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- Bently Nevada
- 21504-04-36-10-02
- 7200 Series 8 mm Probe
- USA
- 1 meter
- 0.22 kg
- Xiamen, China
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Product Overview
The Bently Nevada 21504-04-36-10-02 7200 Series 8 mm Probe is a non-contact proximity probe used in rotating machinery monitoring and protection systems. It provides a measurement point for detecting relative movement between a stationary probe and a conductive rotating shaft.
Shaft vibration, radial movement, and changes in shaft position are important parameters when monitoring turbines, compressors, generators, pumps, and other critical rotating equipment. By measuring the changing distance between the probe tip and shaft surface, a proximity monitoring system can obtain information about shaft movement without physically contacting the rotating component.
The 21504-04-36-10-02 belongs to the Bently Nevada 7200 Series 8 mm Probe family. It is normally integrated with compatible driver electronics, cabling, and machinery monitoring equipment. The probe performs the sensing function, while the associated electronics condition and process the measurement signal.
The 1 meter total length provides additional installation reach compared with shorter configurations. This can be useful when the probe mounting point and associated connection equipment are separated by a greater physical distance within a machinery installation.
The stated weight of the 21504-04-36-10-02 is 0.22 kg. Its 8 mm probe configuration provides a compact sensing solution for industrial machinery where continuous shaft displacement and vibration monitoring are required.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 21504-04-36-10-02 |
| Product Series | 7200 Series |
| Product Type | 8 mm Probe |
| Probe Type | Eddy Current Proximity Probe |
| Measurement Method | Non-Contact Displacement Measurement |
| Measurement Target | Conductive Rotating Shaft |
| Main Function | Shaft Displacement and Position Monitoring |
| Application | Machinery Vibration Monitoring |
| Probe Size | 8 mm Series |
| Total Length | 1 meter |
| Weight | 0.22 kg |
| Installation | Rotating Machinery Monitoring System |
| Application Area | Machinery Protection and Condition Monitoring |
Product Features
The Bently Nevada 21504-04-36-10-02 is designed for non-contact measurement of rotating shaft movement.
Key features include:
- 8 mm proximity probe configuration
- Eddy current sensing principle
- Non-contact shaft displacement measurement
- Suitable for rotating machinery
- Supports shaft vibration monitoring
- Supports relative shaft position measurement
- 1 meter total length
- Suitable for installations requiring additional probe reach
- Compact industrial sensing design
- Compatible with appropriate machinery monitoring equipment
The 1 meter configuration can simplify installations where a shorter probe assembly would not provide sufficient physical reach between the sensing location and associated system connection.
Working Principle
The 7200 Series probe uses an eddy current sensing principle to detect changes in the distance between the probe tip and a conductive target.
When the probe is positioned near a rotating shaft, the sensing tip establishes an electromagnetic field. The conductive shaft interacts with this field, and changes in the probe-to-shaft gap produce corresponding changes in the electrical characteristics of the sensing circuit.
The measurement process generally consists of:
- Establishing an electromagnetic field at the probe tip
- Detecting the conductive rotating shaft
- Monitoring changes in the probe-to-target gap
- Producing an electrical response related to shaft position
- Conditioning the signal through associated driver electronics
- Sending the measurement information to the monitoring system
Because the probe does not physically contact the shaft, it can continuously monitor shaft movement without introducing mechanical friction at the sensing point.
Role in Industrial Monitoring Systems
The 21504-04-36-10-02 serves as the sensing element within a complete proximity monitoring channel.
| Function | Description |
| Shaft Displacement Measurement | Detects relative movement between the probe and shaft |
| Vibration Monitoring | Provides shaft movement information for vibration analysis |
| Position Monitoring | Tracks changes in relative shaft position |
| Non-Contact Sensing | Measures shaft movement without physical contact |
| Condition Monitoring | Supplies data for evaluating machine operating condition |
| Protection Support | Provides measurement input to compatible protection equipment |
The probe provides the raw measurement signal. Analysis, alarm processing, and protection decisions are performed by the associated monitoring and protection equipment.
Industrial Applications
The 7200 Series 8 mm probe can be used in industrial applications where rotating shaft movement needs to be monitored continuously.
| Industry | Typical Applications |
| Power Generation | Turbine and generator monitoring |
| Oil & Gas | Compressor and turbine monitoring |
| Petrochemical | Pumps and rotating process equipment |
| Power Utilities | Critical rotating machinery protection |
| Manufacturing | High-speed rotating equipment |
| Mining | Large rotating machinery |
| Water Treatment | Pump and motor monitoring |
| Industrial Facilities | Continuous machinery condition monitoring |
For critical machinery, proximity probe measurements can be combined with vibration, speed, temperature, and process measurements to provide a broader assessment of equipment condition.
Installation and System Integration
The installation position of a proximity probe directly affects the quality of the resulting measurement. The probe must remain securely positioned relative to the monitored shaft during normal machine operation.
Recommended installation steps include:
- Verify the complete probe part number.
- Confirm compatibility with the associated driver and monitoring equipment.
- Install the probe at the designated measurement location.
- Establish the appropriate probe-to-shaft gap.
- Align the probe correctly with the shaft surface.
- Secure the mounting arrangement against vibration.
- Route the 1 meter assembly without excessive tension or sharp bends.
- Check the electrical connections.
- Verify the measurement signal during commissioning.
The mounting structure should be sufficiently rigid to prevent unwanted probe movement. Any movement of the probe itself can be interpreted as shaft displacement by the monitoring system.
Compatible System Components
The 21504-04-36-10-02 is normally integrated with several supporting components.
| Compatible Component | Function |
| Proximity Probe Driver | Powers and conditions the probe signal |
| Extension Cable | Provides additional connection length when required |
| Machinery Monitoring System | Processes and displays measurement information |
| Machinery Protection System | Evaluates machine operating conditions |
| Rotating Shaft | Provides the conductive measurement target |
| Probe Mounting Hardware | Maintains the probe position |
| Vibration Monitoring Equipment | Analyzes shaft movement and vibration |
The probe, driver, cable, and monitoring equipment should be treated as a complete measurement chain when designing or modifying a machinery monitoring system.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
| Bently Nevada 21504-04-36-10-02 | 7200 Series 8 mm Probe | 1 meter total length | Rotating machinery monitoring |
| Bently Nevada 21504-04-36-05-02 | 7200 Series 8 mm Probe | 0.5 meter total length | Compact machinery installations |
| Bently Nevada 21504-00-48-10-00 | 7200 Series 8 mm Probe | 1 meter total length | Shaft displacement monitoring |
| Bently Nevada 21504-00-52-10-02 | 7200 Series 8 mm Probe | 1 meter total length | Machinery vibration monitoring |
| Bently Nevada 7200 Series Probes | Eddy Current Probe | Non-contact shaft measurement | Machinery protection |
The 1 meter length is an important consideration when selecting a replacement. A shorter configuration may not provide the required installation reach, while a different probe configuration may have different electrical or mechanical characteristics. Compatibility should therefore be checked across the complete measurement system.
Key Advantages
- Provides non-contact shaft displacement measurement
- Suitable for rotating machinery condition monitoring
- Uses an eddy current sensing principle
- Supports shaft vibration and position monitoring
- 1 meter total length
- Provides practical installation reach
- No physical contact with the rotating shaft
- Suitable for continuous machinery monitoring
- Compact 8 mm probe configuration
- Suitable for compatible machinery protection systems
Technical FAQs
How does the 1 meter probe length affect machinery installation planning?
The 1 meter length provides greater physical reach between the sensing position and the associated connection point than shorter configurations. It can reduce the need for additional connection length in installations where the monitoring hardware is positioned farther from the probe mounting location.
What problems can occur if the probe is mounted too close to the shaft?
An excessively small probe gap can move the operating point outside the intended measurement range. It can also reduce the available displacement margin and make the measurement more sensitive to mechanical movement or installation tolerances.
Why is probe alignment important when measuring radial shaft vibration?
Radial vibration is measured relative to the direction of the probe. If the probe is not correctly aligned with the intended measurement axis, the resulting signal may not accurately represent the shaft movement being monitored and can complicate vibration analysis.
How should the 21504-04-36-10-02 be matched with a replacement driver?
The replacement driver should be selected according to the probe’s electrical characteristics, system configuration, required measurement range, cable arrangement, and monitoring equipment. Matching only the physical probe diameter or cable length is not sufficient to establish electrical compatibility.