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- PR6423/011-000
- 8mm Eddy Current Sensor
- Germany
- 8 mm
- 0.1 kg
- Xiamen, China
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Product Overview
The Epro PR6423/011-000 8mm Eddy Current Sensor is a non-contact displacement sensor used for monitoring the relative movement between a rotating machine shaft and a fixed reference point. It belongs to the PR6423 family of eddy-current sensors and is intended for machinery condition monitoring and protection applications.
The sensor operates by establishing an electromagnetic field at its sensing tip and detecting changes caused by a conductive machine target. As the shaft moves toward or away from the probe, the resulting electrical response changes accordingly. This allows the monitoring system to evaluate shaft displacement and dynamic movement without requiring physical contact.
In rotating equipment, the PR6423/011-000 can be positioned near a shaft, thrust collar, or other suitable conductive target. The sensor output is normally connected to compatible signal-conditioning electronics before being transferred to a machinery monitoring or protection system.
The probe is particularly useful in applications where continuous measurement is required and mechanical contact would introduce wear, friction, or an additional failure point.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Eddy Current Sensor |
| Product Series | PR6423 Series |
| Model | PR6423/011-000 |
| Sensor Type | 8 mm 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
- Uses eddy-current technology for non-contact displacement measurement.
- Suitable for monitoring conductive rotating-machine targets.
- Supports shaft movement and relative displacement monitoring.
- Operates without physical contact with the rotating component.
- Suitable for continuous machinery condition monitoring.
- Can be connected to compatible signal-conditioning electronics.
- Applicable to machinery protection and vibration monitoring systems.
- Suitable for turbines, compressors, pumps, motors, generators, and other rotating equipment.
- Supports applications where mechanical contact measurement is impractical.
- Useful for maintenance and replacement of compatible Epro monitoring systems.
Working Principle
The PR6423/011-000 generates an electromagnetic field at the probe tip. When a conductive shaft or other machine target enters the sensing field, the target modifies the electrical characteristics of the sensor circuit.
Changes in the distance between the probe and the target produce corresponding changes in the sensor signal. The associated monitoring electronics can then use this signal to determine shaft position or dynamic movement.
Conductive Machine Target → PR6423/011-000 → Signal Conditioning Electronics → Machinery Monitoring System
For rotating machinery, the sensor can detect cyclic changes in the probe gap caused by shaft vibration or other mechanical movement. Static changes in shaft position can also be monitored when the sensor is installed for an appropriate displacement measurement.
Role in a Machinery Monitoring Architecture
The PR6423/011-000 acts as the sensing point between the rotating machine and the machinery monitoring electronics.
Rotating Shaft → PR6423/011-000 → Signal Conditioner → Machinery Monitor → Alarm / Protection Logic
| System Element | Function |
|---|---|
| Rotating Shaft / Target | Provides the conductive surface being monitored |
| PR6423/011-000 | Detects changes in the probe-to-target relationship |
| Signal Conditioning Electronics | Converts and conditions the sensor signal |
| Machinery Monitor | Evaluates shaft movement and machine condition |
| Protection System | Generates alarm or trip actions when configured limits are exceeded |
| Control System | Uses available machine-status information |
| Operator Interface | Displays measurement and alarm information |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft displacement and vibration-related monitoring |
| Gas Turbines | Non-contact rotor movement measurement |
| Turbo Compressors | Monitoring shaft behavior during operation |
| Centrifugal Compressors | Continuous relative shaft movement monitoring |
| Centrifugal Pumps | Detection of abnormal shaft movement |
| Electric Motors | Monitoring rotating-shaft condition |
| Generators | Rotor displacement and vibration monitoring |
| Industrial Blowers | Continuous rotating equipment monitoring |
| Process Machinery | Integration with machinery protection systems |
Installation and Maintenance
- Verify that the PR6423/011-000 is compatible with the associated signal-conditioning and monitoring electronics.
- Select a suitable conductive machine target for the eddy-current measurement.
- Install the probe so that the sensing axis is correctly aligned with the target surface.
- Establish the required probe-to-target gap according to the applicable installation procedure.
- Secure the probe mounting hardware to prevent movement caused by machine vibration.
- Route the sensor cable away from high-current power conductors and strong electromagnetic interference sources.
- Avoid excessive bending, pulling, or mechanical stress on the sensor cable.
- Check the probe connector and downstream signal connection before commissioning.
- Inspect the sensor tip for contamination or evidence of contact with the rotating target.
- Verify the monitoring-system reading against the known machine condition during startup.
- If the signal is unstable, check the probe gap, mounting position, target surface, cable routing, and electrical connections.
- If the signal disappears completely, check the complete path from the sensor to the signal-conditioning electronics and monitoring input.
- During scheduled maintenance, inspect the probe mounting and cable for loosening, wear, or mechanical damage.
- After replacing the sensor, verify the measurement response and configured alarm thresholds before returning the machinery protection system to normal service.
Correct probe positioning is critical for eddy-current measurement. A mechanically loose probe or unsuitable gap can produce abnormal readings even when the sensor electronics remain functional.
Related Components
| Component | Function |
|---|---|
| Epro PR6423 Series Sensor | Provides non-contact eddy-current measurement |
| Signal Conditioner | Processes the probe signal for monitoring electronics |
| Proximity Monitoring Electronics | Evaluates shaft displacement and dynamic movement |
| Extension Cable | Provides the required connection between sensor and electronics where applicable |
| Probe Mounting Hardware | Maintains the sensor position relative to the machine target |
| Rotating Shaft | Provides the conductive measurement target |
| Machinery Monitor | Displays and evaluates the sensor measurement |
| Machinery Protection System | Provides alarm and shutdown functions |
| Monitoring Cabinet | Houses associated monitoring equipment |
| Grounding System | Supports appropriate electrical signal conditions |
Recommended Related Models
| Model | Product Family / Type | Typical Application |
|---|---|---|
| PR6423/011-000 | Epro PR6423 Series | 8 mm eddy-current displacement measurement |
| PR6423 Series | Epro Eddy Current Sensor | Rotating machinery monitoring |
| PR6423/010 Series | Epro 8 mm Eddy Current Sensor | Shaft displacement and vibration monitoring |
| PR6424 Series | Epro Eddy Current Sensor | Larger-target displacement applications |
| PR6422 Series | Epro Eddy Current Sensor | Non-contact machinery measurement |
| PR6421 Series | Epro Eddy Current Sensor | Shaft displacement monitoring |
| PR9268 Series | Epro Vibration Sensor | Machinery vibration measurement |
| MMS 6000 | Epro Machinery Monitoring System | Machinery protection and condition monitoring |
Key Advantages
- Non-contact measurement: Detects conductive shaft movement without physical contact.
- 8 mm sensing format: Suitable for rotating machinery monitoring installations requiring an 8 mm probe.
- Direct machinery feedback: Provides measurement information for downstream monitoring electronics.
- Continuous operation: Suitable for permanent machinery condition monitoring.
- Low mechanical wear: Eliminates probe-to-shaft contact during normal measurement.
- Broad machinery compatibility: Applicable to turbines, compressors, pumps, motors, and generators.
- Suitable for protection systems: Can form part of a complete machinery displacement or vibration monitoring loop.
Technical FAQs
What type of movement can the PR6423/011-000 detect?
The sensor detects changes in the distance between the probe and a conductive target. In machinery applications, this can represent shaft displacement, radial movement, axial movement, or vibration depending on how the probe is installed.
Does the PR6423/011-000 measure the shaft by physical contact?
No. It uses an eddy-current principle and measures the conductive target without touching it. Maintaining the correct operating gap is therefore essential for accurate measurement.
What equipment is normally connected after the PR6423/011-000?
The sensor normally connects to compatible signal-conditioning electronics, which then provide the processed measurement to a machinery monitoring or protection system. The probe itself is the sensing element rather than a complete monitoring system.
What are common causes of an abnormal PR6423/011-000 signal?
Incorrect probe gap, probe misalignment, loose mounting, damaged cabling, poor electrical connections, target-surface problems, or faults in the associated signal-conditioning electronics can all affect the measurement. Checking the mechanical installation and complete signal path is preferable to immediately replacing the sensor.