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- PR6424/015-101
- 16 mm Eddy Current Sensor
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Product Overview
The Epro PR6424/015-101 16 mm Eddy Current Sensor is a non-contact displacement measurement device designed for monitoring the condition and operating behavior of rotating machinery. It belongs to the EPRO PR6424 series, which is used in machinery protection and condition monitoring applications involving turbines, compressors, pumps, fans, and other critical industrial equipment.
The sensor uses eddy current technology to measure the distance between its sensing tip and a conductive target, typically a ferromagnetic steel shaft. As the shaft moves relative to the sensor, the measured gap changes. The resulting electrical signal can be processed by a compatible monitoring system to determine shaft vibration, displacement, axial position, eccentricity, and other operating characteristics.
Unlike contact-based measurement devices, an eddy current sensor does not need to touch the rotating shaft. This makes it suitable for continuous monitoring in machinery where reliable measurement and minimal mechanical interference are important.
The PR6424 series features a 16 mm sensing head and is designed for applications involving relatively large rotating shafts. Its measurement performance supports both static position monitoring and dynamic shaft-displacement measurement. When combined with a compatible signal converter and machinery protection monitor, it can provide information used for equipment condition assessment and protective control.
The PR6424/015-101 is intended for industrial monitoring installations where accurate shaft measurement is required. Before replacement or system integration, users should verify the complete model designation, cable configuration, connector type, sensor characteristics, and compatibility with the installed monitoring equipment.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Epro |
| Manufacturer | Emerson |
| Model | PR6424/015-101 |
| Product Type | Eddy Current Displacement Sensor |
| Sensor Series | PR6424 |
| Sensor Technology | Eddy Current |
| Sensor Head Diameter | 16 mm |
| Measurement Method | Non-contact displacement measurement |
| Typical Sensitivity | 4 V/mm |
| Typical Linearity | ≤ ±1.5% |
| Static Measurement Range | ±2.0 mm |
| Dynamic Measurement Range | 0 to 1,000 μm |
| Nominal Center Air Gap | Approximately 2.7 mm |
| Target Material | Ferromagnetic steel |
| Recommended Shaft Diameter | ≥ 80 mm |
| Sensor Thread | M18 × 1.5 |
| Sensor Sleeve Material | Stainless steel |
| Cable Material | PTFE |
| Typical Operating Temperature | Depends on the applicable sensor specification and configuration |
| Weight Provided | 0.2 kg |
| Application | Shaft vibration, displacement, position, and eccentricity monitoring |
Note: The technical performance values above describe the PR6424 16 mm sensor family. Confirm the exact operating-temperature limits, cable assembly, connector, and suffix-specific characteristics for the PR6424/015-101 before installation.
Function and Working Principle
The Epro PR6424/015-101 operates through the principle of electromagnetic induction. It generates an alternating electromagnetic field at the sensing tip and detects changes in the field caused by the movement of a conductive target.
When the sensor is installed near a rotating shaft, the distance between the probe tip and the shaft surface determines the electrical response. Changes in this distance are converted into an output signal that can be interpreted by compatible monitoring equipment.
1. Eddy Current Measurement
The sensor produces an electromagnetic field near its sensing surface. When a conductive metal target enters this field, eddy currents are generated within the target material.
These currents influence the electromagnetic field and change the sensor’s electrical characteristics. The associated signal variation corresponds to the distance between the sensor and the target.
This measurement principle allows the PR6424 to detect small changes in shaft position without physical contact.
2. Shaft Displacement Measurement
The sensor can measure changes in the gap between the probe and the shaft surface. When a shaft moves radially or axially, the distance changes and the sensor produces a corresponding output variation.
In machinery monitoring applications, this information can be used to evaluate shaft displacement and identify abnormal mechanical movement.
3. Vibration Monitoring
A rotating shaft may experience vibration caused by imbalance, misalignment, bearing deterioration, looseness, or other mechanical conditions.
By continuously measuring shaft movement, the PR6424 can provide a signal to a compatible machinery monitoring system. The system can process the signal to evaluate vibration amplitude and trends over time.
This information supports condition-based maintenance and helps maintenance teams investigate developing mechanical problems.
4. Position and Eccentricity Measurement
The PR6424 series can also be used for static shaft-position and eccentricity measurements.
Eccentricity refers to the deviation of a rotating shaft from its expected geometric center. Monitoring this condition can help engineers identify mechanical irregularities during startup, shutdown, or normal operation.
The sensor’s static measurement capability is particularly useful when a monitoring system needs to distinguish shaft position from dynamic vibration.
Role in Industrial Machinery Monitoring Systems
The PR6424/015-101 is normally used as part of a complete machinery monitoring arrangement rather than as an independent protection device.
A typical installation includes the sensor, an appropriate extension or connection cable where required, a compatible signal converter, and a machinery monitoring instrument.
Sensor Installation
The sensor is mounted in a suitable position near the rotating shaft. Its sensing tip must maintain the specified measurement gap and be aligned with the intended measurement surface.
Correct mechanical installation is essential because mounting errors, unsuitable target materials, or incorrect air-gap settings can affect measurement accuracy.
Signal Conversion
The sensor signal is processed by a compatible converter or signal-conditioning unit. The converter provides the required measurement output for the monitoring system.
The complete sensor and converter combination must be matched according to the manufacturer’s specifications. Electrical compatibility should not be assumed simply because two components belong to the same product family.
Machinery Protection Monitoring
A compatible machinery protection system can receive the processed signal and compare measured values with configured alarm and trip limits.
Depending on the monitoring architecture, the system may provide:
- Shaft vibration measurement.
- Radial displacement monitoring.
- Axial position monitoring.
- Shaft eccentricity measurement.
- Speed-related measurement signals.
- Alarm and trip outputs.
- Historical measurement data for maintenance analysis.
The PR6424 itself measures displacement. Alarm decisions and machinery shutdown functions are handled by the associated monitoring and protection equipment.
Industrial Applications
The Epro PR6424/015-101 is suitable for applications where non-contact shaft measurement is required for rotating machinery.
1. Steam Turbines
Steam turbines operate under demanding mechanical and thermal conditions. Continuous shaft monitoring helps operators observe rotor movement and identify changes that may indicate mechanical problems.
Eddy current sensors can be installed at appropriate measurement locations to monitor shaft vibration and displacement. The resulting data can support turbine condition assessment and machinery protection.
2. Gas Turbines
Gas turbines require reliable monitoring because rotor-related mechanical problems can affect equipment availability and operating safety.
A compatible PR6424 monitoring arrangement can measure shaft movement and provide information for machinery condition monitoring.
3. Industrial Compressors
Large compressors are widely used in petrochemical plants, refineries, natural gas facilities, and industrial processing systems.
Shaft vibration and displacement monitoring can help maintenance teams identify changes in rotor behavior. Continuous measurement supports trend analysis and helps detect abnormal conditions before they develop into more serious equipment problems.
4. Industrial Pumps
Critical process pumps often operate continuously and may be exposed to changing hydraulic loads, temperature variations, and demanding operating conditions.
Non-contact shaft measurement can help monitor mechanical movement and support the evaluation of pump condition.
5. Industrial Fans and Blowers
Large fans and blowers are used in ventilation, combustion-air systems, cooling systems, and industrial exhaust applications.
Shaft vibration monitoring can provide useful information about rotor balance, bearing condition, and mechanical stability.
6. Generators and Rotating Machinery
Generators and other large rotating machines require stable shaft operation. Displacement sensors can provide measurement signals used to monitor rotor movement and support equipment maintenance.
The actual suitability of the PR6424/015-101 depends on the machine’s shaft material, diameter, installation arrangement, measurement range, and monitoring-system requirements.
Installation and System Integration
Correct installation is essential for achieving reliable measurement performance.
1. Verify the Sensor Model
Before installation, confirm that the sensor is identified as PR6424/015-101. Check the complete model designation, serial information, cable assembly, and connector configuration.
Different PR6424 variants may have different cable or connection arrangements. A sensor that looks similar may not be an interchangeable replacement.
2. Confirm the Target Material
The PR6424 series is designed to measure conductive targets, with ferromagnetic steel specified as the standard target material.
The shaft material and surface condition should be checked against the sensor’s calibration requirements. Using an unsuitable target material may affect measurement accuracy.
3. Set the Correct Measurement Gap
The sensor must be installed with the appropriate air gap between its sensing tip and the shaft surface.
The PR6424 series specification identifies a nominal center air gap of approximately 2.7 mm. The final installation gap should follow the applicable manufacturer’s calibration and installation procedure.
An incorrect gap may reduce the usable measurement range or result in inaccurate readings.
4. Maintain Proper Mechanical Alignment
The sensor should be securely mounted and aligned with the intended measurement surface. The mounting thread and locking arrangements must be suitable for the machine installation.
Avoid excessive mechanical stress on the sensor body and cable. Ensure that the probe is not exposed to unintended contact with the rotating shaft.
5. Protect the Sensor Cable
The sensor cable should be routed away from excessive heat, sharp edges, moving machinery, and sources of electrical interference.
Observe the specified minimum bending radius and avoid twisting or pulling the cable during installation. Cable damage can cause unstable signals or complete loss of measurement.
6. Check Converter Compatibility
The sensor must be paired with a compatible EPRO signal converter or monitoring-system input.
Verify the supported sensor type, electrical characteristics, cable configuration, and calibration requirements. Do not assume that every converter designed for an EPRO sensor will support every PR6424 variant.
7. Test the Measurement Signal
After installation, verify the sensor output and confirm that the monitoring system displays a stable measurement under the specified operating conditions.
Check the air gap, cable connections, signal quality, and alarm configuration before placing the equipment into normal operation.
Compatible System Components
The PR6424/015-101 is generally integrated into a machinery condition monitoring system. The following component categories may be involved in a complete installation.
| Component | Function | Integration Considerations |
|---|---|---|
| PR6424 signal converter | Converts the sensor signal into a usable monitoring output | Must support the exact sensor type and electrical configuration |
| Extension cable | Connects the sensor assembly to compatible monitoring equipment | Verify cable length, connector, shielding, and electrical characteristics |
| Machinery protection monitor | Processes vibration and displacement measurements | Confirm supported sensor inputs and configuration |
| PLC or DCS | Receives relevant process or monitoring information | Integration depends on available outputs and system architecture |
| Machinery monitoring rack | Houses monitoring and protection modules | Verify module compatibility and channel configuration |
| Shaft measurement target | Provides the conductive surface measured by the probe | Target material and geometry must meet sensor requirements |
| Mounting bracket or probe holder | Secures the sensor in its measurement position | Confirm thread, dimensions, and mechanical stability |
| Industrial control cabinet | Protects monitoring electronics and wiring | Provide suitable environmental protection and cable routing |
The components listed above are system elements, not necessarily accessories supplied with the sensor.
Alternative Models and Replacement Considerations
The PR6424 family includes different sensor configurations. Replacement selection should be based on the complete model designation rather than the 16 mm sensing-head diameter alone.
| Model or Product Family | Description | Replacement Considerations |
|---|---|---|
| Epro PR6424 series | 16 mm eddy current sensor family | Confirm the complete suffix, cable, and converter compatibility |
| Epro PR6425 series | Eddy current sensor family for different temperature requirements | Check sensing range, temperature capability, and system compatibility |
| Epro PR6423 series | 8 mm eddy current sensor family | Different sensing diameter and measurement characteristics; not a direct substitute |
| Bently Nevada 3300 XL series | Eddy current proximity measurement system | Requires a full review of probe, cable, and monitor compatibility |
| Other industrial displacement sensors | Alternative non-contact measurement technologies | Compare measurement range, target material, accuracy, and output requirements |
Before selecting a replacement, verify:
- Complete sensor model and suffix.
- Sensing head diameter.
- Thread size and mounting dimensions.
- Cable length and connector type.
- Sensor and converter compatibility.
- Measurement range and sensitivity.
- Target material and shaft diameter.
- Operating temperature and environmental requirements.
- Monitoring-system input specifications.
A replacement probe with the same nominal diameter may still have different electrical characteristics or cable arrangements.
Key Advantages
Non-Contact Measurement
The PR6424 measures shaft movement without touching the rotating target. This reduces mechanical interference and makes it suitable for continuous monitoring.
High Measurement Sensitivity
The PR6424 series has a typical sensitivity of 4 V/mm, supporting measurement of small changes in the distance between the sensor and the target.
Static and Dynamic Measurement
The sensor family supports both static shaft-position measurement and dynamic displacement monitoring, allowing it to serve multiple machinery monitoring requirements.
Industrial Rotating Machinery Applications
The sensor is designed for critical equipment such as turbines, compressors, pumps, and fans.
Compact 16 mm Sensing Head
The 16 mm sensing head supports installation in suitable machinery measurement locations where a larger probe may not be practical.
Integration with Machinery Protection Systems
When paired with a compatible converter and monitoring system, the sensor can provide measurement signals for condition monitoring and machinery protection functions.
Durable Industrial Construction
The PR6424 series uses a stainless-steel sensor sleeve and PTFE cable construction, as specified in the product-family documentation.
Technical FAQs
1. What is the Epro PR6424/015-101?
The Epro PR6424/015-101 is a 16 mm eddy current sensor designed for non-contact measurement of shaft displacement and vibration in rotating machinery.
2. What is the sensor head diameter?
The sensor head diameter is 16 mm.
3. What is the measurement principle?
It uses eddy current technology. The sensor generates an electromagnetic field, and changes caused by a conductive target affect the electrical response. This response is used to determine the distance between the sensor and the target.
4. What is the typical sensitivity of the PR6424 series?
The typical sensitivity is 4 V/mm, equivalent to approximately 101.6 mV/mil.
5. What is the measurement range?
The PR6424 family specification gives a static measurement range of ±2.0 mm and a dynamic measurement range of 0 to 1,000 μm.
6. What material should the sensor measure?
The standard target material is ferromagnetic steel. The actual shaft material should be checked against the sensor’s calibration requirements.
7. Where is the PR6424/015-101 commonly used?
It is suitable for monitoring applications involving steam turbines, gas turbines, compressors, pumps, fans, and other rotating machinery.
8. Does the sensor require a signal converter?
A compatible converter or signal-conditioning device is normally required to process the sensor signal for a machinery monitoring system. The exact converter must be selected according to the sensor configuration.
9. What should be checked before replacing the sensor?
Confirm the complete model number, sensor diameter, mounting thread, cable configuration, connector, measurement range, and converter compatibility.
10. What is the weight of the PR6424/015-101?
The supplied product weight is 0.2 kg. This is consistent with the PR6424 series specification of approximately 200 g for the sensor and 1 m cable without armor.
Procurement and Maintenance Recommendations
When purchasing the Epro PR6424/015-101, verify the complete model designation and inspect the sensor body, sensing tip, cable, connector, and identification label.
For replacement projects, compare the existing sensor with the proposed unit. Pay particular attention to the cable length, connector arrangement, mounting dimensions, and compatibility with the installed converter.
For used or refurbished sensors, request clear photographs and available testing information. Check for damaged cable insulation, bent or contaminated connectors, damaged threads, and visible wear around the sensing tip.
During maintenance, inspect the mounting position and cable routing. Ensure that the sensor remains securely installed and that its measurement gap is within the specified range.
If the monitoring system reports unstable measurements, check the cable connections, target surface, mounting alignment, air gap, and converter configuration before replacing the sensor.
Maintaining accurate records of sensor model numbers, installation locations, cable arrangements, and calibration information can simplify future troubleshooting and spare-parts procurement.
Conclusion
The Epro PR6424/015-101 16 mm Eddy Current Sensor is designed for non-contact shaft displacement and vibration measurement in critical rotating machinery. Its PR6424 series technology supports static position measurement and dynamic displacement monitoring, making it suitable for applications involving turbines, compressors, pumps, fans, and generators.
With a 16 mm sensing head, typical sensitivity of 4 V/mm, and a static measurement range of ±2.0 mm, the PR6424 series provides measurement capabilities for industrial machinery condition monitoring.
For maintenance and replacement applications, confirming the complete model suffix, cable configuration, target material, mounting requirements, and signal-converter compatibility is essential for reliable system operation.