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- PR6423/012-130
- 8mm Eddy Current Sensor
- Germany
- 8 mm
- 0.1 kg
- Xiamen, China
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Product Overview
The Epro PR6423/012-130 8mm Eddy Current Sensor is a non-contact proximity sensor for measuring the relative movement of conductive machine components. It is commonly used on rotating equipment where the position or displacement of a shaft needs to be observed without placing a mechanical sensing element directly against the moving surface.
The sensor is installed close to the monitored target and detects changes in the electromagnetic interaction between its sensing element and the conductive shaft. This makes it suitable for measurement points where conventional contact-based sensors would introduce mechanical loading or wear.
In rotating machinery, the probe can form part of a shaft vibration, radial displacement, or axial-position measurement channel. The actual measurement function depends on the mechanical location of the probe and the configuration of the associated driver and monitoring equipment.
Probe installation has a direct effect on measurement quality. The mounting position, target surface, probe gap, and mechanical stability should therefore be checked as part of commissioning and routine machinery maintenance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Epro |
| Model | PR6423/012-130 |
| 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 measurement of conductive targets
- Suitable for rotating shaft monitoring
- Supports displacement and position measurement arrangements
- Can be incorporated into machinery vibration monitoring channels
- Suitable for continuous observation of rotating equipment
- Works with compatible eddy current driver electronics
- Applicable to turbines, compressors, pumps, motors, and generators
Working Principle
The PR6423/012-130 uses the interaction between an electromagnetic field and a conductive target to detect relative movement. The probe generates an alternating electromagnetic field around its sensing element. When a conductive shaft is positioned within the sensing range, eddy currents are induced in the target.
Movement of the shaft changes the distance between the target and the probe. This changes the electrical response of the sensing circuit, allowing compatible driver electronics to translate the change into a usable displacement-related signal.
Conductive Machine Target → PR6423/012-130 → Eddy Current Driver → Monitoring Electronics
For a shaft vibration channel, the probe detects small radial changes as the shaft rotates. With a suitable mechanical arrangement, the same sensing principle can be used to observe axial movement or another defined displacement.
The probe itself performs the machine-side sensing. Signal conditioning, measurement scaling, alarm evaluation, and protection functions are handled by the connected electronics and monitoring system.
Role in a Rotating Machinery Monitoring Architecture
The PR6423/012-130 serves as the sensing point installed directly at the monitored machine. It detects changes in the position of a conductive target and passes the sensor response to the associated driver electronics.
Rotating Shaft → PR6423/012-130 → Driver / Signal Conditioning → Machinery Monitoring System → Alarm / Protection
| System Element | Function |
|---|---|
| Rotating Shaft | Provides the conductive target for measurement |
| PR6423/012-130 | Detects relative movement between the probe and target |
| Eddy Current Driver | Interfaces with the probe and conditions its signal |
| Extension Cable | Connects the probe to associated electronics where required |
| Machinery Monitoring System | Evaluates displacement or vibration information |
| Protection System | Generates configured alarm or protective actions |
| Control System | Uses available machinery-condition data for supervision |
The probe does not independently analyze machine condition or execute protection logic. Those functions depend on the connected driver and monitoring equipment.
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft vibration and displacement monitoring |
| Gas Turbines | Rotor movement measurement |
| Centrifugal Compressors | Shaft position and vibration supervision |
| Industrial Pumps | Non-contact shaft displacement monitoring |
| Large Motors | Rotor movement and vibration measurement |
| Generators | Shaft position and condition monitoring |
| Gearboxes | Rotating component displacement monitoring |
| Critical Rotating Equipment | Continuous proximity measurement for machinery protection |
Installation and Maintenance
- Confirm that the PR6423/012-130 is compatible with the intended driver and monitoring system.
- Select a mechanically stable mounting position close to the monitored conductive target.
- Inspect the target surface for conditions that could affect proximity measurement.
- Position the probe so that its sensing axis is correctly aligned with the intended target.
- Set the probe-to-target gap according to the applicable installation requirements.
- Secure the probe against movement caused by machine vibration.
- Route the sensor cable so that it is protected from mechanical stress and excessive heat.
- Check the probe and driver connections before energizing the measurement channel.
- Verify the sensor response with the machine stopped.
- Observe the measurement during controlled machine startup.
- Inspect probe mounting, cable condition, and mechanical alignment during scheduled maintenance.
- After replacing or repositioning the probe, verify the measurement signal and associated alarm or protection functions before returning the machine to service.
Compatible System Components
| Component | Function |
|---|---|
| Eddy Current Driver | Provides the sensor interface and converts the probe response |
| Probe Extension Cable | Provides the required connection between probe and driver |
| Machinery Monitoring Module | Receives and evaluates the conditioned sensor signal |
| Vibration Monitoring System | Processes shaft vibration and displacement information |
| Machine Protection System | Uses measured conditions for configured protection functions |
| Probe Mounting Hardware | Maintains sensor alignment and mechanical stability |
| Rotating Shaft | Provides the conductive target |
| Control System | Uses available machinery-condition information for supervision |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| 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 PR6423/012-010 | 8mm Eddy Current Sensor | Non-contact shaft displacement measurement |
| Epro PR6423/012-030-CN | 8mm Eddy Current Sensor | Rotating machinery proximity monitoring |
| Epro MMS Series | Machinery Monitoring System | Machinery condition and protection monitoring |
Key Advantages
- Measures conductive machine targets without physical contact.
- Suitable for monitoring small relative movements of rotating shafts.
- Can be incorporated into radial vibration or displacement measurement channels.
- The 8 mm sensing head suits established PR6423 proximity-monitoring installations.
- Suitable for continuous monitoring where mechanical contact would be undesirable.
- Can work as the machine-side sensing element in a larger machinery protection channel.
Technical FAQs
What type of target should be monitored with the PR6423/012-130?
The sensor works with conductive machine targets and is commonly positioned toward a rotating shaft or similarly suitable machine surface. The target characteristics and mechanical arrangement should be considered when establishing the measurement channel.
How does probe alignment affect the measurement?
The probe must be positioned consistently relative to the intended target. Changes in alignment or unwanted probe movement can alter the measured distance and may appear as a machine displacement signal even when the actual shaft movement has not changed.
What should be checked before commissioning a newly installed PR6423/012-130?
Check the probe mounting, target condition, probe-to-target gap, cable connection, and associated driver. The resulting signal should be verified before the machine is brought to normal operating speed.
Can a faulty probe be identified only from the monitoring-system reading?
Not necessarily. An abnormal reading can also result from the driver, cabling, probe mounting, target condition, or configuration. A complete channel check is preferable before replacing the sensor.