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- PR6426/000-130
- 32 mm Eddy Current Sensor
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- 0.8 kg
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Product Overview
The Epro PR6426/000-130 is a 32 mm eddy current sensor used for non-contact measurement of shaft displacement in critical rotating machinery. It belongs to the PR6426 family, which is commonly used in steam turbines, gas turbines, hydro turbines, compressors, pumps, and industrial fans. Its purpose is to detect changes in the distance between the sensor head and a conductive metal target, allowing a monitoring system to track shaft position and movement during machine operation.
In a large compressor, for example, changes in rotor position can occur as operating loads vary or bearing conditions change. A probe mounted near the shaft measures the changing gap without touching the rotating surface. The resulting signal can be processed by compatible conversion equipment to monitor axial or radial displacement, depending on the probe’s installation position.
The 32 mm sensing head is intended for larger-shaft measurement applications. The PR6426 family has a standard static measuring range of ±4.0 mm, with a nominal sensitivity of 2 V/mm when used with the specified reference target and correctly matched measuring chain. This makes it suitable for applications where monitoring equipment must capture meaningful changes in shaft position over a relatively wide range.
The PR6426/000-130 is also associated with CON021 converter configurations. The sensor and converter must be matched according to their connection arrangement, calibration, and required output. When replacing an existing probe, the complete order code and the installed measuring-chain configuration should be checked rather than assuming that all 32 mm sensors can be exchanged directly.
For maintenance engineers, the main benefit is access to continuous shaft-position information. A gradual change in displacement may indicate a developing mechanical condition, while an abrupt signal change may require checks of both the machine and the measurement chain. Comparing the sensor output with vibration, bearing temperature, and operating-load data helps establish the context of an unusual reading.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6426/000-130 |
| 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, standard PR6426 configuration |
| Nominal 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 |
| Associated Conversion Equipment | Compatible CON021 configuration, subject to verification of the complete assembly |
| Typical Applications | Turbines, compressors, pumps, and fans |
| Weight | 0.8 kg |
Product Features
- Non-contact measurement: Detects changes in the gap between the probe and a conductive shaft without physical contact.
- 32 mm sensing head: Suited to larger-shaft measurement arrangements that meet the required mounting and target-clearance conditions.
- Wide static measuring range: Supports displacement measurement up to ±4.0 mm under the standard PR6426 configuration.
- Continuous shaft-position tracking: Supplies data for monitoring rotor movement as operating conditions change.
- Converter-based signal processing: Works with compatible electronics to produce a usable displacement signal.
- Industrial construction: The PR6426 family uses a stainless-steel sleeve and PTFE cable.
- Dynamic measurement capability: Supports shaft-motion monitoring within the bandwidth of the complete measuring chain.
- Condition monitoring integration: Can be incorporated into a compatible machinery monitoring or protection arrangement.
Working Principle
The PR6426/000-130 operates through the eddy current principle. Its sensing circuit generates an electromagnetic field that interacts with the conductive metal shaft. This interaction produces eddy currents in the target, changing the sensor’s electrical response according to the distance between the sensing face and the shaft surface.
A compatible converter processes the response into an electrical signal that represents the measured gap. In a typical installation, the measurement path is:
Rotating Shaft → PR6426/000-130 Sensor → Compatible Signal Converter → Machinery Monitoring System
As the shaft moves toward the probe, the gap decreases. When it moves away, the gap increases. Within the configured linear region, the electrical response changes in relation to displacement. The monitoring system can use this signal to display shaft position, record trends, and compare readings with configured operating limits.
The standard PR6426 configuration supports a static measuring range of ±4.0 mm and a nominal sensitivity of 2 V/mm for the specified reference target. The actual measurement output depends on the selected converter and its settings. The sensor and conversion electronics therefore need to be treated as a matched system, especially where a specific output range or extended measuring range is required.
The target material affects the measurement relationship. The standard reference material is 42CrMo4 ferromagnetic steel. If the actual shaft uses a different material, its electrical and magnetic properties may change the response at a given gap. Target compatibility should be established when configuring and commissioning the measuring chain.
The initial air gap is another important factor. The probe must be positioned so that the expected shaft movement remains within the usable measuring region. Incorrect positioning can reduce the available travel in one direction or cause the system to operate outside its intended linear range.
The sensor supplies displacement information; it does not independently make shutdown decisions. Alarm and trip functions depend on the connected monitoring or protection equipment and its configured logic.
Role in a Machinery Condition Monitoring System
The PR6426/000-130 serves as the sensing element in a shaft-displacement measurement channel. It detects changes in the distance between the probe and the shaft, while the associated converter and monitoring equipment process the signal for operational assessment.
Rotating Shaft → PR6426/000-130 → Compatible Signal Converter → Monitoring Channel → Alarm or Protection Logic
| System Element | Function |
|---|---|
| PR6426/000-130 Sensor | Detects changes in the gap between the sensing face and the conductive shaft |
| Compatible Signal Converter | Processes the probe response into the required 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 and Connector | 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 displacement during startup and load changes |
| Gas Turbines | Tracking rotor position as part of continuous machinery condition monitoring |
| Hydro Turbines | Measuring shaft movement in turbine-generator assemblies |
| Industrial Compressors | Observing rotor displacement and changes in mechanical behavior |
| Large Pumps | Monitoring shaft position in critical pumping equipment |
| Industrial Fans | Tracking shaft movement where continuous displacement monitoring is required |
| Power Generation Plants | Feeding shaft-position measurements into turbine monitoring channels |
| Petrochemical Facilities | Monitoring critical rotating machinery under demanding process conditions |
| Machinery Protection Systems | Supplying displacement signals to compatible monitoring channels |
| Predictive Maintenance Programs | Comparing shaft-position trends with vibration and operating data |
Installation and Maintenance
- Verify the complete order code: Confirm that the sensor is PR6426/000-130 and check that the cable and connector arrangement matches the intended measuring system.
- Inspect the mounting location: Ensure the probe can be secured and aligned with the intended shaft measurement point.
- Set the initial air gap: Follow the applicable installation procedure to establish the correct starting position within the selected measuring range.
- Check target-material compatibility: Confirm that the shaft material matches the measuring-chain calibration or that any required adjustment has been accounted for.
- Maintain the required clearance: Observe the specified clearance around the sensing head to minimize interference from nearby ferrous structures.
- Verify converter compatibility: Confirm that the selected CON021 configuration supports the sensor connection and required measurement output.
- Inspect the cable assembly: Check for abrasion, damaged insulation, loose connections, or signs of excessive heat exposure.
- Protect cable routing: Avoid sharp edges, excessive bending, moving components, and sources of electrical interference.
- Validate the output signal: Confirm that the measurement corresponds to the expected initial gap and converter configuration before enabling the monitoring channel.
- Investigate abnormal readings: Check the probe alignment, target surface, cable connections, converter settings, and machine operating conditions if the signal changes unexpectedly.
- Follow machinery safety procedures: Apply the required isolation and site safety 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 comparisons.
Compatible System Components
| Component | Function |
|---|---|
| Epro PR6426/000-130 Sensor | Measures shaft displacement using the eddy current principle |
| Compatible CON021 Signal Converter | Processes the probe response into a configured electrical output |
| Compatible CON011 Converter | Supports applicable sensor configurations when the connector interface and calibration match |
| Compatible CON031 Converter | Supports applicable sensor configurations with the required open-ended cable connection |
| Compatible CON041 Converter | Provides signal conversion for supported sensor configurations |
| Supported MMS 3000 Series Monitoring Equipment | Processes compatible sensor signals for machinery condition monitoring |
| Sensor Mounting Assembly | Maintains the probe position relative to the shaft |
| Compatible Sensor Cable and Connector | Carries the sensor response to the conversion equipment |
| Conductive Shaft Target | Provides the metal surface used for displacement measurement |
| Machinery Monitoring Channel | Displays and records processed displacement data |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Epro PR6426/000-100 | 32 mm Eddy Current Sensor | Compare the complete order code, connection arrangement, and measuring-chain configuration before substitution |
| Epro PR6426/000-101 | 32 mm Eddy Current Sensor | Verify the cable configuration and converter compatibility against the existing installation |
| Epro PR6426/000-110 | 32 mm Eddy Current Sensor | Check the complete version code and measurement interface before considering replacement |
| Epro PR6426/000-111 | 32 mm Eddy Current Sensor | Compare the sensor connection and commissioning requirements with the installed system |
| Epro PR6426/000-121 | 32 mm Eddy Current Sensor | Confirm the exact probe configuration and converter compatibility before selecting as an alternative |
Key Advantages
- Measures shaft displacement without contacting the rotating surface.
- Supports a standard static measuring range of ±4.0 mm.
- Supplies displacement data to compatible machinery monitoring equipment.
- Supports continuous observation of shaft position in critical rotating machinery.
- Helps engineers assess displacement trends alongside vibration and operating conditions.
Technical FAQs
What is the purpose of the PR6426/000-130 in a machinery monitoring system?
It measures the gap between the probe and a conductive shaft surface. Depending on the installation position, the measurement can be used to monitor axial or radial shaft displacement, shaft position, and eccentricity.
Which converter should be used with the PR6426/000-130?
A compatible converter must match the sensor’s connection arrangement, calibration, and required output. CON021 configurations are associated with this sensor model, but the complete assembly and interface should be checked before installation or replacement.
Does the sensor measure vibration as well as shaft position?
The sensor can capture dynamic changes in the shaft-to-probe gap within the bandwidth of the measuring chain. The resulting signal may be used for shaft-motion or vibration-related monitoring, depending on the measurement arrangement and monitoring equipment.
What should be checked if the displacement reading does not match the machine’s operating condition?
Inspect the initial air gap, probe alignment, target surface, cable connections, and converter configuration. Compare the reading with vibration, bearing temperature, and operating-load data before concluding that the sensor or the machine has developed a fault.