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- PR6426/000-140
- 32 mm Eddy Current Sensor
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- 32 mm
- 0.8 kg
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Product Overview
The Epro PR6426/000-140 is a 32 mm eddy current sensor used for non-contact displacement measurement in rotating machinery. It belongs to the PR6426 sensor family, which is intended for monitoring shaft position, eccentricity, and movement in large rotating equipment.
Unlike contact-based measuring devices, the PR6426 detects changes in the distance between its sensing head and a conductive metal target. This makes it suitable for machinery where continuous contact with the rotating shaft would be impractical. Typical applications include turbines, compressors, pumps, and fans, where shaft displacement measurements help engineers assess operating conditions and identify developing mechanical problems.
The PR6426 has a nominal static measuring range of ±4.0 mm and a sensitivity of 2 V/mm when used with the appropriate signal-conditioning equipment. Its 32 mm sensing head is intended for applications involving large shafts, with the measuring target and installation clearance selected according to the sensor’s requirements.
When selecting the PR6426/000-140 for an existing monitoring system, engineers should verify the complete model designation, cable and connector arrangement, signal converter compatibility, and required measuring range.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6426/000-140 |
| Product Type | Eddy Current Sensor |
| Sensor Head Diameter | 32 mm |
| Measurement Principle | Non-contact eddy current |
| Static Measuring Range | ±4.0 mm |
| Sensitivity | 2 V/mm |
| Nominal Air Gap | Approximately 5.5 mm |
| Operating Temperature | -35 to +180°C |
| Sensor Head Pressure Resistance | 6,500 hPa |
| Sensor and 1 m Cable Weight, Without Armor | Approximately 0.8 kg |
Product Features
- Non-contact displacement measurement: Measures the distance between the sensor head and a conductive target without requiring physical contact.
- 32 mm sensing head: Supports the PR6426 family’s applications involving large rotating shafts.
- Wide static measuring range: Provides a nominal measurement range of ±4.0 mm for suitable shaft-position monitoring applications.
- Defined measurement sensitivity: Offers a nominal sensitivity of 2 V/mm when paired with compatible signal-conditioning equipment.
- Industrial temperature capability: Supports operation in demanding machinery environments within its specified temperature limits.
- Continuous machinery monitoring: Can be integrated into a compatible monitoring chain for observing shaft displacement and related mechanical behavior.
Working Principle
The PR6426 uses the eddy current principle to measure the distance between its sensing head and an electrically conductive target. The sensor and its compatible signal converter form a measuring chain in which the electrical response changes as the target moves relative to the sensor.
When the sensor approaches or moves away from a conductive shaft surface, the resulting change in the sensor’s electrical characteristics is processed by the signal converter. The converter produces an output corresponding to the measured displacement within the configured measurement range.
The basic signal path is:
Conductive Shaft Surface → PR6426 Eddy Current Sensor → Compatible Signal Converter → Monitoring System
For shaft-position measurements, the initial gap between the sensor and the target must be adjusted according to the converter’s requirements. Correct adjustment is essential because an incorrect initial gap can affect the usable measurement range and the interpretation of the output signal.
The PR6426 is intended for use with suitable ferromagnetic steel targets and compatible signal-conditioning equipment. Sensor installation, target material, clearance, and converter configuration must therefore be considered together rather than treating the sensor as an independent measuring device.
Role in the Machinery Monitoring Architecture
The PR6426 serves as the displacement-sensing element in a machinery monitoring chain. It detects changes in the position of a conductive target and supplies the corresponding signal to a compatible converter or monitoring input.
| System Element | Function |
|---|---|
| Epro PR6426/000-140 | Detects non-contact displacement relative to the conductive target |
| Rotating Shaft | Provides the target surface for measurement |
| Signal Converter | Conditions the sensor signal and produces a usable measurement output |
| Monitoring System | Processes the displacement signal for machinery-condition assessment |
| Installation Mounting | Maintains the required sensor alignment and initial gap |
| Signal Cabling | Connects the sensor to the compatible signal-conditioning equipment |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Monitoring shaft displacement and position |
| Gas Turbines | Measuring shaft movement in compatible machinery monitoring systems |
| Hydro Turbines | Supporting non-contact shaft-position measurements |
| Industrial Compressors | Monitoring displacement in rotating compressor assemblies |
| Pumps | Measuring shaft movement as part of machinery condition monitoring |
| Industrial Fans | Observing shaft-position changes in large rotating equipment |
| Predictive Maintenance | Supplying displacement data for machinery-condition assessment |
Installation and Maintenance
- Verify the model designation: Confirm PR6426/000-140 and check the complete identification before installation or replacement.
- Check converter compatibility: Ensure that the connected signal converter supports the PR6426 sensor and the required measurement configuration.
- Confirm target material: Verify that the measured surface is compatible with the sensor’s specified target-material requirements.
- Prepare the mounting surface: Ensure that the mounting arrangement is secure and suitable for the required sensor alignment.
- Set the initial gap: Adjust the distance between the sensor head and the target according to the compatible converter’s installation instructions.
- Maintain installation clearance: Follow the specified clearance requirements around the sensor and target to avoid interference with the measurement.
- Inspect the sensor head: Check the sensing surface and surrounding components for mechanical damage or contamination.
- Check cable condition: Inspect the sensor cable for abrasion, crushing, damaged insulation, or excessive bending.
- Verify connector compatibility: Confirm that the sensor connection matches the signal converter or interface used by the monitoring system.
- Check signal response: Verify the output using the approved commissioning procedure and confirm that the signal changes appropriately with target movement.
- Review measurement behavior: Compare the measured output with the expected shaft position and investigate abnormal readings before returning the machinery to service.
- Document installation details: Record the sensor model, converter configuration, initial gap, inspection findings, and commissioning results.
Compatible System Components
| Component | Function |
|---|---|
| Compatible PR6426 Signal Converter | Conditions the sensor signal for measurement and monitoring |
| CON011 / CON021 Converter | Supports compatible sensor connections using the specified connector arrangement |
| CON031 / CON041 Converter | Supports compatible sensor connections using the specified terminal arrangement |
| Compatible MMS 3000 Monitoring Modules | Provides an integrated monitoring-system interface where supported |
| Conductive Shaft Target | Provides the surface measured by the sensor |
| Sensor Mounting Hardware | Maintains the required position and alignment |
| Signal Cabling | Carries the sensor signal to the corresponding interface |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Epro PR6426/000-100 | 32 mm Eddy Current Sensor | Verify the complete variant and cable configuration before substitution |
| Epro PR6426/010-100 | 32 mm Eddy Current Sensor | Compare the connection arrangement and installed cable configuration |
| Epro PR6425/010-100 | Eddy Current Sensor | Different sensor-head design and measurement characteristics; verify application requirements |
| Epro PR6424/010-100 | Eddy Current Sensor | Smaller sensing head and different measurement range; not an automatic replacement |
Key Advantages
- Non-contact measurement of shaft displacement.
- Nominal static measuring range of ±4.0 mm.
- 2 V/mm nominal sensitivity with compatible signal conditioning.
- Suitable for large rotating machinery monitoring applications.
- Integration with compatible signal converters and machinery monitoring systems.
Technical FAQs
What type of displacement can the PR6426/000-140 measure?
The PR6426 family supports non-contact measurement of shaft position and displacement. Depending on the installation and monitoring arrangement, it can also be used to assess eccentricity and shaft movement.
Why must the initial air gap be adjusted carefully?
The initial air gap determines the operating point within the measuring range. An incorrect gap can reduce the usable range or produce an output that does not accurately represent the intended shaft position.
Can the PR6426/000-140 connect directly to any monitoring module?
No. The sensor must be paired with a compatible signal converter or an approved integrated monitoring interface. The connector arrangement and electrical characteristics must match the receiving equipment.
What should be checked if the sensor output is unstable?
Inspect the sensor mounting, initial gap, cable and connectors, target surface, and converter configuration. Also check for mechanical vibration or interference that could affect the measurement before concluding that the sensor itself is faulty.