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- PR6424/007-101
- 16 mm Eddy Current Sensor
- Germany
- 16 mm
- 0.2 kg
- Xiamen, China
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1. Product Overview
The Epro PR6424/007-101 16 mm Eddy Current Sensor is a non-contact displacement measurement probe designed for industrial machinery monitoring applications. As part of the Epro PR6424 family, it is intended for measuring the relative movement between a sensor probe and a conductive metallic target, particularly the shaft surfaces of rotating machinery.
In power generation, petrochemical processing, oil and gas production, and other process industries, continuous monitoring of rotating equipment is essential for maintaining operational stability. Turbines, compressors, pumps, and other critical machines operate under changing loads, speeds, and thermal conditions. Abnormal shaft movement can indicate mechanical wear, rotor imbalance, misalignment, bearing problems, or other developing faults.
An eddy current sensor provides a way to monitor these conditions without physically contacting the rotating shaft. By detecting changes in the distance between the probe tip and the metallic target, the sensor supports shaft displacement and vibration measurement when installed as part of a compatible monitoring system.
The PR6424 series is commonly associated with machinery condition monitoring and protection systems. Its 16 mm sensing head is designed for applications that require a focused measurement area and reliable monitoring of larger rotating shafts.
The PR6424/007-101 is identified by its model number and 16 mm sensor head diameter. The listed product weight is approximately 0.2 kg. Before ordering a replacement, users should verify the complete model designation, cable arrangement, connector type, probe dimensions, and associated signal converter to ensure compatibility with the existing installation.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Epro |
| Model | PR6424/007-101 |
| Product Type | 16 mm Eddy Current Sensor |
| Sensor Head Diameter | 16 mm |
| Weight | 0.2 kg |
| Measurement Principle | Non-contact eddy current sensing |
| Primary Measurement Applications | Shaft displacement, relative vibration, and position |
| Typical Target | Conductive ferromagnetic metal |
| Typical Machinery | Turbines, compressors, pumps, fans, and generators |
| Signal Conditioning | Requires a compatible signal converter and monitoring arrangement |
| Installation | Machine-mounted probe installation according to the applicable system design |
The specifications above combine the supplied product identification details with general characteristics of the PR6424 sensor family. The precise cable length, connector configuration, probe insertion length, thread specification, and suffix-specific electrical characteristics should be confirmed against the product’s original documentation.
General PR6424 Series Performance Reference
The following values are published for the PR6424 sensor family. They should be treated as family-level reference specifications rather than an independent confirmation of every parameter for the PR6424/007-101 configuration.
| Performance Parameter | PR6424 Family Reference |
|---|---|
| Sensitivity/Linearity | 4 V/mm, with a stated linearity tolerance of up to ±1.5% |
| Nominal Center Air Gap | Approximately 2.7 mm |
| Static Measurement Range | ±2.0 mm |
| Dynamic Measurement Range | 0 to 1,000 μm peak-to-peak |
| Long-Term Drift | Less than 0.3% |
| Typical Target Material | Ferromagnetic steel |
| Reference Shaft Diameter | 80 mm or greater |
| Typical Operating Temperature Reference | Depends on the applicable specification revision and installation conditions |
| Sensor and 1 m Cable Weight Reference | Approximately 200 g in a documented configuration |
Actual operating limits depend on the specific probe configuration, signal converter, cable assembly, installation conditions, and applicable technical documentation. Confirm these parameters before using them as acceptance criteria for a replacement or new installation.
3. Function and Working Principle
The Epro PR6424/007-101 operates according to the eddy current measurement principle. This technology is widely used in industrial machinery monitoring because it enables displacement measurements without requiring direct mechanical contact between the sensor and the monitored shaft.
3.1 Generation of an Electromagnetic Field
The sensor probe contains an electromagnetic coil. When connected to a compatible signal converter, the coil is driven by an electrical excitation signal and generates an electromagnetic field around the sensing tip.
When a conductive metallic target, such as a steel shaft, enters this field, eddy currents are induced in the target material. These currents influence the electrical characteristics of the probe.
3.2 Detection of Distance Changes
The relationship between the probe and the metallic target changes as the shaft moves. This movement affects the coupling between the probe and the target, producing a measurable change in the sensor circuit.
A compatible converter interprets this change and generates a corresponding electrical output. Within the specified linear operating range, the output can be used to determine the relative distance between the probe and the shaft surface.
This measurement principle allows the system to detect small changes in shaft position and movement during machine operation.
3.3 Static Position and Dynamic Vibration Measurement
Eddy current measurement systems can support different monitoring functions depending on their configuration.
Static position measurement is used to observe the relative position of a shaft or another metallic target. This can be important when evaluating axial displacement, shaft position, or changes in operating clearances.
Dynamic displacement measurement is used to observe repetitive shaft movement. When the probe is installed in an appropriate orientation and connected to suitable monitoring electronics, the resulting signal can be used to evaluate shaft vibration.
The same general technology can therefore support both machine protection and condition-monitoring applications. The actual measurement function depends on the probe arrangement, converter, signal processing, and monitoring equipment.
4. Role in Industrial Control and Machinery Protection Systems
The PR6424/007-101 is a sensing component rather than a complete machinery protection system. Its value comes from its role in a wider measurement chain.
A typical arrangement includes the following elements:
- Eddy current probe: Installed near the target shaft to detect changes in relative position.
- Extension cable or connection assembly: Connects the probe to compatible measuring electronics where required.
- Signal converter: Converts the probe’s electrical response into a usable measurement signal.
- Monitoring equipment: Processes the measurement, displays operating conditions, and evaluates alarm or trip limits where configured.
- Control or protection interface: Provides relevant information to plant operators or connected systems.
When properly integrated, the measurement chain can provide information about the mechanical behavior of critical rotating equipment.
For example, a monitoring system may compare shaft vibration measurements with configured alarm thresholds. If the measured vibration increases beyond an established limit, the system can alert operators to investigate the machine. A protection system may also initiate a shutdown when its configured trip conditions are satisfied.
These actions are performed by the monitoring and protection equipment, not by the sensor alone.
The quality of the measurement depends on the entire installation. Probe condition, mounting rigidity, target material, cable integrity, converter compatibility, electrical grounding, and calibration all influence the reliability of the final signal.
5. Industrial Applications
5.1 Steam and Gas Turbines
Turbines contain high-speed rotating assemblies that require continuous monitoring. Changes in shaft vibration or position may be associated with rotor imbalance, bearing degradation, thermal distortion, or other mechanical conditions.
A compatible PR6424 measurement arrangement can provide shaft-related data for machinery monitoring and protection systems. This information helps maintenance personnel assess operating trends and investigate abnormal readings.
5.2 Hydro Turbines and Generators
Hydroelectric generating equipment operates under varying hydraulic loads and operating conditions. Shaft movement and relative displacement measurements can contribute to the assessment of mechanical stability.
In a properly designed monitoring system, non-contact probes can help detect changes in the behavior of large rotating shafts without adding mechanical contact to the measurement point.
5.3 Industrial Compressors
Compressors used in chemical processing, natural gas transportation, refining, and other industrial operations may be critical to continuous production.
Monitoring shaft displacement and vibration helps operators evaluate the mechanical condition of compressor assemblies. When combined with bearing temperature, process pressure, and other operating measurements, vibration information can support maintenance planning and fault investigation.
5.4 Pumps and Fans
Large pumps and industrial fans may operate continuously in demanding environments. Changes in shaft movement can be associated with imbalance, wear, misalignment, or deteriorating mechanical components.
An eddy current probe can provide a non-contact measurement point for suitable rotating machinery. Correct mounting and compatibility with the selected monitoring system remain essential.
5.5 Oil and Gas Facilities
Oil and gas plants depend on rotating equipment for compression, pumping, power generation, and process support. Unexpected machinery failure can cause production interruptions and increase maintenance costs.
Where supported by the machine design and monitoring architecture, shaft displacement measurements can help maintenance teams recognize abnormal operating trends and plan inspections before a developing issue results in a major failure.
5.6 Industrial Power and Process Plants
Power stations and process facilities often integrate machinery monitoring with distributed control systems, plant information systems, or dedicated protection platforms.
The PR6424/007-101 can serve as a field-level measurement component within a compatible monitoring arrangement. Its measurement data can support maintenance decisions and machinery protection functions when the associated electronics and system configuration are correctly selected.
6. Installation and System Integration
Correct installation is essential to achieving reliable and repeatable measurement results. Before installing the PR6424/007-101, maintenance personnel should review the machine drawings, probe mounting requirements, wiring documentation, and the technical specifications of the existing monitoring system.
6.1 Verify the Complete Model Number
Confirm the complete part number printed on the sensor label and compare it with the existing installation records.
The PR6424 family includes different configurations. Similar-looking probes may differ in cable arrangement, total length, connector type, and other ordering characteristics. A matching sensor head diameter alone does not establish interchangeability.
6.2 Confirm Mechanical Dimensions
Check the probe’s thread, insertion length, mounting arrangement, and available clearance. The sensing tip must be positioned according to the applicable installation procedure.
Incorrect probe positioning can produce inaccurate readings or place the probe outside its intended measurement range. Mechanical clearance must also account for expected shaft movement and operating conditions.
6.3 Check Target Material and Surface Condition
Eddy current measurement performance depends on the electrical and magnetic properties of the target material. Use the target material specified for the applicable PR6424 configuration.
The shaft surface should be suitable for the intended measurement. Surface damage, unsuitable materials, or installation conditions that differ from the system’s calibration assumptions can affect the output.
6.4 Verify the Converter and Connection Assembly
The sensor must be paired with compatible measuring electronics. Confirm the converter model, connection type, cable assembly, and required electrical parameters before energizing the system.
Do not assume that a probe can be connected directly to a PLC analog input or to an arbitrary vibration-monitoring channel. The correct signal-conditioning equipment is determined by the measurement system design.
6.5 Establish the Correct Probe Gap
Set the initial probe-to-target gap according to the applicable manufacturer instructions. A correct gap allows the sensor and converter to operate within the intended measurement range.
The gap should be checked using the prescribed installation method and suitable instrumentation. Avoid relying on approximate visual positioning where a defined electrical or mechanical setting procedure is required.
6.6 Inspect Wiring and Environmental Protection
Inspect the cable, connector, protective routing, and grounding arrangements. Keep the cable away from potential sources of mechanical damage and follow the installation requirements for electrical noise control.
Temperature, moisture, oil exposure, vibration, and other environmental conditions should be considered when selecting cable protection and routing methods.
6.7 Commission the Measurement Channel
After installation, verify that the signal converter produces the expected output and that the monitoring channel responds correctly.
Where appropriate, check the initial reading, scaling, polarity, alarm settings, and channel status. Record the results so that future measurements can be compared against an established baseline.
Any work involving machinery protection settings or trip functions should follow the site’s approved maintenance and commissioning procedures.
7. Compatible System Components
The PR6424/007-101 should be evaluated as part of a complete measurement chain. The following table identifies the main component categories to verify during system planning and replacement.
| Component | Function | Verification Requirement |
|---|---|---|
| PR6424/007-101 probe | Detects relative movement of the target | Confirm complete model and physical configuration |
| Extension cable, where applicable | Connects the probe to measuring electronics | Verify cable type, length, and electrical compatibility |
| Signal converter | Conditions the probe signal | Confirm compatibility with the exact probe configuration |
| Vibration or machinery monitor | Processes and evaluates measurement signals | Check channel type, input requirements, and configuration |
| Plant control or protection interface | Receives relevant monitoring information | Verify signal scaling, communication, and configured logic |
| Mounting hardware | Secures the probe in its installed position | Confirm thread, dimensions, clearances, and mechanical integrity |
Epro PR6424 systems are associated with compatible CON-series signal converters and other specified machinery monitoring electronics. However, the exact converter and cable arrangement must be confirmed against the relevant system documentation rather than selected solely by product-family name.
8. Recommended Alternative Models and Replacement Considerations
Selecting a replacement for an existing eddy current sensor requires more than matching its nominal diameter. Probe configurations may differ even when they belong to the same product family.
| Candidate or Category | Intended Evaluation | Important Consideration |
|---|---|---|
| Epro PR6424 series, matching configuration | Preferred starting point for like-for-like replacement | Confirm complete suffix, dimensions, cable, and connector |
| Epro PR6424 variant with a different suffix | Potential candidate when the original configuration is unavailable | Verify the full ordering code and electrical characteristics |
| Compatible probe and converter combination | Potential alternative where the complete measurement chain is being reviewed | Confirm calibration, sensitivity, measurement range, and system approval |
| Other manufacturer’s eddy current sensor | Consider only when a system-level replacement is acceptable | Evaluate mechanical fit, electrical interface, calibration, and protection-system requirements |
A different PR6424 model should not automatically be treated as a direct replacement for the PR6424/007-101. Likewise, a sensor from another manufacturer may require a different converter, revised mounting arrangements, new calibration, or changes to the monitoring channel.
Before purchasing a substitute, compare the original and proposed products using the following checklist:
- Complete manufacturer part number and suffix.
- Sensor head diameter and probe body dimensions.
- Thread type and insertion length.
- Cable length, cable construction, and connector type.
- Sensitivity, linear measurement range, and nominal gap.
- Compatible converter and monitoring equipment.
- Environmental and temperature requirements.
- Applicable machinery protection and site approval requirements.
For critical turbine or compressor protection channels, replacement decisions should be reviewed by qualified instrumentation or machinery protection personnel.
9. Key Advantages of Eddy Current Measurement
Non-Contact Measurement
The probe measures the relationship between the sensing tip and a conductive target without physically touching the rotating shaft. This makes the technology suitable for continuous monitoring of shaft movement.
Support for Critical Machinery Monitoring
Shaft displacement measurements can provide useful information about the mechanical condition of turbines, compressors, pumps, and other rotating equipment.
Measurement of Small Relative Movements
The PR6424 family is designed for applications involving relatively small changes in shaft position and movement. Within its specified operating range, the system can support detailed analysis of shaft behavior.
Integration into a Larger Monitoring Architecture
When connected to compatible signal-conditioning and monitoring equipment, the probe can form part of a machinery condition-monitoring or protection system.
Suitability for Industrial Environments
The PR6424 family is designed for industrial machinery applications. The suitability of a particular configuration depends on its documented environmental limits, installation method, and the requirements of the intended application.
Support for Maintenance Planning
Reliable shaft measurement data can help maintenance teams establish operating baselines, track changes over time, and investigate abnormal machine behavior. These benefits depend on proper installation, signal quality, and interpretation of the monitoring data.
10. Technical FAQs
Q1. What is the Epro PR6424/007-101?
The Epro PR6424/007-101 is identified as a 16 mm eddy current sensor. It belongs to the PR6424 family of non-contact probes used for displacement and rotating machinery monitoring applications.
Q2. What is the sensor head diameter?
The stated sensor head diameter is 16 mm. The probe’s overall length, thread dimensions, and mounting requirements should be checked separately.
Q3. What is the weight of the PR6424/007-101?
The supplied product specification lists a weight of 0.2 kg. Confirm whether this value refers to the sensor assembly alone or includes the cable and associated accessories when calculating shipping or installation requirements.
Q4. What can an eddy current sensor measure?
Depending on its installation and associated electronics, an eddy current sensor can measure the relative distance between the probe and a conductive target. In rotating machinery applications, this measurement can support shaft displacement, relative vibration, and position monitoring.
Q5. Does the sensor operate without physical contact?
Yes. Eddy current technology detects changes in the electromagnetic interaction between the probe and a conductive metallic target. The sensing tip does not need to contact the rotating shaft during normal measurement.
Q6. Can the PR6424/007-101 connect directly to a PLC?
Direct connection should not be assumed. A compatible signal converter or designated interface is normally required to condition the probe signal. The exact connection arrangement depends on the selected probe configuration and the system design.
Q7. Which machines can use this type of sensor?
Suitable applications may include steam turbines, gas turbines, hydro turbines, compressors, pumps, fans, and generators. Final suitability depends on the machine design, measurement objective, probe configuration, and monitoring equipment.
Q8. Can another PR6424 model replace the PR6424/007-101?
Possibly, but interchangeability must be verified. Check the complete ordering code, dimensions, cable and connector details, sensitivity, measurement range, and converter compatibility before making a substitution.
Q9. What should be checked before ordering?
Verify the exact model number, product condition, cable arrangement, connector, probe dimensions, weight, and compatibility with the installed monitoring system. For urgent maintenance, comparing the existing unit’s label and physical configuration with the proposed replacement is especially important.
Q10. Why is correct probe installation important?
Incorrect positioning, an unsuitable measurement gap, damaged wiring, or an incompatible converter can result in unreliable readings. Following the applicable installation and commissioning procedure helps ensure that the monitoring system operates as intended.
11. Procurement and Replacement Considerations
When sourcing the Epro PR6424/007-101, buyers should confirm the complete part number and identify the configuration required by the existing installation. This is particularly important for facilities that maintain older machinery monitoring systems or need to replace a sensor without redesigning the measurement channel.
The purchasing process should include verification of product identification, physical condition, connector configuration, cable length, and any required documentation. If the sensor is intended for a critical machine, it is also advisable to confirm that the replacement is acceptable for the existing converter and protection channel.
For international procurement, buyers may also wish to confirm packaging dimensions, shipping weight, lead time, warranty terms, and export documentation with the supplier.
A replacement should not be selected solely because the product description contains the words “16 mm Eddy Current Sensor.” The complete model suffix and associated system requirements are essential to reducing the risk of an incompatible installation.
12. Conclusion
The Epro PR6424/007-101 16 mm Eddy Current Sensor is a non-contact sensing component intended for industrial displacement and rotating machinery monitoring applications. With a stated sensor head diameter of 16 mm and a listed weight of 0.2 kg, it can be evaluated for use in compatible shaft measurement arrangements.
Its practical value depends on correct mechanical installation, suitable target material, compatible signal-conditioning electronics, and integration with the appropriate monitoring system. For maintenance teams and industrial equipment buyers, verifying the complete model designation and configuration is the most important step when sourcing a replacement.
By confirming these details before purchase and commissioning, users can reduce compatibility risks and support reliable machinery monitoring in power generation, oil and gas, petrochemical processing, and other industrial environments.