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- PR6424/008-000
- 16 mm Eddy Current Sensor
- Germany
- 16 mm
- 0.2 kg
- Xiamen, China
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1. Product Overview
The Epro PR6424/008-000 16 mm Eddy Current Sensor is a non-contact sensing probe intended for industrial machinery measurement and condition-monitoring applications. The Epro PR6424 family is designed for use with critical rotating equipment, where accurate monitoring of shaft movement and position helps support reliable plant operation.
Industrial facilities depend on turbines, compressors, pumps, generators, and other rotating machinery to maintain continuous production. Mechanical changes caused by wear, imbalance, misalignment, or changing operating conditions can affect equipment performance. Continuous measurement of shaft displacement and vibration provides useful information for evaluating machinery condition and identifying abnormal operating trends.
An eddy current sensor measures the distance between its sensing tip and a suitable conductive metallic target without making physical contact. When installed near a rotating shaft and connected to compatible signal-conditioning equipment, it can provide measurement information about changes in the relative position of the shaft.
The PR6424 series is associated with machinery monitoring applications in power generation, oil and gas, petrochemical processing, and other process industries. Its 16 mm sensor head provides a defined sensing-head diameter for installation planning.
The supplied product information identifies the PR6424/008-000 as a 16 mm eddy current sensor with a listed weight of 0.2 kg. The exact probe dimensions, cable arrangement, connector, mounting thread, and electrical configuration should be verified against the actual unit and applicable product documentation before purchase or installation.
A sensor should not be evaluated solely by its head diameter. The probe, cable, signal converter, and monitoring equipment must be compatible as a complete measurement chain to provide dependable results.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Epro |
| Model | PR6424/008-000 |
| Product Type | Eddy Current Sensor |
| Sensor Head Diameter | 16 mm |
| Weight | 0.2 kg |
| Measurement Principle | Non-contact eddy current sensing |
| Typical Measurement Applications | Shaft displacement, relative vibration, position, and eccentricity monitoring |
| Typical Target | Suitable conductive metallic surface |
| Typical Machinery | Turbines, compressors, pumps, fans, and generators |
| Signal Conditioning | Compatible signal converter or designated interface required |
| Installation | Machine-mounted probe installation |
| Configuration Verification | Confirm exact model, cable, connector, dimensions, and converter compatibility |
The model designation, sensor head diameter, and weight are based on the supplied product information. The following table provides general PR6424-family technical references, not independently verified specifications for every parameter of the PR6424/008-000 variant.
PR6424 Series Performance Reference
| Parameter | PR6424 Family Reference |
|---|---|
| Sensitivity/Linearity | 4 V/mm (101.6 mV/mil), linearity tolerance 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% |
| Standard Target Material | Ferromagnetic steel, with 42CrMo4 cited as a standard material |
| Reference Shaft Diameter | 80 mm or greater |
| Operating Temperature | Depends on the applicable specification revision and sensor configuration |
| Sleeve Material | Stainless steel in documented configurations |
| Cable Material | PTFE in documented configurations |
| Weight Reference | Approximately 200 g for a documented sensor with 1 m cable and no armor |
Before using family-level values for engineering calculations, confirm the exact specification applicable to the PR6424/008-000. Particular attention should be paid to probe length, cable arrangement, thread type, measurement range, and compatible converter.
3. Function and Working Principle
The Epro PR6424/008-000 belongs to the eddy current sensing category. This technology is commonly used for non-contact displacement measurement because it can detect changes in the distance between a probe and a conductive target during machine operation.
3.1 Electromagnetic Field Generation
The sensor probe contains an electromagnetic coil. When connected to compatible signal-conditioning electronics, the coil generates an alternating electromagnetic field around the sensing tip.
When a conductive metallic target enters this field, eddy currents are induced in the target. These currents influence the electrical characteristics of the probe and establish a relationship between the probe response and the distance to the target.
3.2 Non-Contact Distance Measurement
As the monitored shaft moves relative to the probe, the distance between the sensing tip and the shaft surface changes. This affects the electromagnetic interaction between the probe and the target.
The resulting electrical variation is processed by a compatible converter to generate a measurement signal. Within the specified operating range, the signal can represent changes in the relative distance between the probe and the target.
Because the probe does not need to contact the rotating shaft, this measurement method is suitable for continuous monitoring applications.
3.3 Shaft Displacement and Position
When installed in an appropriate orientation, an eddy current probe can measure changes in shaft position. Depending on the mounting arrangement, the measurement may be used to observe radial movement or axial displacement.
These measurements can help engineers evaluate changes in shaft location, mechanical clearance, and operating behavior. The specific measurement function depends on probe placement and the configuration of the monitoring system.
3.4 Dynamic Shaft Vibration
An eddy current sensor can also detect dynamic changes in the distance between the probe and the rotating shaft. A suitable monitoring system processes this signal to evaluate shaft vibration.
Changes in the vibration signal can indicate that the machine’s operating behavior has changed. However, the signal alone does not establish the cause of a mechanical problem. Engineers normally consider vibration measurements alongside machine speed, load, bearing conditions, temperature, and other relevant information.
4. Role in Industrial Automation and Machinery Protection
The PR6424/008-000 is a sensing component within a larger measurement arrangement. It does not independently perform all monitoring, alarm, or shutdown functions.
A typical installation may contain the following components:
- Eddy current probe: Detects the relative distance between the sensor and the metallic target.
- Cable and connection assembly: Transfers the probe signal to compatible electronics.
- Signal converter: Conditions the sensor response and produces a usable measurement output.
- Machinery monitoring equipment: Processes the measurement and evaluates it against configured limits.
- Control or protection interface: Communicates measurement information or alarm status to the plant control environment.
When the components are correctly matched, the measurement chain can provide information about shaft movement and machine condition.
For example, a turbine monitoring channel may track shaft vibration during normal operation. If the measured value changes significantly or exceeds an established alarm threshold, maintenance personnel can investigate the equipment.
A dedicated machinery protection system may use measurement signals to initiate alarms or shutdown actions when its configured conditions are met. These functions depend on the monitoring equipment, system configuration, and plant procedures—not on the sensor alone.
Reliable measurements require the correct probe configuration, suitable installation, compatible signal conditioning, and appropriate commissioning.
5. Industrial Applications
5.1 Steam Turbines
Steam turbines operate at high speeds and require monitoring of rotor movement and mechanical condition. Shaft displacement and vibration measurements can help operators recognize changes that may require investigation.
When integrated into a suitable monitoring arrangement, a PR6424-family sensor can provide shaft-related information for turbine condition monitoring and protection.
5.2 Gas Turbines
Gas turbines operate under demanding mechanical and thermal conditions. Shaft movement monitoring can help maintenance personnel assess operating trends and investigate abnormal measurements.
The suitability of the PR6424/008-000 for a specific turbine depends on its exact configuration, the installation environment, and the compatible monitoring equipment.
5.3 Hydro Turbines and Generators
Hydroelectric equipment operates under changing hydraulic loads and operating conditions. Shaft displacement monitoring can contribute to the assessment of mechanical stability and rotor behavior.
Non-contact sensing allows shaft movement to be measured without the probe touching the rotating component during normal operation.
5.4 Industrial Compressors
Compressors are essential in refining, gas transportation, chemical processing, and other continuous-process industries. Unexpected mechanical problems can result in production interruptions and expensive maintenance.
Shaft vibration and displacement information can support condition monitoring when evaluated alongside operating speed, pressure, bearing temperature, and other relevant measurements.
5.5 Pumps and Fans
Large pumps and industrial fans often operate continuously. Changes in shaft movement can indicate that further inspection may be required.
A correctly installed eddy current probe can provide a non-contact measurement point for suitable rotating equipment. The target material, probe location, and system configuration must meet the relevant requirements.
5.6 Oil and Gas Facilities
Oil and gas facilities rely on rotating equipment for pumping, compression, power generation, and process support. Machinery monitoring helps maintenance teams observe changes in operating behavior and plan inspections.
The PR6424 family may be used in appropriate machinery measurement arrangements, provided that the specific sensor configuration meets the application’s requirements.
5.7 Power Generation and Process Industries
Power stations, refineries, and chemical plants often use dedicated machinery monitoring systems to track critical rotating assets.
When integrated into a compatible measurement chain, an eddy current sensor can contribute shaft-related information to maintenance and protection workflows. Its effectiveness depends on the correct combination of probe, converter, monitoring equipment, and installation practices.
6. Installation and System Integration
Correct installation is essential for reliable and repeatable measurement. Before installing the PR6424/008-000, review the applicable product documentation, machine drawings, cable requirements, and existing monitoring-system configuration.
6.1 Verify the Complete Model Number
Check the full model number on the existing sensor and compare it with the proposed replacement. Variants within the PR6424 family may differ in probe dimensions, cable configuration, connector type, and other ordering characteristics.
The exact configuration of the PR6424/008-000 should be confirmed before installation rather than inferred from the family name alone.
6.2 Confirm Mechanical Dimensions
Verify the probe body dimensions, mounting thread, insertion length, and available installation clearance. The stated 16 mm sensor head diameter does not define the complete probe dimensions.
The probe must be securely mounted and positioned so that it cannot contact the rotating shaft under expected operating conditions.
6.3 Check Target Material
Eddy current measurement depends on the electromagnetic properties of the target. Confirm that the shaft material and surface condition are suitable for the applicable sensor configuration.
If the measurement system is calibrated for a particular target material, using a different material may affect the measurement response.
6.4 Inspect the Cable and Connector
Verify the cable length, cable type, connector, and physical condition. Ensure that the connection matches the required signal converter.
Cable routing should follow the site’s electrical and mechanical installation requirements. Avoid unnecessary tension, sharp bends, and locations where the cable could be damaged by heat, vibration, or moving components.
6.5 Verify Signal Converter Compatibility
Use a signal converter or designated interface that is approved for the exact probe configuration. Check the converter model and connection requirements before energizing the system.
Do not assume that the probe can be connected directly to a standard PLC analog input. The correct signal-conditioning arrangement depends on the sensor and monitoring-system design.
6.6 Set the Probe Gap
Position the sensor according to the applicable installation procedure. The initial probe gap must place the sensor within its intended measurement range and leave sufficient range for expected shaft movement.
An incorrect gap can cause unreliable readings or reduce the usable measurement range. Follow the prescribed setup method and use appropriate measuring equipment.
6.7 Commission the Measurement Channel
After installation, verify the signal and confirm that the monitoring channel responds correctly. Depending on the system, commissioning may include checking the baseline reading, signal scaling, polarity, channel status, and configured alarm limits.
Record the results to establish a reference for future maintenance. Any changes to machinery protection settings should follow approved site procedures and be completed by qualified personnel.
7. Compatible System Components
The PR6424/008-000 should be assessed as part of a complete measurement chain. The following table outlines the main component categories to review.
| Component | Function | Verification Requirement |
|---|---|---|
| PR6424/008-000 probe | Detects relative movement between the probe and target | Verify the complete model and physical configuration |
| Cable assembly | Transfers the probe signal to the electronics | Check cable length, construction, and connector |
| Signal converter | Conditions the probe signal | Confirm compatibility with the exact probe variant |
| Machinery monitoring system | Processes and evaluates measurement data | Verify channel type, input requirements, and configuration |
| Protection or control interface | Communicates measurement and alarm information | Check signal scaling and system logic |
| Mounting hardware | Secures the probe in position | Confirm thread, dimensions, clearance, and mechanical stability |
PR6424 measurement systems are associated with compatible Epro/Emerson CON-series signal converters. However, the exact converter model and cable arrangement must be confirmed against the applicable documentation and the existing installation.
A converter that works with one PR6424 configuration should not automatically be assumed compatible with every variant.
8. Alternative Models and Replacement Considerations
If the original PR6424/008-000 is unavailable, a replacement should be evaluated against the mechanical and electrical requirements of the installed measurement system.
| Replacement Candidate | Evaluation Approach | Important Consideration |
|---|---|---|
| Epro PR6424/008-000 with matching configuration | Preferred starting point for like-for-like replacement | Verify the complete part number and physical configuration |
| Another Epro PR6424 variant | Potential candidate if the original configuration cannot be sourced | Confirm dimensions, cable, connector, and electrical compatibility |
| Compatible probe and converter combination | Consider when reviewing the complete measurement chain | May require configuration checks and recommissioning |
| Alternative manufacturer’s eddy current system | Consider only after a system-level assessment | May require different electronics, calibration, and mounting arrangements |
A different PR6424 suffix should not automatically be treated as a direct replacement. Probes with the same nominal head diameter may differ in cable arrangement, insertion length, mounting thread, or electrical characteristics.
Before purchasing an alternative, compare:
- Complete manufacturer part number and suffix.
- Sensor head diameter and overall probe dimensions.
- Thread specification and insertion length.
- Cable length, construction, and connector.
- Sensitivity and measurement range.
- Compatible signal converter and monitoring equipment.
- Environmental and temperature requirements.
- Site requirements for machinery monitoring and protection.
For critical turbine, compressor, or generator installations, replacement decisions should be reviewed by qualified instrumentation or machinery protection personnel.
9. Key Advantages
Non-Contact Measurement
Eddy current technology measures the distance between a probe and a conductive target without physical contact during normal operation. This is useful for continuous monitoring of rotating shafts.
Support for Shaft Displacement Monitoring
When installed in an appropriate arrangement, the sensor can provide information about relative shaft movement and position.
Application in Critical Rotating Machinery
The PR6424 family is designed for machinery monitoring applications involving turbines, compressors, pumps, fans, and other rotating equipment.
Integration with Industrial Monitoring Systems
The sensor can serve as a field-level measurement component in a system containing a compatible converter and machinery monitoring equipment.
Support for Maintenance Planning
Consistent measurement data can help maintenance teams establish operating baselines, track changes over time, and identify conditions that require further investigation.
Defined Sensor Head Diameter
The stated 16 mm sensor head diameter provides a useful reference for installation planning. The full probe dimensions and mounting details should still be checked before ordering or installation.
10. Technical FAQs
Q1. What is the Epro PR6424/008-000?
The Epro PR6424/008-000 is identified as a 16 mm eddy current sensor for non-contact measurement applications. It belongs to the PR6424 family used in rotating machinery monitoring.
Q2. What is the sensor head diameter?
The supplied product information lists a sensor head diameter of 16 mm. This does not represent the overall probe length or mounting dimensions.
Q3. What is the weight of the PR6424/008-000?
The supplied specification lists the weight as 0.2 kg. Buyers should confirm whether the stated value includes the cable and connector when calculating shipping or installation requirements.
Q4. What does an eddy current sensor measure?
Depending on its configuration and installation, an eddy current sensor measures the relative distance between the probe and a conductive metallic target. In rotating machinery applications, this can support shaft displacement, position, and vibration monitoring.
Q5. Does the sensor contact the rotating shaft?
No. Eddy current sensing is a non-contact measurement method. The sensor detects changes in electromagnetic coupling between the probe and a suitable target.
Q6. Can the PR6424/008-000 connect directly to a PLC?
Direct connection should not be assumed. A compatible signal converter or designated interface is normally required. The appropriate connection depends on the exact probe configuration and monitoring-system design.
Q7. Which machines can use this type of sensor?
Typical applications for the PR6424 family include steam turbines, gas turbines, hydro turbines, compressors, pumps, fans, and generators. Final suitability depends on the specific application, installation environment, and associated electronics.
Q8. Can another PR6424 model replace the PR6424/008-000?
Another variant may be a candidate, but interchangeability must be verified. Compare the complete model number, physical dimensions, cable and connector details, electrical characteristics, and converter compatibility.
Q9. What should buyers verify before ordering?
Confirm the complete model number, sensor head diameter, probe dimensions, cable arrangement, connector, product condition, and compatibility with the existing monitoring system.
Q10. Why is the complete model number important?
The complete model number identifies the intended configuration. Sensors from the same product family may have different mechanical or electrical characteristics and should not be treated as interchangeable without verification.
11. Procurement and Replacement Considerations
When sourcing the Epro PR6424/008-000, buyers should confirm the complete ordering code and the configuration required by the existing machinery monitoring system.
For replacement projects, compare the label and physical configuration of the installed sensor with the proposed item. Pay particular attention to the cable arrangement, connector, probe dimensions, mounting thread, and compatible signal converter.
For international procurement, buyers may also need to confirm product condition, packaging, shipping weight, lead time, warranty terms, and export documentation with the supplier.
If the sensor is installed in a critical machinery protection channel, confirm that the replacement is suitable for the existing measurement and protection arrangement. Calibration, functional testing, and recommissioning should follow the facility’s approved procedures.
A product listing that only states “16 mm Eddy Current Sensor” does not establish full compatibility. Verifying the complete model number and associated system requirements helps reduce the risk of ordering an unsuitable replacement.
12. Conclusion
The Epro PR6424/008-000 16 mm Eddy Current Sensor is a non-contact sensing component intended for industrial machinery measurement applications. The supplied product information identifies a 16 mm sensor head diameter and a listed weight of 0.2 kg.
When integrated with compatible signal-conditioning and monitoring equipment, an eddy current sensor can provide useful information about shaft displacement, relative movement, and vibration. Its practical performance depends on the exact probe configuration, target material, mounting arrangement, signal converter, and monitoring system.
For maintenance teams and industrial equipment buyers, verifying the complete model number and associated connection details is essential when sourcing a replacement. Careful compatibility checks can help reduce installation risks and support reliable machinery monitoring in power generation, oil and gas, petrochemical processing, and other industrial applications.