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- Bently Nevada
- 21505-000-012-05-02
- 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 21505-000-012-05-02 7200 Series Proximity Probe is a non-contact proximity sensor designed for monitoring the position and movement of rotating machinery components. It is part of the Bently Nevada 7200 Series and is used in machinery condition-monitoring systems where shaft displacement and vibration information are important.
The probe is installed close to a conductive machine target, typically a rotating shaft. As the distance between the probe tip and the target changes, the electrical response of the sensing system changes accordingly. Compatible proximity electronics process this signal and provide measurement information to the machinery monitoring system.
This type of sensing arrangement is useful for continuously monitoring critical rotating equipment, helping maintenance personnel identify changes in shaft behavior before they develop into more serious mechanical problems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 21505-000-012-05-02 |
| 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 21505-000-012-05-02 is designed for non-contact monitoring of rotating machinery.
Key characteristics include:
- Bently Nevada 7200 Series design
- Non-contact proximity measurement
- Suitable for shaft displacement monitoring
- Supports vibration monitoring applications
- Designed for use with compatible proximity electronics
- Suitable for continuous machinery monitoring
- Total length of 0.5 meters
- Stated weight of 0.22 kg
- Suitable for industrial rotating equipment
The non-contact sensing method allows the probe to monitor a rotating shaft without physical contact between the sensor and the moving component.
Working Principle
The probe operates by detecting 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
The probe is mounted at a controlled distance from the shaft or other conductive target. When the target moves, the sensing characteristics change. The associated proximity electronics convert these changes into an electrical signal suitable for monitoring.
The monitoring system can then use the signal to evaluate shaft displacement, vibration behavior, and changes in the operating condition of the rotating machine.
This approach provides continuous measurement without requiring mechanical contact with the shaft.
Role in Machinery Condition Monitoring
The 21505-000-012-05-02 serves as the physical sensing element in a rotating machinery monitoring system.
| Function | Description |
|---|---|
| Shaft Displacement Monitoring | Detects relative movement between probe and shaft |
| Vibration Monitoring | Provides displacement information for vibration analysis |
| Non-Contact Sensing | Measures rotating targets without physical contact |
| Continuous Monitoring | Supports ongoing machine condition observation |
| Condition Detection | Helps identify abnormal shaft movement |
| Protection Support | Provides measurement data to machinery protection systems |
The probe does not normally perform signal analysis by itself. The associated proximity electronics and monitoring equipment perform the signal conditioning, processing, alarming, and protection functions.
Industrial Applications
The 7200 Series proximity probe can be used in a range of rotating machinery applications.
| 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 machinery monitoring |
The actual installation arrangement depends on the machine design, target material, measurement location, and associated monitoring equipment.
Installation and Maintenance
Correct installation is essential for reliable proximity measurements. The probe-to-target distance and alignment should be established according to the requirements of the monitoring system.
Before installation or replacement, verify the complete part number and compatibility with the associated proximity electronics.
Recommended checks include:
- Confirm the complete 21505-000-012-05-02 part number.
- Verify compatibility with the existing monitoring system.
- Inspect the probe tip for damage or contamination.
- Check the cable and connector for physical damage.
- Install the probe securely.
- Maintain the required probe-to-target clearance.
- Ensure proper alignment with the monitored shaft.
- Avoid excessive cable tension or sharp bending.
- Keep the cable away from sources of excessive mechanical or thermal stress.
- Verify the sensor signal after installation.
- Compare the measurement with expected machine operating conditions.
If the probe produces an abnormal signal, inspect the installation and associated electronics before assuming that the probe itself has failed.
Related Components
The probe normally forms part of a complete proximity monitoring system.
| Component | Function |
|---|---|
| 7200 Series Proximity Probe | Detects shaft movement |
| 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 Cable | Provides connection between sensing and electronic equipment |
The compatibility between the probe and its associated electronics should be confirmed when selecting replacement components.
Recommended Related Models
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Bently Nevada 21505-000-012-05-02 | 7200 Series Proximity Probe | Shaft displacement monitoring | Rotating machinery |
| Bently Nevada 21504-12-28-10-02 | 7200 Series 8 mm Probe | Non-contact displacement sensing | Machinery monitoring |
| Bently Nevada 21504-12-32-10-02 | 7200 Series 8 mm Probe | Shaft vibration and displacement measurement | Rotating equipment |
| Bently Nevada 21504-00-52-10-02 | 7200 Series 8 mm Probe | Non-contact shaft monitoring | Industrial machinery |
| Bently Nevada 7200 Series | Proximity Probe Family | Rotating machinery monitoring | Turbines and rotating equipment |
When selecting a replacement, the complete probe part number should be verified. Cable length, connector arrangement, probe configuration, mounting requirements, and compatibility with the existing proximity electronics should all be considered.
Key Advantages
- 7200 Series proximity probe design
- Non-contact shaft monitoring
- Suitable for displacement measurement
- Supports rotating machinery vibration monitoring
- Designed for continuous condition monitoring
- Works with compatible proximity electronics
- Suitable for critical industrial rotating equipment
- Total length of 0.5 meters
- Stated weight of 0.22 kg
Technical FAQs
What is the primary purpose of the 21505-000-012-05-02 probe?
Its primary purpose is to provide non-contact measurement of the relative movement between the probe and a conductive machine target, typically a rotating shaft. The resulting signal can be used for shaft displacement and vibration monitoring.
Why is the 0.5-meter probe length important during replacement?
Cable or overall probe length affects the physical installation arrangement. A replacement should have a compatible length and connection configuration so that it can be installed correctly without excessive cable tension or unsuitable routing.
Does the proximity probe physically touch the rotating shaft?
No. The probe is designed for non-contact measurement. It is installed with a controlled clearance from the monitored conductive target.
What can cause unstable readings from a proximity probe?
Incorrect probe clearance, poor alignment, damaged cables, connector problems, shaft movement, target-surface conditions, electrical interference, or problems in the associated proximity electronics can all contribute to unstable measurements.
Why must the probe be matched with compatible proximity electronics?
The probe and its associated electronics form a measurement system. Electrical characteristics and signal-conditioning requirements must be compatible for the monitoring system to receive an accurate and usable measurement.
What should be checked before replacing the probe?
The complete part number, probe configuration, cable length, connector arrangement, mounting requirements, proximity electronics, and existing installation should be checked. It is also useful to determine whether the original problem was caused by the probe or by another part of the monitoring system.