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- PR6424/013-140
- 16 mm Eddy Current Sensor
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- 0.2 kg
- Xiamen, China
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Product Overview
The Epro PR6424/013-140 16 mm Eddy Current Sensor is a non-contact displacement measurement probe designed for monitoring the condition and operating behavior of rotating machinery. It belongs to the PR6424 sensor family, developed for applications that require reliable measurement of shaft vibration, displacement, position, eccentricity, and rotational movement.
Manufactured under the EPRO product line associated with Emerson, the PR6424 series is commonly used in machinery protection and condition-monitoring systems. Its non-contact measurement principle allows the sensor to monitor a rotating shaft without requiring physical contact with the target surface. This makes it suitable for critical equipment where continuous monitoring of shaft movement is important.
The PR6424/013-140 has a nominal sensor head diameter of 16 mm. It is intended for installation near a suitable conductive shaft surface, where changes in the distance between the probe and the target influence the sensor’s electrical characteristics. When connected to a compatible signal converter, these changes can be processed into measurement signals for monitoring equipment.
The sensor family is designed for demanding rotating machinery applications, including steam turbines, gas turbines, hydro turbines, compressors, pumps, and industrial fans. It can form part of a machinery protection system that provides information about shaft vibration and displacement to monitoring equipment or a plant control system.
For industrial maintenance teams, the complete model number is important when selecting a replacement. Different PR6424 configurations may have different cable lengths, connector arrangements, probe lengths, mounting threads, and converter compatibility. These details should be checked against the installed sensor before ordering.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Epro |
| Product Line | EPRO / Emerson |
| Model | PR6424/013-140 |
| Product Series | PR6424 |
| Product Type | Eddy Current Displacement Sensor |
| Measurement Principle | Non-contact eddy current |
| Sensor Head Diameter | 16 mm |
| Static Measurement Range | ±2.0 mm |
| Dynamic Measurement Range | 0 to 1,000 μm |
| Typical Sensitivity | 4 V/mm |
| Typical Linearity | ≤ ±1.5% |
| Nominal Center Air Gap | Approximately 2.7 mm |
| Target Material | Ferromagnetic steel |
| Reference Shaft Diameter | ≥80 mm |
| Probe Sleeve Material | Stainless steel |
| Cable Material | PTFE |
| Typical Operating Temperature | Refer to the exact probe configuration and applicable datasheet |
| Sensor Head Pressure Resistance | 10,000 hPa (145 psi), series specification |
| Shock and Vibration Reference | 5 g at 60 Hz and 25°C |
| Weight Provided | 0.2 kg |
| Typical Applications | Turbines, compressors, pumps, fans, and rotating machinery |
Note: The values above combine the supplied product information with general PR6424 series specifications. Exact cable length, connector type, probe body dimensions, thread configuration, and temperature limits should be verified for the complete PR6424/013-140 ordering code.
Function and Working Principle
The PR6424/013-140 uses eddy current technology to measure the distance between the sensor tip and a conductive target. Unlike contact-based measuring devices, the probe does not need to touch the rotating shaft during normal operation.
1. Non-Contact Eddy Current Measurement
The sensor contains an electrical coil near its sensing tip. When supplied with the appropriate excitation signal from a compatible converter, the coil produces an electromagnetic field.
When a conductive target, such as a ferromagnetic steel shaft, enters this field, eddy currents are generated in the target surface. These currents affect the electrical characteristics of the probe coil.
Changes in the distance between the sensor and the target therefore produce measurable changes in the probe signal. A compatible signal converter processes these changes and generates an output that can be interpreted by monitoring equipment.
This principle allows the sensor to monitor shaft movement without direct mechanical contact.
2. Shaft Displacement Measurement
Shaft displacement describes the movement of a rotating shaft relative to a reference position. Excessive displacement may indicate mechanical problems such as bearing wear, shaft misalignment, looseness, or changes in operating conditions.
The PR6424 series provides a static measurement range of approximately ±2.0 mm. This allows the monitoring system to detect changes in the probe-to-target gap within the specified measurement range.
The actual usable range depends on the target material, sensor installation, converter configuration, and calibration.
3. Vibration Monitoring
Rotating machinery naturally produces some vibration during operation. However, changes in vibration amplitude or frequency may indicate developing mechanical problems.
The PR6424 sensor can measure dynamic shaft movement within the specified operating range. When connected to an appropriate monitoring system, its signal can be used to evaluate shaft vibration and identify abnormal operating patterns.
This information can help maintenance personnel investigate bearing problems, imbalance, misalignment, and other mechanical conditions.
4. Position and Eccentricity Measurement
The sensor can also be used to monitor shaft position and eccentricity. Eccentricity describes the variation in the distance between the shaft surface and a fixed reference point as the shaft rotates.
Changes in eccentricity may be associated with shaft deformation, mechanical runout, thermal effects, or installation problems.
Continuous measurement provides useful information for machinery condition assessment, particularly during startup, shutdown, and changing operating conditions.
5. Signal Conversion
The PR6424 probe is part of a measurement system rather than a complete standalone monitoring instrument. A compatible signal converter is required to supply the probe and process its measurement signal.
The converter translates changes in the probe’s electrical characteristics into an output suitable for a machinery monitoring system. The converter model, cable arrangement, and probe configuration must be matched correctly.
Role in Industrial Machinery Protection Systems
The PR6424/013-140 can serve as a sensing element within an industrial machinery protection and condition-monitoring system.
Turbine Monitoring
Steam and gas turbines operate at high rotational speeds and are exposed to changing thermal and mechanical conditions. Shaft vibration and displacement measurements are important for evaluating their mechanical behavior.
A properly installed PR6424 probe can provide shaft movement information to a compatible monitoring system. Engineers can use this information to assess operating conditions and investigate abnormal vibration trends.
Compressor Protection
Industrial compressors are used in chemical processing, oil and gas facilities, power plants, and manufacturing operations. Mechanical problems can affect compressor performance and equipment availability.
Eddy current sensors can monitor shaft movement and provide measurement signals for machinery condition monitoring. Multiple measurement points may be used to evaluate the behavior of different shafts or bearing locations.
Pump Monitoring
Large industrial pumps may operate continuously in demanding environments. Shaft vibration and displacement measurements can help maintenance teams identify developing mechanical issues.
The PR6424 series can be used in suitable pump-monitoring arrangements where its measurement range and installation configuration match the equipment requirements.
PLC and DCS Integration
A compatible signal converter or machinery monitoring module can provide measurement outputs to a plant control architecture.
Depending on the system design, shaft vibration and displacement information may be made available to a PLC, DCS, or dedicated machinery protection system. These systems can display operating values, generate alarms, and support maintenance decisions.
The probe itself should not be treated as a direct PLC input device without the required signal-conditioning and monitoring hardware.
Industrial Applications
1. Steam Turbines
Steam turbines are used in power generation and industrial process facilities. Continuous monitoring of shaft movement is important because mechanical changes can affect turbine reliability and operating stability.
The PR6424 sensor family is designed for critical turbomachinery applications and can be incorporated into suitable turbine shaft-monitoring systems.
2. Gas Turbines
Gas turbines operate under high-speed and high-temperature conditions. Shaft vibration and displacement monitoring can provide information about rotor behavior and mechanical condition.
A correctly installed eddy current probe can contribute to a broader machinery protection arrangement.
3. Hydro Turbines
Hydro turbines are used in hydroelectric power generation. Their rotating assemblies require monitoring to identify changes in shaft position and vibration.
The PR6424 family can be used in suitable hydro-turbine monitoring installations where the probe’s mechanical and electrical configuration is appropriate.
4. Industrial Compressors
Compressors are essential in many continuous-process industries. Their rotating shafts and bearings must operate within defined mechanical limits.
Non-contact displacement sensors can provide continuous shaft movement measurements, helping operators identify abnormal vibration trends and investigate potential equipment problems.
5. Large Industrial Pumps
Pumps used in power plants, water treatment facilities, and process industries may require continuous condition monitoring. Shaft displacement measurements can help identify changes in bearing and rotor behavior.
The sensor can be integrated into an appropriate monitoring arrangement when its measurement range and installation requirements match the pump design.
6. Industrial Fans
Large industrial fans and ventilation equipment may operate continuously in production facilities. Shaft vibration monitoring can help detect mechanical imbalance, bearing deterioration, and alignment problems.
The PR6424 sensor may be considered for suitable fan-monitoring applications, subject to the shaft size and installation requirements.
Installation and System Integration
Correct installation is essential for measurement accuracy and long-term reliability.
1. Verify the Sensor Configuration
Before installation, confirm the complete PR6424/013-140 model number. Check the probe length, mounting thread, cable length, connector arrangement, and compatibility with the intended signal converter.
A sensor with the same 16 mm head diameter may still have a different mechanical or electrical configuration.
2. Select the Correct Mounting Position
The probe should be installed so that its sensing tip faces the intended shaft measurement surface. The mounting position must provide sufficient mechanical clearance and maintain the required sensor-to-target gap.
The PR6424 series uses a nominal center air gap of approximately 2.7 mm. The actual installation gap should be established using the applicable manufacturer’s installation instructions and converter setup.
3. Check the Target Surface
The measurement target should meet the material and surface requirements of the sensor system. The PR6424 series specifications reference ferromagnetic steel, with 42CrMo4 used as a standard target material.
Surface condition, shaft diameter, runout, and target geometry can influence measurement performance. The recommended shaft diameter for the PR6424 series is generally 80 mm or larger.
4. Route and Protect the Cable
The sensor cable should be routed away from sources of electrical interference and excessive mechanical stress. Avoid sharp bends, crushing, abrasion, and unnecessary tension.
The PR6424 series uses PTFE cable insulation. The permitted temperature and mechanical conditions depend on the exact cable and probe configuration.
5. Connect the Compatible Signal Converter
The sensor must be paired with a compatible converter. Verify the required probe-converter combination, cable arrangement, and connector interface before energizing the system.
An incorrect converter or cable configuration may result in inaccurate measurements or failure to obtain a valid output signal.
6. Calibrate and Commission
After installation, establish the correct sensor gap and verify the measurement output using the approved commissioning procedure.
Check the static position signal, dynamic response, and overall measurement stability. Confirm that the monitoring system displays reasonable values and that alarm settings match the machinery protection requirements.
Record the installation details and calibration information for future maintenance.
Compatible System Components
A complete eddy current measurement system generally includes the probe, extension cable where required, signal converter, and monitoring equipment.
| Component | Function | Compatibility Considerations |
|---|---|---|
| PR6424 sensor probe | Detects shaft displacement and vibration | Verify the exact model and mechanical configuration |
| Extension cable | Connects the probe to the converter | Cable type and length must match the measurement system |
| Signal converter | Supplies and processes the probe signal | Confirm compatibility with the exact PR6424 configuration |
| Machinery monitoring module | Receives and evaluates measurement signals | Check input type, measurement range, and channel configuration |
| PLC | Coordinates machine operation and process logic | Requires a suitable signal interface or monitoring-system output |
| DCS | Displays plant operating conditions and alarms | Integration depends on the available monitoring-system interface |
| Machinery protection system | Evaluates vibration and displacement conditions | Confirm channel setup and protection requirements |
| Industrial control cabinet | Houses monitoring and signal-processing equipment | Provide suitable environmental and electrical protection |
The components listed above are typical elements of a measurement installation. They are not necessarily supplied with the sensor.
Alternative Models and Replacement Considerations
The PR6424 series includes different probe configurations. Although several models share the same nominal 16 mm sensor head diameter, their cable and mounting arrangements may differ.
| Alternative Model or Component | Description | Replacement Considerations |
|---|---|---|
| PR6424/000 series | PR6424 16 mm sensor configurations | Verify probe length, cable, thread, and connector |
| PR6424/005 series | Alternative 16 mm probe configurations | Confirm the full ordering code and installation details |
| PR6424/006 series | Additional PR6424 sensor configurations | Check cable arrangement and converter compatibility |
| PR6424/007 series | Alternative sensor configurations | Confirm measurement and mounting requirements |
| PR6424/010 series | PR6424 probe variants | Verify cable length, connector, and converter pairing |
| PR6424/014 series | Additional PR6424 configurations | Do not assume interchangeability based on diameter alone |
| PR6425 series | Related eddy current sensor family | Different sensor characteristics and application limits may apply |
Before replacing a PR6424/013-140, check the following:
- Complete model number and suffix.
- Sensor head diameter and probe body length.
- Mounting thread and installation arrangement.
- Cable length, cable type, and connector.
- Compatible signal converter.
- Measurement range and sensitivity.
- Target material and shaft diameter.
- Operating temperature and environmental conditions.
- Monitoring-system input and calibration requirements.
A replacement probe should be approved against the original measurement-system design. A similar-looking sensor may not provide equivalent electrical or mechanical performance.
Key Advantages
Non-Contact Measurement
The eddy current principle allows shaft displacement and vibration to be measured without physical contact between the probe and the rotating target.
Continuous Machinery Monitoring
The sensor can provide measurement information continuously when installed with a compatible converter and monitoring system.
16 mm Sensor Head
The 16 mm sensing head is designed for applications that require a larger probe diameter and a suitable mounting arrangement.
High Measurement Sensitivity
The PR6424 family specifies a typical sensitivity of 4 V/mm with linearity of approximately ±1.5%, supporting precise displacement measurement within its specified operating range.
Static and Dynamic Measurement
The sensor family supports both shaft position measurement and dynamic movement monitoring, allowing it to contribute to vibration and machinery protection systems.
Industrial Rotating Machinery Applications
The PR6424 series is designed for critical machinery such as turbines, compressors, pumps, and fans.
Integration with Monitoring Systems
When paired with the appropriate converter and monitoring equipment, the sensor can provide measurement information for plant-level condition monitoring and equipment protection.
Technical FAQs
1. What is the Epro PR6424/013-140?
The PR6424/013-140 is a 16 mm eddy current sensor used for non-contact measurement of shaft displacement and vibration in rotating machinery.
2. What is the sensor head diameter?
The specified sensor head diameter is 16 mm.
3. What is the working principle of the PR6424 sensor?
It uses eddy current technology. An electromagnetic field generated by the probe interacts with a conductive target. Changes in the distance between the probe and target affect the probe signal, which is processed by a compatible converter.
4. What can this sensor measure?
The PR6424 family is designed for measuring radial and axial shaft dynamic displacement, position, eccentricity, and speed-related parameters in suitable measurement systems.
5. What is the typical sensitivity?
The PR6424 series specifies a typical sensitivity of 4 V/mm, with linearity of approximately ±1.5%.
6. What is the static measurement range?
The series specification gives a static measurement range of approximately ±2.0 mm. Actual system performance depends on the probe, converter, target, and calibration.
7. Does the sensor require a signal converter?
Yes. The probe is used with a compatible signal converter that supplies the sensor and processes its measurement signal. It should not be assumed to provide a direct standard PLC signal by itself.
8. What equipment can use this sensor?
Typical applications include steam turbines, gas turbines, hydro turbines, compressors, pumps, and industrial fans.
9. What is the supplied weight?
The supplied product weight is 0.2 kg. The final shipping weight may differ depending on packaging and included accessories.
10. Can another PR6424 model replace the PR6424/013-140?
Not automatically. Confirm the complete model number, probe length, thread, cable, connector, and converter compatibility before selecting a replacement.
Procurement and Maintenance Recommendations
When purchasing the Epro PR6424/013-140, verify the complete model number and the physical configuration of the sensor. The 16 mm head diameter alone is not sufficient to establish interchangeability.
Ask the supplier to confirm the cable length, connector type, mounting thread, probe length, and compatibility with the existing signal converter. For critical machinery, it is also advisable to check the sensor’s condition and request available test or calibration information.
During maintenance, inspect the probe body, sensing tip, cable insulation, connector, and mounting hardware. Look for signs of mechanical damage, contamination, corrosion, or cable deterioration.
If the sensor is replaced, follow the correct installation and calibration procedure. Incorrect probe gaps, unsuitable target surfaces, or incompatible converter arrangements may produce inaccurate readings and unreliable machinery protection.
Keep records of the installed model, mounting position, converter configuration, calibration results, and measurement trends. This information can help maintenance teams identify changes in machinery behavior and plan future replacement work.
Conclusion
The Epro PR6424/013-140 16 mm Eddy Current Sensor is a non-contact displacement measurement probe designed for rotating machinery condition monitoring. Its 16 mm sensing head and PR6424 series measurement characteristics make it suitable for appropriately configured turbine, compressor, pump, and fan monitoring systems.
With a compatible signal converter and machinery monitoring platform, the sensor can provide useful information about shaft displacement, vibration, position, and eccentricity. For replacement and maintenance projects, verifying the complete ordering code, cable arrangement, mounting configuration, and converter compatibility is essential to maintaining reliable measurement performance.