to touch the target, eddy current technology is suitable for monitoring moving shafts and other rotating components.

3.2 Shaft Displacement Measurement

Shaft displacement measurement provides information about the relative position of a rotating shaft. Changes in position may be associated with bearing clearance, thermal expansion, load variation, alignment changes, or other mechanical conditions.

When installed at an appropriate measurement point, the sensor detects changes in the gap between its sensing tip and the shaft surface. The resulting measurement can be used by compatible monitoring equipment to track shaft movement and identify deviations from expected operating behavior.

3.3 Shaft Vibration Monitoring

Vibration monitoring is an important part of rotating machinery maintenance. Changes in shaft vibration may be associated with imbalance, misalignment, mechanical looseness, bearing-related problems, or other equipment issues.

An eddy current probe can detect dynamic shaft displacement when installed in a suitable measurement arrangement. The connected monitoring equipment processes the signal so engineers can evaluate vibration trends and investigate abnormal operating patterns.

3.4 Signal Conditioning and Processing

The sensor probe is generally one component of a complete measurement system. Depending on the specific configuration, a compatible signal converter may be required to condition the probe signal for the monitoring equipment.

A typical system may include:

• Epro PR6424/005-100 sensor probe
• Compatible extension cable, where required
• Signal converter
• Machinery monitoring module
• Operator interface or machinery protection system

The appropriate cable, converter, and monitoring interface must be selected according to the exact sensor configuration and system requirements.

4. Role in Industrial Control and Machinery Protection Systems

The Epro PR6424/005-100 provides measurement information for use by compatible machinery monitoring equipment. Alarm processing, protection logic, and shutdown actions are handled by the connected system according to the plant’s engineering design.

4.1 Continuous Condition Monitoring

Industrial rotating equipment may operate for long periods under changing loads and process conditions. Continuous shaft displacement measurement helps maintenance teams observe machine behavior during startup, normal operation, changes in load, and shutdown.

When connected to suitable monitoring equipment, the sensor contributes data that can be evaluated alongside other operating parameters.

4.2 Alarm and Protection Integration

Sensor measurements may be used as inputs for configurable alarm and protection functions. Engineering teams determine appropriate thresholds and responses according to equipment requirements, operating limits, and the plant’s approved protection design.

The sensor itself should not be considered an independent alarm controller or shutdown device.

4.3 Integration With Plant Automation

Processed measurement values can be integrated into a wider industrial automation architecture through compatible monitoring equipment and signal interfaces.

This allows maintenance personnel to compare shaft movement with operating variables such as speed, temperature, pressure, and load. Such comparisons can support troubleshooting and help distinguish mechanical changes from process-related variations.

5. Industrial Applications

5.1 Steam Turbines

Steam turbines require monitoring of shaft displacement and vibration to help evaluate mechanical stability during operation. A suitable eddy current measurement system can provide non-contact measurements of shaft movement and contribute to machinery condition monitoring.

5.2 Gas Turbines

Gas turbines operate under demanding thermal and mechanical conditions. Shaft displacement measurements can contribute to monitoring systems that assess rotor behavior and changes in vibration.

5.3 Hydroelectric Generating Equipment

Hydroelectric turbine-generator assemblies experience varying loads and operating conditions. Shaft displacement monitoring can provide useful information for evaluating shaft alignment and mechanical behavior.

5.4 Industrial Compressors

Compressors used in refineries, petrochemical plants, gas processing facilities, and manufacturing operations often require continuous condition monitoring. Eddy current sensors can provide displacement measurements for suitable compressor monitoring systems.

5.5 Pumps and Fans

Pumps and fans are widely used in water treatment, power generation, chemical processing, and general manufacturing. Where the equipment design requires non-contact shaft displacement measurement, a compatible sensor can contribute useful operating data.

5.6 General Rotating Machinery

The PR6424 family may also be considered for other suitable rotating machinery. Selection depends on the target material, shaft diameter, installation geometry, environmental conditions, and required measurement performance.

6. Installation and System Integration

Correct installation is essential for reliable and repeatable measurement.

6.1 Verify the Exact Model Configuration

Before installation, confirm the complete PR6424/005-100 ordering code and its corresponding technical documentation. Check the probe length, mounting thread, cable configuration, connector type, and compatible signal converter.

Do not assume that sensors with similar model numbers have identical mechanical dimensions or electrical characteristics.

6.2 Select the Mounting Position

Choose a stable mounting location where the probe can face the intended target surface. The mounting structure should minimize unwanted movement and provide sufficient clearance around the sensor body and cable connection.

Follow the manufacturer’s installation requirements for the specific probe configuration.

6.3 Set the Measurement Gap

The gap between the sensor tip and target determines the operating point within the measurement range. Set the gap according to the applicable installation instructions and calibration procedure.

A typical family-level air-gap value is a reference only and should not replace the instructions for the actual sensor and converter combination.

6.4 Verify Target Material and Geometry

The performance of an eddy current sensor depends on target material and geometry. Confirm that the shaft material, diameter, surface condition, and measurement location are suitable for the selected measurement system.

If target characteristics differ from the standard reference arrangement, additional compatibility checks or calibration may be required.

6.5 Connect the Signal Converter

Use the specified cable and compatible signal conditioning equipment. Confirm connector compatibility, cable length, grounding requirements, and signal interfaces before commissioning.

Route sensor wiring according to the manufacturer’s recommendations and take appropriate measures to reduce electrical interference.

6.6 Commission the Complete System

After installation, verify the probe gap, signal response, converter settings, and monitoring channel configuration. Confirm that the measurement behaves as expected throughout the required operating range.

Any associated alarm and protection functions should be tested as part of the wider machinery monitoring system commissioning procedure.

7. Compatible System Components

The PR6424/005-100 should be evaluated as part of a complete measurement chain. Compatibility depends on the exact probe configuration and the requirements of the connected monitoring equipment.

Before purchasing additional components, confirm the complete measurement chain. Cable configuration, connector type, converter compatibility, and calibration requirements should be checked together.

8. Recommended Alternative Models

The following models are examples for comparison within the EPRO sensor portfolio. They are not guaranteed direct replacements for PR6424/005-100.

Alternative selection should be based on the complete part number, mechanical dimensions, measurement characteristics, cable and connector configuration, converter compatibility, target material, and operating environment. A shared product family or similar probe diameter does not guarantee interchangeability.

9. Key Advantages

Non-Contact Measurement

The sensor measures the distance between the probe and target without direct physical contact. This is suitable for monitoring moving components without introducing contact wear during normal measurement.

Suitable for Rotating Machinery Monitoring

The PR6424 family is intended for shaft displacement and vibration measurement in suitable rotating machinery applications, including turbines, compressors, pumps, and fans.

Supports Multiple Measurement Applications

Depending on the system configuration, the sensor can contribute to shaft displacement, position, vibration, and eccentricity monitoring.

Compact Sensor Head

The specified 16 mm sensor head diameter provides a useful dimensional reference for installation planning and replacement assessment.

Integration With Monitoring Equipment

When combined with compatible signal conditioning and monitoring modules, the sensor can contribute to a wider machinery condition monitoring and protection arrangement.

Supports Condition-Based Maintenance

Measurement trends can help engineers identify changes in machine behavior, investigate abnormal patterns, and prioritize maintenance activities based on equipment condition.

10. Technical FAQs

Q1. What is the Epro PR6424/005-100?

It is a 16 mm eddy current sensor in the EPRO PR6424 family, intended for non-contact measurement applications involving rotating machinery.

Q2. What is the sensor head diameter?

The supplied product information specifies a sensor head diameter of 16 mm.

Q3. What is the product weight?

The supplied information lists the weight as approximately 0.2 kg. Confirm whether the stated weight includes the cable or accessories when planning shipment or installation.

Q4. How does the sensor measure displacement?

The probe generates an alternating electromagnetic field. A conductive target affects the probe response, and compatible signal conditioning equipment processes that response to determine the relative gap or displacement.

Q5. Can the sensor be used for shaft vibration monitoring?

The PR6424 family is intended for non-contact shaft displacement and vibration measurement. The probe must be used with compatible signal conditioning and monitoring equipment.

Q6. What is the typical measurement range?

PR6424 family information lists a typical static range of ±2.0 mm and a dynamic range of 0–1,000 μm for a standard configuration. Confirm the values applicable to PR6424/005-100 before using them in an engineering design.

Q7. Does the sensor require a signal converter?

A compatible signal converter is generally part of the complete PR6424 measurement system. The required converter depends on the exact sensor configuration and connected monitoring equipment.

Q8. Can PR6424/005-100 replace another PR6424 model?

Not automatically. Verify mechanical dimensions, cable and connector configuration, calibration characteristics, and converter compatibility before replacing another model.

Q9. Which industries use this type of sensor?

Potential applications include power generation, oil and gas, petrochemical processing, industrial manufacturing, and facilities that monitor critical rotating equipment.

Q10. What should be checked before ordering?

Confirm the full model number, sensor head diameter, probe length, mounting thread, cable length, connector type, compatible converter, target material, operating environment, and required measurement performance.

11. Conclusion

The Epro PR6424/005-100 16 mm Eddy Current Sensor is intended for non-contact displacement measurement in industrial machinery monitoring systems. Its specified sensor head diameter of 16 mm and approximate weight of 0.2 kg provide useful initial information for product identification and installation planning.

When used with compatible signal conditioning and monitoring equipment, the sensor can contribute to shaft displacement, vibration, position, and eccentricity monitoring in suitable rotating machinery. These measurements can support condition assessment, maintenance planning, and the wider machinery protection strategy.

For replacement procurement or new installations, verify the exact PR6424/005-100 configuration and its compatibility with the existing measurement chain. Confirming probe dimensions, cable and connector arrangements, signal converter requirements, and applicable technical specifications helps reduce integration risk and supports reliable operation.