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- Bently Nevada
- 21504-12-28-10-02
- 7200 Series 8 mm Probe
- USA
- 1 meter
- 0.22 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 21504-12-28-10-02 7200 Series 8 mm Probe is a non-contact displacement sensor used in machinery condition monitoring and vibration measurement systems. It belongs to the 7200 Series and is designed to work with compatible proximity monitoring equipment to detect changes in the position of a rotating shaft or other conductive machine target.
In rotating equipment, shaft displacement can provide important information about machine operating conditions. The probe generates a sensing field around its active tip, and changes in the distance between the probe and the target produce corresponding changes in the electrical signal. The monitoring system can then use this information to evaluate shaft movement, vibration, and other mechanical conditions.
The probe is commonly associated with machinery such as turbines, compressors, pumps, motors, and other rotating equipment where continuous condition monitoring is required.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 21504-12-28-10-02 |
| Product Type | 7200 Series 8 mm Probe |
| Series | 7200 Series |
| Sensor Type | Non-Contact Displacement Probe |
| Probe Diameter | 8 mm |
| Main Function | Shaft Displacement and Vibration Measurement |
| Measurement Principle | Eddy Current / Proximity Sensing |
| Application | Rotating Machinery Monitoring |
| Total Length | 1 meter |
| Weight | 0.22 kg |
| Typical Application | Turbines, Compressors, Pumps, Motors and Rotating Equipment |
Product Features
The 21504-12-28-10-02 is designed for continuous monitoring of rotating machinery where accurate shaft-position information is required.
Key characteristics include:
- Bently Nevada 7200 Series design
- 8 mm probe configuration
- Non-contact measurement
- Designed for shaft displacement monitoring
- Suitable for vibration monitoring applications
- Measures changes in the distance between the probe and target
- Designed for use with compatible proximity monitoring electronics
- Total length of 1 meter
- Stated weight of 0.22 kg
- Suitable for industrial rotating machinery
Because the probe operates without physically contacting the rotating shaft, it can continuously monitor shaft movement without introducing mechanical wear at the sensing point.
Working Principle
The 7200 Series probe operates using a non-contact proximity sensing principle.
A simplified measurement chain is:
Probe → Proximity Electronics → Monitoring System → Machine Protection / Condition Monitoring
The probe is positioned close to a conductive target, typically a rotating shaft. When the shaft moves relative to the probe tip, the electrical characteristics of the sensing field change.
The associated proximity electronics convert this change into a usable electrical signal. The monitoring system can then analyze the signal to determine shaft displacement, vibration amplitude, or changes in the shaft’s operating position.
This arrangement allows the sensor to monitor a rotating shaft without requiring physical contact.
Role in Machinery Condition Monitoring
The 21504-12-28-10-02 is used as the sensing element within a larger machinery monitoring system.
| Function | Description |
|---|---|
| Shaft Position Monitoring | Detects changes in shaft position relative to the probe |
| Vibration Measurement | Provides displacement information for vibration analysis |
| Non-Contact Sensing | Measures the target without mechanical contact |
| Continuous Monitoring | Supports ongoing machinery condition observation |
| Fault Detection | Helps identify abnormal shaft movement |
| Machinery Protection | Provides measurement information to monitoring systems |
The probe itself provides the physical measurement interface. Signal conditioning and analysis are performed by the associated monitoring electronics.
Industrial Applications
The 7200 Series probe is suitable for applications where rotating shaft movement needs to be monitored.
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft vibration and displacement monitoring |
| Gas Turbines | Rotating shaft condition monitoring |
| Compressors | Shaft movement and vibration measurement |
| Pumps | Monitoring rotating equipment |
| Motors | Shaft vibration detection |
| Generators | Rotor condition monitoring |
| Industrial Machinery | Continuous machinery condition monitoring |
| Rotating Equipment | Predictive maintenance systems |
The exact installation depends on the machine geometry, target material, required measurement point, and associated monitoring electronics.
Installation and Maintenance
Correct probe installation is important because the distance between the probe tip and the monitored target directly affects the measurement signal.
Before installation, verify the probe model, mounting arrangement, cable routing, and compatibility with the associated proximity electronics.
Recommended practices include:
- Confirm the complete 21504-12-28-10-02 part number.
- Verify compatibility with the existing monitoring system.
- Inspect the probe tip for physical damage.
- Check the cable and connector for damage.
- Install the probe securely.
- Maintain the appropriate probe-to-target clearance.
- Ensure the probe is correctly aligned with the shaft target.
- Keep the cable away from excessive mechanical stress.
- Avoid sharp bends or unnecessary strain on the cable.
- Check the signal after installation.
- Verify the measurement against expected machine conditions.
Probe positioning should be treated as an important part of the measurement system. An incorrectly installed probe can produce unstable or inaccurate readings even when the sensor itself is functioning normally.
Related Components
The probe normally works together with several other parts of a machinery monitoring system.
| Component | Function |
|---|---|
| 7200 Series Probe | Detects shaft displacement |
| Proximity Electronics | Conditions the probe signal |
| Monitoring Module | Processes and evaluates measurement data |
| Vibration Monitor | Displays and analyzes vibration information |
| Machine Protection System | Generates alarms or protective actions |
| Shaft Target | Conductive surface being monitored |
| Extension Cable | Connects the probe to associated electronics |
The probe should therefore be selected together with the compatible monitoring electronics and installation hardware.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Bently Nevada 21504-12-28-10-02 | 8 mm Probe | Shaft displacement measurement | Rotating machinery |
| Bently Nevada 21504-00-48-10-00 | 7200 Series 8 mm Probe | Non-contact displacement sensing | Machinery monitoring |
| Bently Nevada 21504-00-52-10-02 | 7200 Series 8 mm Probe | Shaft vibration and displacement measurement | Rotating equipment |
| Bently Nevada 21504-04-36-10-02 | 7200 Series 8 mm Probe | Non-contact shaft monitoring | Industrial machinery |
| Bently Nevada 7200 Series | Probe Family | Machinery displacement measurement | Turbines and rotating equipment |
When selecting a replacement probe, the complete part number should be matched. Probe diameter, length, connector arrangement, cable configuration, mounting requirements, and compatibility with the associated proximity electronics should all be considered.
Key Advantages
- 7200 Series 8 mm probe design
- Non-contact shaft displacement measurement
- Suitable for rotating machinery condition monitoring
- Supports vibration measurement
- Designed for continuous machinery monitoring
- Can be integrated with compatible monitoring electronics
- Total length of 1 meter
- Stated weight of 0.22 kg
- Suitable for turbines, compressors, pumps, motors, and other rotating equipment
Technical FAQs
What does the Bently Nevada 21504-12-28-10-02 measure?
The probe is designed to detect changes in the relative position between the probe tip and a conductive machine target, typically a rotating shaft. The resulting signal can be used for shaft displacement and vibration monitoring.
Why is non-contact measurement useful for rotating machinery?
A non-contact probe can monitor shaft movement without physically touching the rotating component. This allows continuous measurement while avoiding mechanical contact between the sensor tip and the shaft.
What is the importance of the probe-to-shaft gap?
The distance between the probe tip and the target directly affects the sensor’s electrical output. The probe therefore needs to be installed at the appropriate clearance and aligned correctly with the monitored shaft.
Can the 21504-12-28-10-02 be connected directly to a PLC?
The probe normally works as part of a proximity measurement system rather than acting as a conventional standalone PLC sensor. Compatible signal-conditioning or proximity electronics are generally required to convert the probe’s output into a suitable monitoring signal.
What should be checked if the probe signal becomes unstable?
The probe tip, cable, connector, mounting position, probe-to-target clearance, shaft condition, and associated proximity electronics should all be inspected. Mechanical vibration or incorrect installation can also affect the measured signal.
Why is the exact probe part number important when replacing a 7200 Series probe?
Different probes can have different lengths, cable arrangements, connectors, mounting configurations, and electrical characteristics. Matching the complete part number helps ensure compatibility with the existing monitoring system.