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- PR6426/000-101
- 32 mm Eddy Current Sensor
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- 0.8 kg
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Product Overview
The Epro PR6426/000-101 is a 32 mm eddy current sensor used for non-contact shaft displacement measurement in critical rotating machinery. Applications include steam and gas turbines, hydro turbines, industrial compressors, pumps, and fans, where changes in shaft position can provide useful information about rotor behavior and machine condition.
Consider a turbine operating through repeated load changes. Thermal expansion, thrust-bearing movement, and changes in rotor dynamics can affect the shaft’s position relative to the bearing housing. Installed at a suitable measurement point, the PR6426 sensor detects changes in the gap between its sensing face and the conductive shaft surface. A compatible converter processes the sensor response so the monitoring system can display displacement and record operating trends.
The 32 mm sensing head belongs to the PR6426 family, which supports a static measuring range of ±4.0 mm under its standard configuration. This range is suited to larger-shaft applications where monitoring must capture changes in shaft position as well as dynamic movement. The measurement result depends on the target material, initial air gap, probe mounting, and the configuration of the connected electronics.
The sensor is one element of a complete displacement-measurement chain. It must be paired with compatible signal-conversion equipment or a supported monitoring interface. The probe version and connection arrangement should be checked against the existing system before replacement, especially where a machine uses a dedicated cable and converter combination.
During maintenance, shaft-displacement data can help engineers identify changes that develop gradually or appear after a machine operating condition changes. Comparing the sensor trend with vibration readings, bearing temperatures, and load data helps put an unusual measurement into context instead of treating a single reading as a confirmed mechanical fault.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6426/000-101 |
| 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 measuring chain |
| Compatible Conversion Equipment | Confirm compatibility with the specific sensor connection and converter configuration |
| Typical Applications | Turbines, compressors, pumps, and fans |
| Weight | 0.8 kg |
Product Features
- Non-contact displacement measurement: Detects shaft movement 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 monitoring capability: Supports measurement of shaft movement within the bandwidth of the configured system.
- Converter-based signal processing: Works with compatible electronics to turn probe response into usable displacement data.
- Industrial construction: Uses a stainless-steel sleeve and PTFE cable in the specified sensor assembly.
- Condition monitoring integration: Supplies measurement data for machinery monitoring and protection applications.
- Trend-based diagnostics: Helps maintenance teams compare shaft-position changes over time.
Working Principle
The PR6426/000-101 uses the eddy current principle to measure the gap between its sensing face and a conductive target. The sensor generates an electromagnetic field that interacts with the metal shaft, inducing eddy currents in the target. As the distance changes, the electrical response of the sensing circuit changes accordingly.
A compatible converter processes the response and generates an output corresponding to the measured displacement. In a typical installation, the measurement path is:
Rotating Shaft → PR6426/000-101 Sensor → Compatible Signal Converter → Machinery Monitoring System
When the shaft moves toward the probe, the gap decreases; when it moves away, the gap increases. Within the configured linear region, the change in gap produces a corresponding change in the measurement signal. The monitoring system can use this signal to display shaft position, record trends, and evaluate readings against configured operating limits.
The PR6426 family’s standard static range is ±4.0 mm, with nominal sensitivity of 2 V/mm for the specified reference target. The exact output behavior depends on the converter and selected measurement mode, so the probe and electronics must be treated as a matched system rather than as independent components.
Target material affects the sensor response. The standard reference material is 42CrMo4 ferromagnetic steel. If the actual shaft has different electrical or magnetic properties, the relationship between gap and output may change. Material compatibility should therefore be considered when commissioning the measurement channel.
Initial-gap adjustment is equally important. The probe must be positioned so the expected shaft movement remains within the usable measurement range. A poorly set gap can reduce available travel in one direction or cause the system to operate outside its intended linear region.
The sensor supplies measurement data; alarm and shutdown decisions are handled by the connected monitoring or protection system. These functions depend on the receiving equipment and its configured thresholds and logic.
Role in a Machinery Condition Monitoring System
The PR6426/000-101 forms the sensing point in a shaft-displacement measurement channel. It detects the changing distance between the probe and the rotating shaft, while the converter and monitoring system translate that response into information used to assess machinery condition.
Rotating Shaft → PR6426/000-101 → Signal Converter → Monitoring Channel → Alarm or Protection Logic
| System Element | Function |
|---|---|
| PR6426/000-101 Sensor | Detects changes in the gap between the sensing face and the conductive shaft |
| Compatible Signal Converter | Processes the probe response into 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 probe position and initial air gap |
| Sensor Cable | Carries the sensor signal to the converter |
| Plant Control System | Uses available monitoring data for operational supervision |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Tracking shaft displacement during startup, loading, and normal operation |
| Gas Turbines | Monitoring rotor position as part of machinery condition assessment |
| Hydro Turbines | Measuring shaft movement in turbine-generator assemblies |
| Industrial Compressors | Observing rotor displacement and changes in operating behavior |
| Large Pumps | Monitoring shaft position in critical pumping equipment |
| Industrial Fans | Tracking shaft movement in rotating equipment requiring continuous supervision |
| Power Generation Plants | Feeding shaft-displacement measurements into turbine monitoring systems |
| Petrochemical Facilities | Monitoring critical rotating equipment under demanding process conditions |
| Machinery Protection Systems | Supplying displacement data to compatible monitoring channels |
| Predictive Maintenance Programs | Comparing shaft-position trends with vibration and operating data |
Installation and Maintenance
- Verify the full order code: Confirm that the installed sensor is PR6426/000-101 and that its connection arrangement matches the existing measurement system.
- 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 for the selected measurement range and converter configuration.
- Confirm target compatibility: Check that the shaft material is suitable for the measuring-chain calibration, particularly if it differs from the standard 42CrMo4 reference material.
- Maintain required clearance: Observe the specified clearance around the probe to reduce interference from nearby ferrous structures.
- Match the converter: Verify the sensor connection, converter type, and measuring-range configuration before commissioning.
- Inspect the cable assembly: Look for damaged insulation, abrasion, loose connectors, or signs of excessive heat exposure.
- Protect cable routing: Keep the cable clear of sharp edges, excessive bending, moving components, and sources of electrical interference.
- Validate the output: Check that the measured value corresponds to the expected initial gap and configured converter output.
- Investigate unexpected changes: Examine the probe position, shaft target, cable connections, and converter status if the signal shifts or becomes unstable.
- Apply machinery safety procedures: Isolate equipment and follow the required site procedures before working near rotating machinery.
- Document the baseline: Record the model, initial gap, target material, converter configuration, and initial readings for future comparison.
Compatible System Components
| Component | Function |
|---|---|
| Compatible PR6426 Signal Converter | Processes the probe response for displacement measurement |
| CON 011 Converter | Supports compatible sensor arrangements using the specified connector interface |
| CON 021 Converter | Supports compatible eddy current measurement configurations |
| CON 031 Converter | Provides signal conversion for supported sensor connection arrangements |
| CON 041 Converter | Supports compatible sensor configurations according to the selected measuring range |
| Supported MMS 3000 Series Equipment | Integrates compatible sensor measurements into machinery monitoring |
| Sensor Mounting Assembly | Holds the probe in the required position relative to the shaft |
| 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 processed measurement data where supported |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Epro PR6426/000-100 | 32 mm Eddy Current Sensor | Compare the complete order code and connection arrangement before considering it as an alternative |
| Epro PR6426/000-040 | 32 mm Eddy Current Sensor | Check the specified configuration and converter compatibility before substitution |
| Epro PR6426/000-041 | 32 mm Eddy Current Sensor | Verify the complete version code and installation requirements against the existing setup |
| Epro PR6425 Series | Eddy Current Sensor | Consider when a different probe geometry or measuring range is more appropriate |
| Epro PR6424 Series | Eddy Current Sensor | Evaluate where the application calls for a different sensor diameter and displacement range |
Key Advantages
- Measures shaft displacement without contacting the rotating surface.
- Supports a standard static measuring range of ±4.0 mm.
- Supplies measurement data to compatible machinery monitoring systems.
- Supports continuous observation of shaft position in critical rotating equipment.
- Helps maintenance teams assess displacement trends alongside other operating data.
Technical FAQs
What should be checked before replacing a PR6426/000-101 sensor?
Confirm the complete order code, cable and connector arrangement, target material, and compatibility with the installed converter. Sharing the PR6426 family designation alone does not guarantee that two versions can be exchanged without checking the configuration.
Is the sensor suitable for both axial and radial shaft displacement?
The PR6426 family can be used to measure axial or radial shaft displacement, depending on the mounting position. The installation location and monitoring channel must correspond to the movement being monitored.
How does the initial air gap affect the measurement?
The initial gap establishes the sensor’s operating point within its measuring range. Incorrect positioning can reduce the available travel in one direction or move the system outside its intended linear region, affecting the interpretation of shaft movement.
Can the sensor identify a mechanical fault by itself?
No. It measures changes in the distance to the conductive target. Fault assessment depends on the monitoring system and on comparing displacement trends with other information, such as vibration, bearing temperature, and machine operating conditions.