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- PR6426/000-041
- 32 mm Eddy Current Sensor
- Germany
- 32 mm
- 0.8 kg
- Xiamen, China
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Product Overview
The Epro PR6426/000-041 is a 32 mm eddy current sensor for non-contact measurement of shaft displacement in critical rotating machinery. It belongs to the PR6426 sensor family, which is used in applications such as steam turbines, gas turbines, hydro turbines, industrial compressors, pumps, and fans. The sensor monitors the distance between its sensing face and a conductive metal target, allowing shaft movement to be measured without physical contact.
In a turbine bearing assembly, the rotor may shift axially as operating conditions change, while radial movement can develop from bearing wear, imbalance, or changes in mechanical loading. A sensor installed at the appropriate measurement point detects changes in the gap between its sensing face and the shaft. Its output can then be processed by compatible monitoring equipment to track shaft position, eccentricity, and dynamic movement.
The 32 mm sensing head is intended for applications involving larger shafts and a relatively wide displacement range. The PR6426 family supports a standard static measuring range of ±4.0 mm, making it suitable for monitoring applications where smaller-range probes may not provide sufficient measurement travel. Actual performance depends on the target material, initial air gap, sensor installation, and compatible signal-conversion equipment.
The PR6426/000-041 functions as part of a measurement chain rather than as a standalone protection device. The sensor must be matched with suitable conversion equipment or a compatible machinery monitoring interface. This arrangement allows the measured displacement to be evaluated alongside vibration, bearing temperature, and other operating data.
When a shaft-position trend changes unexpectedly, the sensor can help maintenance personnel determine whether the movement is associated with the machine’s mechanical condition. The mounting position, target surface, cable connections, and converter configuration should also be checked before the reading is treated as evidence of a developing mechanical fault.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6426/000-041 |
| Product Family | PR6426 |
| Product Type | 32 mm Eddy Current Sensor |
| Measuring Principle | Non-contact eddy current |
| Sensor Head Diameter | 32 mm |
| Static Measuring Range | ±4.0 mm |
| Sensitivity | 2 V/mm (50.8 mV/mil), maximum deviation ±1.5% |
| Nominal Center Air Gap | Approximately 5.5 mm |
| Long-Term Drift | Less than 0.3% |
| Standard Reference Target Material | Ferromagnetic steel, 42CrMo4 |
| Operating Temperature | -35 to +175°C |
| Short-Term Temperature Excursion | Up to +200°C for less than 4 hours |
| Maximum Cable Temperature | +200°C |
| Sensor Sleeve Material | Stainless steel |
| Cable Material | PTFE |
| Frequency Range | Up to 20 kHz (-3 dB), depending on the measuring chain |
| Compatible Conversion Equipment | CON 011, CON 021, CON 031, CON 041, or supported MMS 3000 series configurations |
| Typical Applications | Turbines, compressors, pumps, and fans |
| Weight | 0.8 kg |
Product Features
- Non-contact shaft measurement: Detects changes in shaft position without touching the rotating surface.
- 32 mm sensing head: Suited to measurement arrangements for larger rotating shafts.
- Wide static measuring range: Supports displacement measurement up to ±4.0 mm under the standard configuration.
- Dynamic measurement capability: Supports monitoring of shaft movement within the bandwidth of the configured measuring chain.
- Converter-based integration: Works with compatible conversion equipment to generate usable displacement signals.
- Industrial temperature tolerance: Accommodates demanding machinery environments within the specified operating limits.
- Industrial-grade construction: Uses a stainless-steel sleeve and PTFE cable.
- Condition monitoring support: Supplies displacement data for ongoing assessment of critical rotating machinery.
Working Principle
The PR6426/000-041 operates using the eddy current principle. The sensor generates a high-frequency electromagnetic field that interacts with a conductive metal target, such as a rotating shaft. This interaction induces eddy currents in the target and changes the electrical response of the sensor circuit according to the distance between the sensing face and the metal surface.
A compatible converter processes this response and produces an output corresponding to the measured gap. The measurement path can be represented as follows:
Rotating Shaft → PR6426/000-041 Sensor → Signal Converter → Machinery Monitoring System
When the shaft moves closer to the sensor, the gap decreases; when it moves away, the gap increases. Within the specified linear measuring region, the change in gap produces a corresponding change in the measurement output. The monitoring system can use this signal to display shaft displacement, record operating trends, and compare readings against configured limits.
The PR6426 family has a standard static measuring range of ±4.0 mm and a nominal sensitivity of 2 V/mm for the specified reference target. If the application requires an extended range, the converter configuration must be selected accordingly. The sensitivity and output characteristics should be verified for the actual measuring chain rather than assumed to remain unchanged across different configurations.
The material of the shaft also affects measurement performance. The standard reference material is 42CrMo4 ferromagnetic steel. When the actual target uses a different conductive material, its electrical and magnetic properties may change the sensor response. The measuring chain may therefore require adjustment for the target material.
Initial-gap adjustment is another critical step. The sensor must be positioned within the intended operating range, with enough measurement travel available for the expected shaft movement in both directions. Incorrect positioning can reduce the usable linear range or result in inaccurate readings.
The sensor provides displacement information, but alarm and shutdown decisions belong to the connected monitoring or protection system. Those functions depend on the receiving equipment, configured thresholds, and the overall machinery protection arrangement.
Role in a Machinery Condition Monitoring System
The PR6426/000-041 serves as the sensing element in a shaft-displacement monitoring channel. It detects changes in the gap between the probe and the shaft, while the associated converter and monitoring equipment process the signal for operational assessment.
Rotating Shaft → PR6426/000-041 → Signal Converter → Monitoring Channel → Alarm or Protection Logic
| System Element | Function |
|---|---|
| PR6426/000-041 Sensor | Detects changes in the distance between the sensing face and the shaft |
| Compatible Signal Converter | Processes the sensor response into a usable measurement output |
| Machinery Monitoring System | Displays, records, and evaluates shaft-displacement data |
| Protection System | Applies configured alarm or trip logic where supported |
| Shaft or Rotor | Provides the conductive target surface |
| Sensor Mounting Assembly | Maintains the required sensor position and initial air gap |
| Sensor Cable | Carries the sensor signal to the converter |
| Plant Control System | Uses available monitoring information for operational supervision |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Monitoring axial and radial shaft movement under changing operating loads |
| Gas Turbines | Tracking rotor displacement as part of machinery condition monitoring |
| Hydro Turbines | Measuring shaft movement in turbine-generator assemblies |
| Industrial Compressors | Monitoring rotor position and identifying changes in mechanical behavior |
| Large Pumps | Measuring shaft displacement in critical pumping equipment |
| Industrial Fans | Tracking shaft movement in rotating equipment requiring continuous monitoring |
| Power Generation Plants | Supplying displacement measurements to turbine monitoring channels |
| Petrochemical Facilities | Monitoring critical rotating equipment operating under demanding process conditions |
| Machinery Protection Systems | Providing shaft-displacement signals to compatible monitoring channels |
| Predictive Maintenance Programs | Tracking changes in rotor position to support maintenance planning |
Installation and Maintenance
- Verify the complete model number: Confirm that the sensor is PR6426/000-041 and that the selected measuring configuration suits the intended application.
- Check the mounting arrangement: Secure the sensor and align its sensing face with the specified shaft measurement point.
- Set the initial air gap: Follow the applicable installation procedure to establish the correct starting position for the selected measuring range.
- Confirm target-material compatibility: Check that the shaft material matches the measuring-chain calibration or that an appropriate adjustment has been made.
- Maintain installation clearance: Observe the specified clearance around the probe to minimize interference from nearby ferrous structures.
- Verify converter compatibility: Confirm that the converter supports the sensor and the required measuring range and output configuration.
- Inspect the cable assembly: Examine the cable, connector, and protective covering for abrasion, loose connections, or heat-related damage.
- Secure cable routing: Protect the cable from sharp edges, excessive bending, mechanical movement, and electrical interference.
- Check the measurement output: Verify that the signal corresponds to the expected initial gap and converter configuration before enabling the monitoring channel.
- Investigate abnormal readings: Check probe alignment, target condition, cable connections, converter status, and operating conditions if the measurement changes unexpectedly.
- Follow machinery safety procedures: Apply the required isolation and protection measures before accessing the sensor near rotating equipment.
- Record commissioning data: Document the sensor model, target material, initial gap, converter configuration, and baseline readings for future trend analysis.
Compatible System Components
| Component | Function |
|---|---|
| Compatible PR6426 Signal Converter | Processes the probe signal for displacement measurement |
| CON 011 Converter | Supports compatible sensor arrangements with the specified connector interface |
| CON 021 Converter | Supports compatible sensor configurations and measuring chains |
| CON 031 Converter | Provides signal conversion for supported sensor arrangements |
| CON 041 Converter | Supports compatible eddy current sensor configurations |
| MMS 3000 Series Monitoring Equipment | Processes supported sensor measurements for machinery monitoring |
| Sensor Mounting Assembly | Maintains the required probe position and alignment |
| Compatible Sensor Cable | Carries the measurement signal to the converter |
| Conductive Shaft Target | Provides the surface from which displacement is measured |
| Plant Monitoring Interface | Receives and displays the processed measurement signal where supported |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Epro PR6426/000-040 | 32 mm Eddy Current Sensor | Compare the complete order code and required measurement configuration before considering replacement |
| Epro PR6426/000-031 | 32 mm Eddy Current Sensor | Related PR6426 variant; verify the exact configuration and installation requirements |
| Epro PR6425 Series | Eddy Current Sensor | Consider when a different probe configuration and measuring range suit the application |
| Epro PR6424 Series | Eddy Current Sensor | Evaluate for installations requiring a different sensor diameter or displacement range |
| Epro PR6423 Series | Eddy Current Sensor | Consider where its specified measuring range meets the required monitoring task |
Key Advantages
- Measures shaft displacement without contact with the rotating surface.
- Supports a standard static measuring range of ±4.0 mm.
- Supplies measurement data to compatible machinery monitoring systems.
- Supports continuous assessment of shaft movement in critical rotating equipment.
- Allows displacement trends to be reviewed alongside other machine-condition data.
Technical FAQs
What does the 32 mm specification indicate on the PR6426/000-041?
It refers to the sensor head diameter. The mounting arrangement and surrounding clearance should be checked to ensure the probe can be installed in the intended measurement position without interference from nearby metal structures.
Which types of shaft movement can this sensor measure?
Depending on its mounting position, the PR6426 family can measure axial or radial shaft displacement and eccentricity. The selected measurement direction and monitoring channel must match the machine’s monitoring requirements.
Does the PR6426/000-041 need a signal converter?
The sensor is normally used with compatible conversion equipment or a supported monitoring interface. The selected converter must match the sensor, measuring range, and required output characteristics.
What can cause an incorrect shaft-displacement reading?
Potential causes include an incorrect initial air gap, incompatible target material, loose cable connections, incorrect converter configuration, or interference from nearby metal. Check the complete measuring chain before concluding that the reading represents actual shaft movement.