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- Bently Nevada
- 21505-000-040-90-02
- 7200 Series Proximity Probe
- USA
- 9 meters
- 0.22 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 21505-000-040-90-02 7200 Series Proximity Probe is a non-contact proximity probe designed for rotating machinery condition monitoring. It is used to detect changes in the relative position between the probe and a conductive target, typically the surface of a rotating shaft.
In machinery monitoring systems, shaft displacement and vibration are important indicators of equipment condition. The probe works together with compatible proximity electronics to convert changes in the sensing field into an electrical signal that can be monitored and analyzed.
The probe is suitable for applications involving turbines, compressors, pumps, motors, generators, and other rotating equipment where continuous shaft monitoring is required.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 21505-000-040-90-02 |
| 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 | 9 meters |
| Weight | 0.22 kg |
| Typical Application | Turbines, Compressors, Pumps, Motors and Generators |
Product Features
The 21505-000-040-90-02 is designed for machinery monitoring installations where the sensing point may be located some distance from the associated monitoring electronics.
Key characteristics include:
- Bently Nevada 7200 Series proximity probe design
- Non-contact measurement principle
- Suitable for shaft displacement monitoring
- Supports rotating machinery vibration monitoring
- Designed for use with compatible proximity electronics
- Long 9-meter total length configuration
- Suitable for installations requiring extended probe cable routing
- Stated weight of 0.22 kg
- Suitable for continuous industrial machinery monitoring
The long total length can be useful when the probe installation point and associated monitoring electronics are physically separated within a machinery installation.
Working Principle
The probe detects changes in the distance between its sensing tip and a conductive target.
A typical monitoring path is:
Proximity Probe → Proximity Electronics → Monitoring System → Alarm / Protection
The probe is installed close to the monitored shaft. As the shaft moves, the distance between the target and probe changes. This produces a corresponding change in the sensing characteristics.
The associated proximity electronics process the probe signal and provide a usable output to the monitoring system. The system can then evaluate shaft displacement, vibration, and other changes in machine operating condition.
Because the probe operates without physical contact, it can monitor a rotating shaft continuously without introducing mechanical wear at the sensing point.
Role in Machinery Condition Monitoring
The 21505-000-040-90-02 functions as the sensing element within a complete machinery monitoring system.
| Function | Description |
|---|---|
| Shaft Displacement Monitoring | Detects relative shaft movement |
| Vibration Monitoring | Provides displacement information for vibration analysis |
| Non-Contact Sensing | Monitors the target without physical contact |
| Continuous Measurement | Supports ongoing machinery condition monitoring |
| Fault Detection | Helps identify abnormal shaft behavior |
| Protection Support | Supplies measurement information to monitoring equipment |
The probe provides the physical sensing function, while the associated electronics handle signal conditioning and the monitoring system performs analysis, alarming, and protective functions.
Industrial Applications
The 7200 Series proximity probe can be integrated into various rotating equipment monitoring systems.
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft vibration and displacement 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 application depends on the machine configuration, target material, mounting position, and compatible monitoring electronics.
Installation and Maintenance
The 9-meter total length makes cable routing an important consideration during installation. The cable should be routed carefully to avoid unnecessary mechanical stress, sharp bends, excessive heat, and interference from other equipment.
Before installation or replacement, verify the complete part number and compatibility with the existing monitoring system.
Recommended checks include:
- Confirm the complete 21505-000-040-90-02 part number.
- Verify compatibility with the associated proximity electronics.
- Inspect the probe tip for damage.
- Check the entire cable for cuts, crushing, or abrasion.
- Inspect the connector for contamination or physical damage.
- Maintain the required probe-to-target clearance.
- Ensure correct probe alignment.
- Route the 9-meter cable without excessive tension.
- Keep the cable away from high-temperature surfaces.
- Avoid unnecessary proximity to strong electrical noise sources.
- Secure the cable appropriately.
- Verify the probe signal after installation.
- Compare the measured output with expected machine conditions.
When troubleshooting an abnormal reading, both the probe and its long cable run should be inspected. A damaged or poorly routed cable can affect the measurement even when the probe itself is functioning normally.
Related Components
The probe normally operates as part of a larger 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 Hardware | Supports connection to monitoring electronics |
The probe and associated electronics should be evaluated together when selecting replacement components.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Bently Nevada 21505-000-040-90-02 | 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 21504-12-28-10-02 | 7200 Series 8 mm Probe | Shaft displacement measurement | Rotating equipment |
| Bently Nevada 21504-12-32-10-02 | 7200 Series 8 mm Probe | Shaft vibration and displacement measurement | Industrial machinery |
| Bently Nevada 7200 Series | Proximity Probe Family | Rotating machinery monitoring | Turbines and rotating equipment |
When selecting a replacement, the complete part number should be matched. Total length, probe configuration, connector arrangement, mounting requirements, and compatibility with the associated proximity electronics should all 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
- Compatible with appropriate proximity monitoring electronics
- 9-meter total length for extended installation requirements
- Suitable for turbines, compressors, pumps, motors, and generators
- Stated weight of 0.22 kg
Technical FAQs
Why would a 9-meter probe configuration be used in a machinery monitoring system?
A longer configuration can accommodate installations where the sensing location is relatively far from the associated monitoring electronics. It provides additional routing distance without requiring an unsuitable cable arrangement.
Does the 9-meter length change the basic sensing principle?
No. The probe still performs non-contact proximity measurement. The extended length primarily affects the physical installation and connection arrangement.
What should be considered when routing a 9-meter probe cable?
The cable should be protected from mechanical damage, excessive bending, high temperatures, strong electrical interference, and unnecessary tension. Proper routing is important for maintaining signal integrity.
What could cause a long probe cable to produce an abnormal measurement?
Physical damage, poor connector contact, excessive electromagnetic interference, improper routing, or problems in the associated proximity electronics can affect the measurement signal.