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- PR6424/007-121
- 16 mm Eddy Current Sensor
- Germany
- 16 mm
- 0.2 kg
- Xiamen, China
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1. Product Overview
The Epro PR6424/007-121 16 mm Eddy Current Sensor is a non-contact displacement sensor designed for industrial machinery monitoring applications. As part of the Epro PR6424 sensor family, it is used in measurement arrangements designed to monitor shaft displacement, relative vibration, position, and other mechanical parameters of rotating equipment.
Rotating machinery is essential to many industrial processes. Steam turbines, gas turbines, generators, compressors, pumps, and large fans must operate reliably under changing loads and operating conditions. Mechanical changes such as rotor imbalance, shaft misalignment, bearing deterioration, and abnormal displacement can affect machine performance and may lead to unplanned maintenance if not identified in time.
An eddy current sensor provides a non-contact method for measuring the distance between a probe and a conductive metallic target. When installed near a suitable shaft surface and connected to compatible signal-conditioning equipment, the sensor can provide information about changes in the relative position of the target.
The PR6424 series is designed for critical rotating machinery applications where reliable shaft measurement is important. Its 16 mm sensing head provides a defined sensor-head diameter for installation planning. The product information supplied for the PR6424/007-121 lists a weight of 0.2 kg.
When sourcing this model, buyers should verify the complete part number, probe body dimensions, mounting thread, cable length, connector configuration, and compatibility with the existing signal converter. A similar sensor diameter does not necessarily mean that two probes are mechanically or electrically interchangeable.
The PR6424/007-121 should be evaluated as part of a complete measurement chain that may include a probe, cable assembly, signal converter, and machinery monitoring equipment. Correct component matching is essential for obtaining reliable measurement results.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Epro |
| Model | PR6424/007-121 |
| Product Type | 16 mm 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, and position monitoring |
| Typical Target | Suitable conductive metallic surface |
| Typical Equipment | Turbines, compressors, pumps, fans, and generators |
| Signal Conditioning | Compatible signal converter or designated interface required |
| Installation Type | Machine-mounted probe installation |
| Configuration Verification | Confirm cable, connector, thread, and dimensions against the exact model |
The model designation, sensor head diameter, and weight above follow the supplied product information. The following PR6424 family data provides technical context, but suffix-specific characteristics for the complete PR6424/007-121 model should be confirmed against the applicable product documentation.
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 Reference | Published family specifications include ranges up to -35 to +180°C, depending on the applicable specification |
| 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 |
These figures are family-level reference values, not a substitute for the exact datasheet. Actual performance depends on the sensor configuration, target material, cable arrangement, signal converter, calibration, and installation conditions.
3. Function and Working Principle
The Epro PR6424/007-121 uses the eddy current measurement principle. This technology is widely used in rotating machinery monitoring because it can detect small changes in the distance between a sensor probe and a conductive target without physical contact.
3.1 Electromagnetic Field Generation
The sensor probe contains an electromagnetic coil. When connected to a compatible signal converter, 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 material. These currents affect the electrical characteristics of the probe and create a measurable relationship between the probe response and the distance to the target.
3.2 Distance and Displacement Detection
As a shaft moves relative to the probe, the gap between the sensor tip and the shaft surface changes. The electromagnetic coupling changes accordingly, causing a variation in the probe’s electrical response.
A compatible converter processes this variation and produces a usable measurement signal. Within the specified linear measurement range, this signal can represent changes in the relative position of the shaft.
This non-contact method is useful in applications where a shaft must be monitored continuously while the machine is operating.
3.3 Shaft Position Monitoring
A sensor installed at a suitable location can measure relative shaft position. Depending on the mounting arrangement, the measurement may be used to observe radial displacement or axial movement.
Position monitoring can help engineers evaluate changes in operating clearances, shaft alignment, and mechanical behavior. The interpretation of these measurements depends on the machine design and the location of the sensing probe.
3.4 Shaft Vibration Measurement
When the probe is positioned appropriately, dynamic changes in the distance between the probe and the shaft can be used to assess shaft vibration.
The signal converter and monitoring system process the sensor response to provide information about shaft movement over time. Engineers can compare this information with established operating baselines and configured alarm limits.
A vibration signal does not independently identify every possible mechanical fault. It should be evaluated alongside other measurements, machine operating conditions, and maintenance findings.
4. Role in Industrial Automation and Machinery Protection
The PR6424/007-121 is a sensing component rather than a complete monitoring or protection device. Its function is to provide measurement information to compatible signal-conditioning and monitoring equipment.
A typical measurement arrangement may include:
- Eddy current sensor: Detects changes in the distance between the probe and the metallic target.
- Cable and connector assembly: Transfers the sensor signal to the associated electronics.
- Signal converter: Conditions the probe signal and provides the required measurement output.
- Machinery monitoring equipment: Processes the measurement and evaluates it against configured operating limits.
- Control or protection interface: Communicates relevant status information to operators or connected plant systems.
When the measurement chain is correctly configured, the sensor can contribute to continuous monitoring of rotating machinery.
For example, a turbine monitoring channel may track shaft vibration during normal operation. If the measured value changes significantly, maintenance personnel can investigate the machine to determine whether the change is associated with operating conditions or a developing mechanical problem.
A dedicated protection system may also use measurement signals to trigger alarms or shutdown actions when its configured conditions are met. These functions depend on the monitoring and protection equipment, system configuration, and plant procedures—not on the sensor alone.
Reliable performance therefore depends on the complete system, including probe selection, installation, cable integrity, converter compatibility, calibration, and monitoring-channel configuration.
5. Industrial Applications
5.1 Steam Turbines
Steam turbines operate at high speeds and require careful monitoring of rotor behavior. Shaft displacement and vibration measurements can help operators identify changes that may be associated with imbalance, bearing problems, misalignment, or thermal effects.
A compatible PR6424 measurement system can provide shaft-related information for machinery monitoring and protection applications.
5.2 Gas Turbines
Gas turbines are exposed to demanding mechanical and thermal conditions. Monitoring shaft movement can help maintenance personnel evaluate operating trends and investigate abnormal measurements.
The suitability of the PR6424/007-121 for a specific turbine installation depends on its exact configuration, environmental requirements, and compatibility with the installed measuring electronics.
5.3 Hydro Turbines and Generators
Hydroelectric power equipment may experience changing loads and operating conditions. Shaft displacement monitoring can provide information about the mechanical behavior of rotating assemblies.
Non-contact measurement is useful where continuous shaft monitoring is required without direct mechanical contact between the probe and the rotating component.
5.4 Industrial Compressors
Compressors are used in refining, chemical processing, gas transportation, and other continuous-process industries. A compressor failure can interrupt production and increase maintenance costs.
Shaft displacement and vibration information can support condition monitoring when interpreted together with bearing temperature, operating speed, process pressure, and other relevant measurements.
5.5 Pumps and Fans
Large pumps and industrial fans may run continuously in demanding environments. Changes in shaft movement can indicate that further investigation is needed, although the cause must be established through appropriate diagnostics.
A properly installed eddy current probe can provide a non-contact measurement point for suitable rotating equipment.
5.6 Oil and Gas Facilities
Oil and gas facilities depend on rotating equipment for pumping, compression, power generation, and process support. Continuous monitoring helps maintenance teams identify changing operating trends and plan inspections.
A PR6424-family sensor can be considered for suitable machinery monitoring arrangements, provided that the particular probe configuration meets the installation and system requirements.
5.7 Industrial Power Plants
Power plants use turbines, generators, pumps, and auxiliary rotating equipment that may require continuous measurement of shaft behavior.
When integrated into a compatible monitoring system, eddy current measurement data can support operating assessments, maintenance planning, and machinery protection strategies.
6. Installation and System Integration
Correct installation is essential for reliable measurements. Before fitting the PR6424/007-121, review the applicable product documentation, machine drawings, cable requirements, and monitoring-system configuration.
6.1 Verify the Complete Model Number
Check the full model designation on the existing sensor and compare it with the replacement. Variants within the same product family may differ in cable length, mounting dimensions, connector type, or other configuration details.
The complete suffix should be retained in purchasing records and technical documentation. Do not assume that a probe with a similar model number is an exact replacement.
6.2 Confirm Mechanical Dimensions
Verify the sensor body dimensions, mounting thread, insertion length, and available clearance. The stated 16 mm sensor head diameter does not define the complete probe dimensions.
The probe must be mounted securely and positioned so that it does not contact the rotating shaft under expected operating conditions.
6.3 Verify the Target Material
Eddy current measurement depends on the electrical and magnetic properties of the target material. Confirm that the shaft material and surface condition are appropriate for the sensor and its calibration.
Where the measurement chain has been calibrated for a particular target material, a different material may affect the measurement response.
6.4 Check the Cable and Connector
Inspect the cable arrangement, connector, cable length, and physical condition. Confirm that the connection matches the required converter and system configuration.
Route the cable according to the installation requirements. Avoid excessive tension, sharp bends, and locations where the cable may be exposed to avoidable mechanical damage or electrical interference.
6.5 Confirm Signal Converter Compatibility
The sensor must be connected to compatible signal-conditioning equipment. Confirm the converter model and relevant electrical specifications before installation.
Do not assume that the probe can be connected directly to a standard PLC analog input. The correct interface depends on the sensor configuration and the design of the measurement system.
6.6 Set the Initial Probe Gap
Position the sensor according to the prescribed installation procedure. The initial gap must be within the intended measurement range and leave sufficient range for the expected shaft movement.
Incorrect positioning can reduce the available measurement range or cause unreliable readings. Use the specified setup method and appropriate measurement tools.
6.7 Commission the Measurement Channel
After installation, verify the sensor signal and confirm that the monitoring channel responds correctly. Depending on the system, commissioning checks may include the baseline reading, signal scaling, polarity, channel status, and alarm configuration.
Document the results to establish a reference for future maintenance. Changes to machinery protection settings should follow approved site procedures and be performed by qualified personnel.
7. Compatible System Components
The PR6424/007-121 should be evaluated as part of a complete measurement chain. The following table lists the component categories to consider during system design or replacement.
| Component | Function | Verification Requirement |
|---|---|---|
| PR6424/007-121 probe | Detects relative movement between the probe and target | Verify the complete model and physical configuration |
| Cable assembly | Carries the probe signal to the electronics | Check length, construction, and connector type |
| Signal converter | Conditions the probe signal | Confirm compatibility with the exact probe variant |
| Machinery monitoring system | Processes and evaluates measurement signals | 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, clearance, and mechanical stability |
PR6424 measurement systems are associated with compatible Epro/Emerson signal converters, including models in the CON series. However, the exact converter and cable arrangement must be selected using the relevant documentation and the existing system configuration.
A converter that works with one PR6424 probe should not automatically be assumed compatible with every variant.
8. Alternative Models and Replacement Considerations
If the original PR6424/007-121 is unavailable, evaluate a replacement against the complete mechanical and electrical requirements of the installed system.
| Replacement Candidate | Evaluation Approach | Important Consideration |
|---|---|---|
| Epro PR6424/007-121 with matching configuration | Preferred option for like-for-like replacement | Confirm full model number and physical configuration |
| Another Epro PR6424 variant | Potential candidate when the original is unavailable | Verify dimensions, cable, connector, sensitivity, and converter compatibility |
| Compatible probe and converter combination | Consider when the measurement chain is being reviewed | May require configuration checks and recommissioning |
| Alternative manufacturer’s eddy current system | Consider only after a system-level assessment | May require different electronics, mounting, calibration, and protection-system validation |
A different PR6424 suffix should not automatically be treated as a direct replacement. Even where the sensor head diameter is the same, the overall length, cable arrangement, connection type, or electrical characteristics may differ.
Before purchasing a replacement, compare:
- Complete 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 the probe and a conductive target without physical contact during normal operation. This makes it suitable for continuous shaft monitoring.
Support for Shaft Displacement Monitoring
When installed in an appropriate arrangement, the sensor can provide measurement information about relative shaft movement and position.
Use in Rotating Machinery Applications
The PR6424 family is designed for applications involving turbines, compressors, pumps, fans, and other rotating equipment where shaft behavior is an important monitoring parameter.
Integration with Monitoring Systems
The sensor can function as a field-level measurement component within a system containing a compatible converter and machinery monitoring equipment.
Support for Maintenance Planning
Consistent measurements can help maintenance teams establish baselines, track changes over time, and decide when additional inspection may be required.
Defined Sensor Head Size
The stated 16 mm sensor head diameter provides a useful reference for installation planning. However, the complete probe dimensions and mounting details must still be verified before installation.
10. Technical FAQs
Q1. What is the Epro PR6424/007-121?
The Epro PR6424/007-121 is identified as a 16 mm eddy current sensor used in non-contact measurement arrangements for industrial 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 PR6424/007-121?
The supplied specification lists the weight as 0.2 kg. Buyers should confirm whether the figure includes the cable and connector when calculating shipping or installation requirements.
Q4. What can an eddy current sensor measure?
Depending on the installation and associated electronics, an eddy current sensor can measure relative distance to 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 probe detects changes in electromagnetic coupling between its sensing tip and the conductive target.
Q6. Can the PR6424/007-121 connect directly to a PLC?
Direct connection should not be assumed. A compatible signal converter or designated interface is normally required. The correct connection depends on the specific probe configuration and measurement-system design.
Q7. Which machines can use this type of sensor?
Typical applications include steam turbines, gas turbines, hydro turbines, compressors, pumps, fans, and generators. Final suitability depends on the machine, installation conditions, target material, and monitoring equipment.
Q8. Can another PR6424 model replace the PR6424/007-121?
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 check before ordering?
Confirm the full model number, sensor head diameter, probe dimensions, cable arrangement, connector type, product condition, and compatibility with the existing system.
Q10. Why is the complete suffix important?
The suffix forms part of the product identification and may distinguish different configurations. Two sensors from the same family may not be mechanically or electrically interchangeable.
11. Procurement and Replacement Considerations
When sourcing the Epro PR6424/007-121, 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 cable length, connector type, mounting thread, insertion length, and compatibility with the 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, verify that the replacement is acceptable for the existing measurement and protection arrangement. Any required calibration, functional testing, and recommissioning should follow the facility’s approved procedures.
A listing that only identifies a product as a “16 mm Eddy Current Sensor” does not establish full compatibility. Confirming the complete model number and system requirements helps reduce the risk of ordering an unsuitable replacement.
12. Conclusion
The Epro PR6424/007-121 16 mm Eddy Current Sensor is a non-contact sensing component intended for industrial rotating machinery measurement applications. The supplied product information identifies a 16 mm sensor head diameter and a listed weight of 0.2 kg.
When used 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, converter, and monitoring system.
For maintenance teams and industrial buyers, verifying the complete model number and associated connection details is essential when sourcing a replacement. Careful compatibility checks can reduce installation risks and support reliable machinery monitoring in power generation, oil and gas, petrochemical processing, and other industrial applications.