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- PR6423/13R-030
- 8mm Eddy Current Sensor
- Germany
- 8 mm
- 0.1 kg
- Xiamen, China
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Product Overview
The Epro PR6423/13R-030 8mm Eddy Current Sensor is a non-contact eddy current probe used for monitoring relative movement between rotating machine components and a stationary sensing point. It is suited to machinery-monitoring applications where shaft displacement, position, or vibration-related movement needs to be measured without physical contact.
The sensor can be applied to critical rotating equipment such as steam turbines, gas turbines, compressors, pumps, generators, and gearboxes. By continuously observing the relationship between the probe and a conductive machine target, the sensor can supply measurement information to a connected machinery monitoring or protection system.
During operation, the probe is installed facing the monitored conductive surface. Changes in the probe-to-target distance modify the eddy-current response, allowing mechanical movement to be converted into an electrical measurement.
For maintenance and troubleshooting, the PR6423/13R-030 should be considered together with its mounting arrangement, associated cabling, signal-conditioning equipment, and monitoring channel. Incorrect installation can produce symptoms that resemble an actual machinery fault.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6423/13R-030 |
| Product Family | PR6423 Series |
| Product Type | Eddy Current Sensor |
| Measurement Principle | Eddy Current |
| Measurement Type | Non-contact displacement measurement |
| Typical Application | Rotating machinery monitoring |
| Sensor Head Diameter | 8 mm |
| Weight | 0.1 kg |
Product Features
- PR6423/13R-030 eddy current sensor for non-contact machinery measurement
- 8 mm sensor head for close-proximity displacement monitoring
- Measures relative movement between the probe and a conductive target
- No mechanical contact with the monitored rotating surface
- Suitable for shaft displacement and position-monitoring applications
- Can be used for vibration-related measurements when incorporated into an appropriate monitoring channel
- Applicable to turbines, compressors, pumps, generators, and other rotating equipment
- Suitable for continuous machinery-condition monitoring
- Can be integrated with compatible signal-conditioning and protection systems
Working Principle
The PR6423/13R-030 operates using an electromagnetic eddy-current principle. The probe generates an electromagnetic field near the monitored conductive target. When the distance between the probe and target changes, the electrical response of the sensing circuit changes accordingly.
For a rotating shaft, radial or axial movement causes the probe gap to vary. These changes are detected by the sensor and passed through the associated signal-conditioning path to the machinery monitoring system.
The measurement path can be represented as:
Rotating Shaft → PR6423/13R-030 Probe → Signal Conditioning → Machinery Monitoring System → Alarm / Protection Logic
In a vibration-monitoring application, repeated changes in shaft position generate a changing measurement signal. The monitoring system can analyze this signal to identify abnormal shaft movement or changes in machine operating condition.
The sensor does not physically touch the rotating target. As a result, probe alignment, mounting rigidity, target condition, and the correct probe gap are critical to obtaining a consistent measurement.
Role in a Rotating Machinery Condition Monitoring Architecture
The PR6423/13R-030 serves as the sensing element at the front end of a rotating-machinery monitoring channel.
Rotating Equipment → Eddy Current Probe → Signal Conditioning → Monitoring System → Alarm / Shutdown → Operator Interface
| System Element | Function |
|---|---|
| Rotating Shaft | Provides the conductive target for non-contact measurement |
| PR6423/13R-030 | Detects changes in the probe-to-target relationship |
| Signal Conditioner | Processes the probe response for the monitoring system |
| Extension Cable | Connects the probe with the associated signal-conditioning equipment |
| Machinery Monitoring System | Processes and evaluates the measurement |
| Vibration Monitoring Channel | Evaluates dynamic shaft movement |
| Shaft Position Channel | Monitors relative shaft displacement |
| Machinery Protection System | Provides alarm and shutdown functions |
| DCS / PLC | Receives selected machinery information for process supervision |
| Operator Interface | Displays machine condition and alarm information |
| Maintenance System | Uses condition data for troubleshooting and maintenance planning |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft position and relative displacement monitoring |
| Gas Turbines | Rotating-shaft condition monitoring |
| Centrifugal Compressors | Shaft movement and machinery protection |
| Pumps | Monitoring abnormal shaft movement |
| Generators | Rotating-shaft displacement supervision |
| Gearboxes | Monitoring rotating components and mechanical condition |
| Turboexpanders | Shaft movement and machinery protection |
| Industrial Fans | Continuous monitoring of rotating assemblies |
| Process Machinery | Non-contact monitoring of critical mechanical movement |
| Machinery Test Equipment | Measurement of dynamic displacement during equipment testing |
Installation and Maintenance
- Verify the sensor model before installation and confirm that the probe is an Epro PR6423/13R-030.
- Confirm the intended measurement point and ensure that the probe faces the correct conductive machine target.
- Set the probe position correctly according to the applicable installation requirements and monitoring-system configuration.
- Inspect the target surface for deposits, corrosion, mechanical damage, or other conditions that could affect the measurement.
- Secure the probe mounting so that the stationary sensor cannot move as a result of machine vibration.
- Inspect the probe and cable assembly for physical damage, excessive bending, loose connections, or damaged insulation.
- Verify the signal-conditioning equipment before connecting the probe to the machinery monitoring system.
- Check wiring and channel assignment to ensure that the sensor is connected to the intended monitoring input.
- Observe the signal during commissioning and compare its behavior with the known mechanical condition of the machine.
- Monitor for unexpected signal fluctuations during normal operation and investigate intermittent or unstable measurements.
- Recheck probe alignment after machinery maintenance whenever work has been performed around the shaft, bearing, probe bracket, or related equipment.
- Maintain installation and maintenance records including sensor replacement, probe positioning, cable inspection, and relevant monitoring observations.
Related Components
| Component | Function |
|---|---|
| PR6423 Series Eddy Current Sensors | Non-contact displacement and proximity measurement |
| Signal Conditioner | Converts or conditions the probe measurement for monitoring |
| Probe Extension Cable | Connects the sensor to the signal-conditioning equipment |
| Machinery Monitoring System | Processes and displays sensor measurements |
| Vibration Monitoring Module | Evaluates dynamic shaft movement |
| Shaft Position Monitoring Channel | Monitors relative shaft displacement |
| Probe Mounting Hardware | Maintains the probe position relative to the machine target |
| Machinery Protection System | Generates configured alarms and shutdown actions |
| DCS / PLC Interface | Transfers selected machinery information to the control system |
| Turbine / Compressor Monitoring System | Provides dedicated supervision of rotating equipment |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Epro PR6423/13R-030 | Eddy Current Sensor | Non-contact rotating-machinery measurement |
| Epro PR6423/13R Series | Eddy Current Sensors | Shaft displacement and vibration-related monitoring |
| Epro PR6423 Series | Eddy Current Sensors | Rotating machinery condition monitoring |
| Epro PR6423/10R Series | Eddy Current Sensors | Non-contact shaft measurement |
| Epro PR6424 Series | Eddy Current Sensors | Machinery displacement monitoring |
| Epro PR6422 Series | Eddy Current Sensors | Non-contact proximity measurement |
| Epro Machinery Protection Systems | Monitoring System | Turbine and rotating-equipment protection |
Key Advantages
- Non-contact measurement of rotating-machine movement
- Compact 8 mm sensor head
- Suitable for shaft displacement and position monitoring
- Applicable to vibration-related monitoring channels
- Suitable for turbines, compressors, pumps, generators, and gearboxes
- Can operate as the sensing element of a machinery protection channel
- Useful for continuous rotating-equipment condition monitoring
Technical FAQs
What does the Epro PR6423/13R-030 detect?
The PR6423/13R-030 detects changes in the distance between the eddy current probe and a conductive target. In rotating machinery, this can be used to monitor relative shaft displacement, position, or dynamic movement.
Does the PR6423/13R-030 contact the rotating shaft?
No. It uses non-contact eddy current sensing. The probe is installed with a controlled gap from the conductive target, allowing shaft movement to be measured without physical contact.
Why can incorrect probe positioning affect the measurement?
The eddy-current response depends on the relationship between the probe and the conductive target. Incorrect positioning, unstable mounting, or an unsuitable probe gap can therefore cause inaccurate, unstable, or misleading measurement signals.
What should be checked if the PR6423/13R-030 produces an unstable signal?
Check the probe mounting, target surface, probe gap, cable connections, signal-conditioning equipment, and monitoring input. If these areas are correct, the actual mechanical condition of the shaft and surrounding machinery should then be investigated.