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- PR6423/012-030-CN
- 8mm Eddy Current Sensor
- Germany
- 8 mm
- 0.1 kg
- Xiamen, China
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Product Overview
The Epro PR6423/012-030-CN 8mm Eddy Current Sensor is a non-contact sensor used to detect changes in the position of conductive machine components. It is particularly suited to rotating machinery where direct contact with a moving shaft is undesirable and where continuous observation of shaft movement is required.
The probe can be installed close to a conductive shaft or other rotating target and used as part of a machinery monitoring arrangement. Changes in the distance between the probe and the target alter the electromagnetic response of the sensing element, allowing the associated electronics to determine relative movement.
In practical machinery applications, the sensor is used together with an appropriate driver and monitoring system rather than as an independent measurement instrument. The resulting signal can be used for shaft vibration, radial displacement, axial position, or other mechanical measurements depending on the probe installation and monitoring configuration.
The -CN version should be selected together with the applicable driver, cable arrangement, and monitoring equipment. Mechanical installation is equally important because probe stability and the probe-to-target relationship directly affect measurement quality.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6423/012-030-CN |
| Product Family | PR6423 Series |
| Product Series | PR6423 |
| Product Type | 8mm Eddy Current Sensor |
| Primary Function | Non-contact displacement and position measurement |
| System Role | Eddy current sensing element |
| Typical Application | Rotating machinery monitoring |
| Sensor Head Diameter | 8 mm |
| Weight | 0.1 kg |
Product Features
- 8 mm eddy current sensing head
- Non-contact detection of conductive machine targets
- Suitable for rotating shaft monitoring
- Can be used for displacement and position measurement
- Suitable for machinery vibration monitoring arrangements
- Works with compatible eddy current driver electronics
- Applicable to continuous machinery condition monitoring
- Suitable for turbine, compressor, pump, motor, and generator applications
Working Principle
The PR6423/012-030-CN uses an electromagnetic sensing method to determine the relative position of a conductive target. The probe generates an alternating electromagnetic field around its sensing element. When a conductive shaft enters this field, eddy currents are induced in the target.
The strength of this interaction changes with the distance between the probe and the target. As the shaft moves during machine operation, the associated driver detects the resulting electrical change and converts it into a measurement signal.
Conductive Shaft → PR6423/012-030-CN → Eddy Current Driver → Monitoring System
For vibration monitoring, small changes in the shaft-to-probe distance are tracked while the shaft rotates. For position monitoring, the same sensing principle can be applied to observe a defined movement of the machine component. The final measurement depends on how the probe is mechanically positioned and how the driver and monitoring system are configured.
The sensor itself is therefore the measurement pickup at the machine side. Signal conditioning, measurement interpretation, alarm thresholds, and protection actions are handled by the downstream electronics.
Role in a Rotating Machinery Monitoring Architecture
The PR6423/012-030-CN is installed at the machine as the sensing point of a proximity measurement channel. It detects relative movement of the conductive target and passes the resulting sensor response to compatible driver electronics.
Rotating Shaft → PR6423/012-030-CN → Driver / Signal Conditioning → Machinery Monitoring System → Alarm / Protection
| System Element | Function |
|---|---|
| Rotating Shaft | Provides the conductive target being monitored |
| PR6423/012-030-CN | Detects changes in the shaft-to-probe relationship |
| Eddy Current Driver | Provides the sensor interface and conditions the signal |
| Extension Cable | Connects the probe with the associated electronics where required |
| Machinery Monitoring System | Evaluates displacement or vibration information |
| Protection System | Generates configured alarm or shutdown actions |
| Control System | Uses available machine-condition information for supervision |
The sensor does not independently generate the final alarm or protection decision. Its measurement becomes useful when combined with the appropriate driver and monitoring equipment.
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbine Systems | Monitoring shaft vibration and mechanical movement |
| Gas Turbine Equipment | Non-contact shaft displacement measurement |
| Centrifugal Compressors | Monitoring rotor movement and vibration |
| Industrial Pumps | Observing shaft displacement during operation |
| Large Electric Motors | Shaft position and vibration monitoring |
| Generators | Rotor movement and condition monitoring |
| Rotating Machinery Trains | Continuous proximity measurement |
| Machinery Protection Systems | Feeding displacement information to protection electronics |
Installation and Maintenance
- Confirm that the PR6423/012-030-CN is compatible with the intended driver and monitoring system.
- Select a mounting location that provides a stable mechanical reference for the probe.
- Check that the monitored target is suitable for eddy current measurement.
- Position the sensing head correctly relative to the shaft or conductive target.
- Establish the required probe-to-target gap using the applicable installation procedure.
- Secure the probe to prevent movement caused by machine vibration.
- Protect the sensor cable from excessive bending, pulling, heat, and mechanical damage.
- Check all probe and driver connections before energizing the monitoring channel.
- Verify the sensor signal with the machine stopped before startup.
- Observe the measurement as the machine reaches operating speed and check for abnormal fluctuations.
- Inspect the probe mounting, cable, and target area during scheduled machinery maintenance.
- After sensor replacement or repositioning, verify the measurement channel and configured alarm or protection functions before returning the machine to service.
Compatible System Components
| Component | Function |
|---|---|
| Eddy Current Driver | Interfaces with the probe and conditions its measurement response |
| Probe Extension Cable | Provides the connection between sensor and driver when required |
| Machinery Monitoring Module | Receives and evaluates the conditioned sensor signal |
| Vibration Monitoring System | Processes shaft movement and vibration information |
| Machine Protection System | Uses monitored values for configured protection functions |
| Probe Mounting Hardware | Maintains probe position and mechanical stability |
| Rotating Shaft | Provides the conductive measurement target |
| Control System | Receives available machine-condition information for supervision |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Epro PR6423 Series | Eddy Current Sensor | Rotating machinery displacement measurement |
| Epro PR6423/010 Series | 8mm Eddy Current Sensor | Shaft vibration and position monitoring |
| Epro PR6423/011 Series | 8mm Eddy Current Sensor | Non-contact shaft displacement measurement |
| Epro PR6423/012 Series | 8mm Eddy Current Sensor | Rotating machinery monitoring |
| Epro CON Series | Eddy Current Signal Converter | Sensor signal conditioning |
| Epro MMS Series | Machinery Monitoring System | Machinery vibration and protection monitoring |
Key Advantages
- Non-contact sensing allows the probe to monitor moving conductive targets without physical contact.
- The 8 mm sensing head is suited to proximity measurement arrangements on rotating machinery.
- Small shaft movements can be monitored continuously through the associated driver electronics.
- Can be incorporated into vibration, displacement, and position measurement channels.
- Suitable for machinery monitoring systems where stable shaft-position information is required.
- The sensor can be installed at the machine while signal processing remains in the associated electronics.
Technical FAQs
What is the purpose of the -CN designation in PR6423/012-030-CN?
The suffix forms part of the complete sensor ordering designation and should be retained when identifying or replacing the probe. Compatibility should be checked against the installed driver, cable arrangement, and existing monitoring channel rather than selecting a probe based only on the basic PR6423 series.
How does the sensor detect shaft movement without touching the shaft?
The sensing element generates an electromagnetic field around the probe. Movement of the conductive shaft changes its interaction with this field, and the associated driver converts that change into a usable proximity measurement.
Why is the probe-to-shaft gap important?
The distance between the sensing head and target directly affects the electromagnetic response of the probe. An incorrect gap can result in an unsuitable measurement range, unstable output, or inaccurate machinery monitoring.
What should be investigated if the sensor signal changes when the machine is stationary?
First check the probe mounting, cable connections, driver electronics, and mechanical stability. Unwanted movement of the probe, connection problems, electrical interference, or an issue in the driver can cause a changing signal even when the monitored shaft is not rotating.