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- PR6426/000-040
- 32 mm Eddy Current Sensor
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- 0.8 kg
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Product Overview
The Epro PR6426/000-040 is an eddy current sensor used for non-contact displacement measurement in large rotating machinery. It belongs to the PR6426 32 mm sensor family, which is intended for monitoring shaft position, eccentricity, and movement in critical turbomachinery. Typical applications include steam turbines, gas turbines, hydro turbines, industrial compressors, pumps, and fans.
In a turbine bearing assembly, the rotor may shift axially as operating conditions change, while radial movement can develop as a result of bearing wear, rotor 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 conductive shaft surface. The resulting signal helps maintenance personnel track shaft movement during operation without placing a contacting element against the rotating component.
The PR6426 family’s 32 mm sensing head and extended static displacement range make it suitable for large-shaft applications where substantial position changes need to be measured. The standard static range is ±4.0 mm, with the available measuring range depending on the associated signal converter and configuration. The sensor’s performance also depends on the target material, mounting position, initial air gap, and condition of the complete measurement chain.
The sensor is one part of a larger measurement system. It works with compatible signal-conversion equipment or a supported machinery monitoring interface that processes its response into usable displacement data. The converter configuration must match the required range and output characteristics before the signal is connected to a monitoring or protection channel.
For maintenance teams, this measurement is particularly useful when investigating changes in rotor position over time. Comparing displacement trends with vibration readings, bearing temperatures, and machine operating conditions can help determine whether an abnormal reading reflects a mechanical change or a problem with the sensor installation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6426/000-040 |
| 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 |
| Dynamic Frequency Range | Up to 20 kHz (-3 dB), depending on the measurement chain |
| Compatible Conversion Equipment | EZ1000, CON 011, CON 031, CON 041, or supported AMS 3000 series configurations |
| Typical Applications | Turbines, compressors, pumps, and fans |
| Weight | 0.8 kg |
Product Features
- Non-contact shaft measurement: Detects displacement without physical contact with the rotating shaft.
- 32 mm sensing head: Supports measurement applications involving large rotating shafts.
- Extended static range: Measures displacement within the specified ±4.0 mm range under the standard configuration.
- Dynamic response: Supports monitoring of shaft movement within the bandwidth of the configured measurement chain.
- Converter-based signal processing: Works with compatible conversion equipment to produce usable displacement data.
- High-temperature capability: Accommodates demanding machinery environments within its specified temperature limits.
- Industrial sensor construction: Uses a stainless-steel sleeve and PTFE cable.
- Continuous condition monitoring: Supplies measurement data for evaluating changes in shaft position over time.
Working Principle
The PR6426/000-040 measures the distance between its sensing face and a conductive metal target using the eddy current principle. An electromagnetic field generated by the sensor interacts with the shaft surface, inducing eddy currents in the target. Changes in the gap alter the electrical response of the sensor circuit.
A compatible signal converter processes this response and generates an output corresponding to the measured displacement. The basic measurement path is:
Rotating Shaft → PR6426/000-040 Sensor → Signal Converter → Machinery Monitoring System
When a turbine rotor moves toward the sensor, the gap decreases; when it moves away, the gap increases. Within the specified linear measuring region, these changes produce corresponding variations in the measurement signal. The monitoring system can display the displacement, record operating trends, and compare readings with configured alarm thresholds.
The standard PR6426 measuring configuration has a static range of ±4.0 mm and a nominal sensitivity of 2 V/mm for the specified reference target. If the application requires a wider range, an appropriate converter configuration may be necessary. The resulting sensitivity and output characteristics must be checked before the measurement channel is commissioned.
Target material is another consideration. The reference material is ferromagnetic steel, specifically 42CrMo4. Different shaft materials can affect the sensor response, so the actual target surface must be compatible with the selected measuring-chain calibration.
The initial air gap determines the sensor’s operating point within the measurement range. Incorrect adjustment may leave insufficient travel in one direction or cause the sensor to operate outside the intended linear region. The probe should therefore be installed according to the applicable configuration and commissioning procedure.
The sensor measures displacement but does not independently decide whether a machine should alarm or shut down. Those decisions are handled by the connected monitoring or protection system using its configured thresholds and logic.
Role in a Machinery Condition Monitoring System
The PR6426/000-040 serves as the measurement point between the rotating shaft and the electronic monitoring system. It detects changes in the sensor-to-shaft gap, while compatible conversion equipment processes the response for use in condition monitoring.
Rotating Shaft → PR6426/000-040 → Signal Converter → Monitoring Channel → Alarm or Protection Logic
| System Element | Function |
|---|---|
| PR6426/000-040 Sensor | Detects changes in the distance between the sensing face and the conductive shaft |
| Compatible Signal Converter | Processes the sensor response and generates the configured 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 probe position and initial air gap |
| Sensor Cable | Carries the measurement signal to the converter |
| Plant Control System | Uses available monitoring data for operational supervision |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Monitoring axial and radial shaft displacement as operating loads change |
| Gas Turbines | Tracking rotor movement as part of machinery condition monitoring |
| Hydro Turbines | Measuring shaft displacement in turbine-generator assemblies |
| Industrial Compressors | Monitoring rotor position and identifying changes in mechanical behavior |
| Large Pumps | Measuring shaft movement in critical pumping equipment |
| Industrial Fans | Tracking displacement in rotating equipment requiring continuous supervision |
| Power Generation Plants | Supplying shaft-position data to turbine monitoring systems |
| Petrochemical Facilities | Monitoring critical rotating machinery under demanding process conditions |
| Machinery Protection Systems | Providing displacement signals to compatible monitoring channels |
| Predictive Maintenance Programs | Tracking changes in shaft position to support condition assessment and maintenance planning |
Installation and Maintenance
- Verify the model number: Confirm that the sensor is PR6426/000-040 and that the selected measuring configuration matches the application.
- Check the mounting position: Secure the sensor assembly and align the sensing face with the intended shaft measurement point.
- Set the initial air gap: Follow the applicable installation procedure to establish the correct starting gap for the selected range and converter.
- Confirm target compatibility: Check that the shaft material is compatible with the sensor calibration and reference characteristics.
- Maintain installation clearance: Observe the specified clearance around the probe to reduce interference from nearby ferrous structures.
- Verify converter compatibility: Ensure that the converter supports the sensor and the required measurement range and output configuration.
- Inspect the cable assembly: Examine the cable, connectors, 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 sources of electrical interference.
- Check the measurement output: Confirm that the output 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 machine operating conditions if the signal changes unexpectedly.
- Follow machinery safety procedures: Apply the required isolation and protection measures before working near rotating equipment.
- Record commissioning data: Document the sensor model, target material, initial gap, converter configuration, and baseline reading for future trend analysis.
Compatible System Components
| Component | Function |
|---|---|
| Compatible PR6426 Signal Converter | Processes the probe signal for displacement measurement |
| EZ1000 Converter | Supports compatible PR6426 measurement configurations |
| CON 011 Converter | Provides signal conversion for supported sensor arrangements |
| CON 031 Converter | Supports compatible eddy current sensor configurations |
| CON 041 Converter | Supports specified standard or extended measuring-range configurations |
| Supported AMS 3000 Series Module | Integrates compatible sensor measurements into machinery monitoring equipment |
| Machinery Monitoring System | Displays and evaluates processed displacement data |
| 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 |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Epro PR6426/000-031 | 32 mm Eddy Current Sensor | Compare the full order code and specified configuration before selecting it as an alternative |
| Epro PR6426/000-020 | Eddy Current Sensor | Verify the environmental and mechanical configuration against the installation requirements |
| Epro PR6425 Series | Eddy Current Sensor | Consider when a different probe configuration and measuring range are more suitable |
| Epro PR6424 Series | Eddy Current Sensor | Evaluate for installations requiring a different sensor geometry or measurement range |
| Epro PR6423 Series | Eddy Current Sensor | Consider where its specified measuring range meets the required shaft-monitoring task |
Key Advantages
- Measures shaft displacement without contacting the rotating surface.
- Supports a standard static measuring range of ±4.0 mm.
- Provides measurement data for compatible machinery monitoring systems.
- Supports continuous observation of critical rotating equipment.
- Allows displacement trends to be assessed alongside other machine-condition measurements.
Technical FAQs
What type of machinery is the PR6426/000-040 intended to monitor?
It is intended for critical rotating machinery such as steam turbines, gas turbines, hydro turbines, compressors, pumps, and fans. The sensor measures shaft displacement, with the installation arrangement determining whether axial or radial movement is monitored.
Does the sensor require a separate converter?
The sensor normally operates as part of a measuring chain with compatible signal-conversion equipment or a supported monitoring interface. The selected equipment must match the sensor configuration, measuring range, and required output.
How does the target material affect displacement measurements?
Eddy current response depends on the electrical and magnetic properties of the target. The standard reference material is 42CrMo4 ferromagnetic steel. A different shaft material may change the measurement response and should be evaluated during system selection and commissioning.
What should be investigated when the displacement signal becomes unstable?
Check the sensor mounting, initial air gap, target surface, cable connections, converter configuration, and nearby metal structures. Compare the signal with other machinery measurements before concluding that the shaft itself is moving abnormally.