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- Bently Nevada
- 21505-00-28-05-02
- 7200 Series Proximity Probe
- USA
- 0.5 meters
- 0.22 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 21505-00-28-05-02 7200 Series Proximity Probe is a non-contact proximity probe used in rotating machinery condition-monitoring systems. It is designed to detect changes in the relative position between the probe and a conductive machine target, most commonly a rotating shaft.
In a machinery monitoring installation, the probe works with compatible proximity electronics to convert changes in shaft position into an electrical measurement signal. This information can then be used for monitoring shaft displacement, vibration, and changes in the operating condition of critical rotating equipment.
The probe is suitable for applications involving turbines, compressors, pumps, motors, generators, and other rotating machinery where reliable shaft monitoring is required.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 21505-00-28-05-02 |
| Product Type | 7200 Series Proximity Probe |
| Series | 7200 Series |
| Sensor Type | Non-Contact Proximity Probe |
| Main Function | Shaft Displacement and Vibration Monitoring |
| Measurement Principle | Eddy Current / Proximity Sensing |
| Application | Rotating Machinery Condition Monitoring |
| Total Length | 0.5 meters |
| Weight | 0.22 kg |
| Typical Application | Turbines, Compressors, Pumps, Motors and Generators |
Product Features
The 21505-00-28-05-02 is intended for applications where shaft movement needs to be monitored without physical contact with the rotating component.
Key characteristics include:
- Bently Nevada 7200 Series proximity probe design
- Non-contact sensing principle
- Suitable for shaft displacement measurement
- Supports vibration monitoring applications
- Designed to operate with compatible proximity electronics
- Suitable for continuous rotating machinery monitoring
- Total length of 0.5 meters
- Stated weight of 0.22 kg
- Suitable for industrial condition-monitoring systems
The non-contact design is particularly useful for rotating equipment because the probe can remain stationary while monitoring a continuously rotating shaft.
Working Principle
The probe detects changes in the distance between its sensing tip and a conductive target.
A typical measurement chain is:
Proximity Probe → Proximity Electronics → Monitoring System → Alarm / Protection
When the monitored shaft moves relative to the probe, the characteristics of the sensing field change. The associated proximity electronics process this change and generate a corresponding measurement signal.
The monitoring system can use this signal to evaluate shaft displacement and vibration behavior. Continuous measurements can help identify abnormal changes in machine operation and provide information for condition-based maintenance.
Role in Machinery Condition Monitoring
The 21505-00-28-05-02 functions as the sensing element within a larger machinery protection or condition-monitoring system.
| Function | Description |
|---|---|
| Shaft Displacement Monitoring | Detects relative movement between the probe and shaft |
| Vibration Monitoring | Provides displacement information for vibration analysis |
| Non-Contact Measurement | Monitors rotating targets without physical contact |
| Continuous Monitoring | Supports ongoing machinery observation |
| Condition Assessment | Provides information about shaft movement |
| Protection Support | Supplies measurement data to monitoring equipment |
The probe itself performs the sensing function. Signal conditioning, measurement processing, alarming, and protective actions are handled by the associated electronics and monitoring equipment.
Industrial Applications
The 7200 Series proximity probe can be integrated into monitoring systems for various types of rotating equipment.
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft displacement and vibration monitoring |
| Gas Turbines | Rotor condition monitoring |
| Compressors | Shaft movement detection |
| Pumps | Rotating equipment monitoring |
| Motors | Shaft vibration measurement |
| Generators | Rotor monitoring |
| Industrial Fans | Rotating shaft condition monitoring |
| Process Machinery | Continuous condition monitoring |
The actual installation arrangement depends on the machine design, shaft configuration, mounting location, and associated monitoring electronics.
Installation and Maintenance
Correct installation is important because the probe-to-target distance directly affects the sensing signal.
Before installing or replacing the probe, verify the complete part number and confirm compatibility with the existing proximity electronics.
Recommended checks include:
- Confirm the complete 21505-00-28-05-02 part number.
- Verify compatibility with the monitoring system.
- Inspect the probe tip for physical damage.
- Check the cable and connector for damage.
- Install the probe securely.
- Maintain the required probe-to-target clearance.
- Ensure proper alignment with the monitored shaft.
- Avoid excessive cable tension.
- Prevent sharp bends in the cable.
- Keep the cable away from excessive heat and mechanical stress.
- Verify the output signal after installation.
- Compare measured values with expected machine conditions.
If the measurement becomes unstable, the probe, cable, mounting position, shaft target, and associated proximity electronics should all be inspected.
Related Components
The probe normally works together with several other components in a machinery monitoring system.
| Component | Function |
|---|---|
| 7200 Series Proximity Probe | Detects shaft displacement |
| Proximity Electronics | Conditions and processes the probe signal |
| Monitoring Module | Processes machinery measurement data |
| Vibration Monitor | Analyzes vibration information |
| Machine Protection System | Provides alarms and protective actions |
| Shaft Target | Conductive surface being monitored |
| Extension / Connection Cable | Connects the sensing system to associated electronics |
Selecting compatible components is important because the probe and proximity electronics operate as part of an integrated measurement system.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Bently Nevada 21505-00-28-05-02 | 7200 Series Proximity Probe | Shaft displacement monitoring | Rotating machinery |
| Bently Nevada 21505-000-012-05-02 | 7200 Series Proximity Probe | Non-contact displacement sensing | Machinery monitoring |
| Bently Nevada 21505-000-040-90-02 | 7200 Series Proximity Probe | Shaft monitoring | Rotating equipment |
| Bently Nevada 21504-12-28-10-02 | 7200 Series 8 mm Probe | Shaft displacement measurement | Rotating machinery |
| Bently Nevada 21504-12-32-10-02 | 7200 Series 8 mm Probe | Shaft vibration and displacement measurement | Industrial machinery |
When selecting a replacement, the complete probe part number should be matched. Cable length, probe configuration, connector arrangement, mounting requirements, and compatibility with the associated proximity electronics should also be checked.
Key Advantages
- Bently Nevada 7200 Series proximity probe design
- Non-contact shaft monitoring
- Suitable for displacement and vibration measurement
- Designed for continuous rotating machinery monitoring
- Works with compatible proximity electronics
- Compact 0.5-meter total length
- Suitable for turbines, compressors, pumps, motors, and generators
- Stated weight of 0.22 kg
Technical FAQs
What is the primary measurement function of the 21505-00-28-05-02?
The probe detects changes in the relative position between its sensing tip and a conductive target. In rotating machinery applications, this information can be used for shaft displacement and vibration monitoring.
Why is non-contact sensing preferred for rotating shafts?
Non-contact sensing allows the probe to monitor a rotating component without physical contact. This avoids mechanical wear at the sensing point while allowing continuous measurement during machine operation.
What factors affect the accuracy of a proximity probe measurement?
Probe-to-target clearance, alignment, shaft condition, cable integrity, electrical interference, and the performance of the associated proximity electronics can all affect measurement quality.
What should be inspected if the probe output suddenly changes?
The probe tip, cable, connector, mounting position, probe-to-shaft clearance, shaft condition, and proximity electronics should be checked. A sudden signal change does not necessarily mean that the probe itself has failed.