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- PR6423/011-100
- 8mm Eddy Current Sensor
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- 0.1 kg
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Product Overview
The Epro PR6423/011-100 8mm Eddy Current Sensor is a non-contact eddy current probe used to monitor the relative movement between a rotating machine shaft and a fixed measurement point. It belongs to the PR6423 Series and is intended for machinery applications where shaft displacement, position, eccentricity, or vibration-related movement needs to be monitored continuously.
The probe works with a compatible signal-conditioning unit rather than functioning as a standalone monitoring instrument. The sensing element detects changes in the electromagnetic field produced by the conductive target, while the associated electronics converts the probe response into a usable measurement signal.
In a typical turbomachinery installation, the sensor is positioned toward the shaft surface and connected through the appropriate signal-conditioning equipment to a machinery monitoring or protection system. This arrangement allows the control or protection system to observe mechanical movement without placing a physical sensor against the rotating component.
The PR6423/011-100 can therefore be treated as one part of a complete displacement or vibration measurement chain. When replacing an installed probe, the probe type, associated electronics, cable arrangement, mounting position, and existing monitoring configuration should all be checked together.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Eddy Current Sensor |
| Product Series | PR6423 Series |
| Model | PR6423/011-100 |
| Sensor Type | 8mm Eddy Current Sensor |
| Measurement Method | Non-Contacting Eddy Current Measurement |
| Target Type | Conductive Machine Target |
| Application | Rotating Machinery Monitoring |
| Sensor Head Diameter | 8 mm |
| Weight | 0.1 kg |
Product Features
- 8 mm eddy current sensing technology for non-contact machine measurement
- Detects relative movement between the probe and conductive shaft target
- Suitable for static and dynamic displacement measurement
- Applicable to shaft position, eccentricity, and vibration monitoring
- Operates with compatible Epro signal-conditioning electronics
- Suitable for machinery monitoring and protection systems
- Applicable to critical rotating equipment
- Supports maintenance and replacement work on compatible PR6423 Series installations
Working Principle
The PR6423/011-100 measures the distance between its sensing tip and a conductive target by means of an alternating electromagnetic field.
Conductive Machine Target → PR6423/011-100 → Signal Conditioning Electronics → Machinery Monitoring System
When the shaft moves relative to the probe, the distance between the probe tip and the conductive target changes. This alters the eddy-current response at the probe tip. The associated signal-conditioning electronics processes this change and produces a measurement signal for the machinery monitoring system.
Depending on the installation and monitoring configuration, the signal can be used for:
- Shaft radial displacement
- Shaft axial position
- Rotor eccentricity
- Shaft vibration
- Rotational movement
- Machinery protection monitoring
The non-contact measurement method allows the probe to monitor a rotating shaft without introducing mechanical contact between the sensor and the machine component.
Role in a Rotating Machinery Monitoring Architecture
The sensor forms the front-end measurement point of a machinery monitoring chain. Its output is passed to the associated signal-conditioning electronics before reaching the monitoring or protection system.
Rotating Shaft → PR6423/011-100 → Signal Conditioner → Machinery Monitor → Alarm / Protection
| System Element | Function |
|---|---|
| Rotating Shaft | Provides the conductive measurement target |
| PR6423/011-100 | Detects changes in target distance |
| Signal Conditioner | Excites and conditions the sensor signal |
| Machinery Monitor | Processes and displays the measurement |
| Alarm System | Compares measurements with configured alarm limits |
| Protection System | Initiates protective action when trip conditions are reached |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft displacement and vibration monitoring |
| Gas Turbines | Rotor movement and machinery protection |
| Hydro Turbines | Shaft position and dynamic movement measurement |
| Turbo Compressors | Rotor displacement monitoring |
| Centrifugal Compressors | Shaft vibration and position measurement |
| Pumps | Shaft movement and mechanical condition monitoring |
| Generators | Rotor position and vibration monitoring |
| Electric Motors | Shaft movement measurement |
| Industrial Fans | Rotating shaft condition monitoring |
| Process Machinery | Continuous mechanical monitoring |
Installation and Maintenance
- Confirm that the PR6423/011-100 matches the installed measurement system and associated electronics.
- Check the sensor type and application before removing an existing probe.
- Verify that the monitored shaft or target surface is suitable for eddy-current measurement.
- Install the probe securely at the specified measurement location.
- Maintain the required probe-to-target gap for the associated measurement chain.
- Check probe alignment relative to the shaft or monitored surface.
- Inspect the mounting arrangement for looseness or mechanical movement.
- Route the sensor cable away from high-interference power wiring where practical.
- Check connectors for contamination, corrosion, looseness, or physical damage.
- Verify the signal-conditioning electronics and its connection to the monitoring system.
- After installation, check the complete measurement path before returning the machine to normal operation.
- Compare the measured signal with expected shaft behavior during commissioning or startup.
- During maintenance, inspect the probe tip and mounting hardware for contamination or damage.
- If the signal is unstable, check the gap, alignment, cable, signal conditioner, target condition, and monitor before replacing components.
A faulty indication can originate from several points in the measurement chain. Separating probe, cable, conditioning electronics, and monitoring-system checks helps identify the actual source of an abnormal reading.
Related Components
| Component | Function |
|---|---|
| Epro PR6423 Series Probe | Eddy-current sensing element |
| Compatible Signal Conditioner | Provides sensor excitation and signal conditioning |
| Sensor Cable | Connects the probe to the signal-conditioning electronics |
| Machinery Monitor | Receives and processes the conditioned measurement |
| Vibration Monitoring System | Performs continuous rotating machinery monitoring |
| Probe Mounting Hardware | Maintains the required sensor position |
| Machine Shaft / Rotor | Provides the conductive measurement target |
| Machinery Protection System | Provides alarm and trip functions |
| Monitoring Cabinet | Houses associated monitoring electronics |
| Grounding System | Supports proper signal integrity |
Recommended Related Models
| Model / Series | Product Type | Typical Application |
|---|---|---|
| PR6423/011-100 | 8 mm Eddy Current Sensor | Shaft displacement and position monitoring |
| PR6423 Series | Eddy Current Sensor Series | Rotating machinery measurement |
| PR6423/011 Series | 8 mm Eddy Current Sensor | Shaft movement monitoring |
| PR6423/010 Series | 8 mm Eddy Current Sensor | Displacement and position measurement |
| PR6422 Series | Eddy Current Sensor | Machinery condition monitoring |
| PR6424 Series | Eddy Current Sensor | Shaft measurement applications |
| PR6425 Series | Eddy Current Sensor | Machinery displacement monitoring |
| PR6426 Series | Eddy Current Sensor | Critical machinery measurement |
| CON011 | Eddy Current Signal Converter | Signal conditioning for compatible PR642x sensors |
Key Advantages
- Non-contact measurement for rotating machine components
- 8 mm sensing format for machinery displacement applications
- Suitable for shaft position and dynamic movement monitoring
- Compatible with appropriate Epro signal-conditioning electronics
- Applicable to machinery monitoring and protection systems
- Useful for turbines, compressors, pumps, motors, and generators
- Suitable for maintenance and replacement of compatible PR6423 Series systems
Technical FAQs
What type of machinery movement can the PR6423/011-100 detect?
It can be used to detect changes in the relative position between the sensor and a conductive target. In a properly configured monitoring system, this can support shaft displacement, axial position, eccentricity, or vibration-related measurements.
Does the PR6423/011-100 need to physically contact the shaft?
No. The sensor uses eddy-current measurement, so the sensing tip remains separated from the conductive shaft. This allows measurements to be made while the shaft is rotating without mechanical contact between the probe and target.
What components are normally required with this sensor?
The probe normally forms part of a complete measurement chain that includes compatible signal-conditioning electronics, connecting cable, and a machinery monitoring or protection system. The exact combination should match the installed measurement architecture.
What can cause an incorrect PR6423/011-100 measurement?
An incorrect probe-to-target gap, poor alignment, loose mounting, damaged cable, unsuitable target condition, signal-conditioning problems, or monitoring-system faults can all affect the measurement. Checking the complete signal path is preferable to assuming that the probe itself has failed.