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- Bently Nevada
- 22811-00-25-05-02
- Proximity Probe
- USA
- 8 mm
- 0.59 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 22811-00-25-05-02 7200 Series 8 mm Proximity Probe is a non-contact displacement sensing component used in rotating machinery monitoring systems. It detects changes in the relative position between the probe and a conductive shaft target, allowing machinery monitoring equipment to evaluate shaft movement and vibration-related conditions.
The probe is suitable for installations where continuous observation of rotating shafts is required without physical contact between the sensor and the machine surface. This makes the 7200 Series applicable to machinery such as turbines, compressors, pumps, motors, generators, and other rotating equipment where shaft position and movement are important operating parameters.
The probe normally works together with compatible proximity signal-conditioning electronics. The sensor establishes the measurement point at the machine, while the associated electronics process the probe response and deliver a usable signal to the machinery monitoring or protection system.
For replacement work, the complete part number 22811-00-25-05-02 should be matched with the installed system. Probe configuration, cable arrangement, mounting method, associated electronics, and installation gap should be checked before replacing an existing sensor.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 22811-00-25-05-02 |
| Product Family | Bently Nevada 7200 Series |
| Product Type | 8 mm Proximity Probe |
| Manufacturer | Bently Nevada |
| Sensing Principle | Non-Contact Proximity Measurement |
| System Role | Rotating Machinery Displacement Monitoring |
| Primary Function | Shaft Position and Movement Measurement |
| Typical Application | Turbine, Compressor, Pump, Motor and Generator Monitoring |
| Diameter | 8 mm |
| Weight | 0.59 kg |
Product Features
- Non-contact sensing of rotating shaft movement.
- Part of the Bently Nevada 7200 Series.
- 8 mm proximity probe configuration.
- Suitable for shaft displacement monitoring.
- Can be used for vibration-related machinery monitoring.
- Operates without direct mechanical contact with the rotating target.
- Suitable for continuous machinery monitoring systems.
- Works with compatible proximity signal-conditioning electronics.
- Applicable to critical rotating equipment.
- Supports machinery protection and condition monitoring architectures.
- Suitable for maintenance and replacement of compatible 7200 Series installations.
- Requires correct probe positioning and system compatibility for accurate measurement.
Working Principle
The 22811-00-25-05-02 measures the relative distance between the probe tip and the conductive target on the rotating shaft. As the shaft moves, the electrical response of the proximity sensing circuit changes accordingly.
The associated signal-conditioning electronics convert the sensor response into a measurement signal that can be interpreted by the machinery monitoring system. Changes in shaft position or dynamic movement can then be evaluated against configured operating and protection limits.
Rotating Shaft → 22811-00-25-05-02 Probe → Proximity Electronics → Monitoring System → Alarm / Protection
The mechanical installation directly affects measurement quality. The probe must be correctly positioned relative to the shaft target, with appropriate alignment and installation gap maintained throughout machine operation.
Role in a Machinery Protection Control Architecture
The proximity probe forms the sensing interface between the rotating machine and the electronic monitoring system. It provides the initial measurement of shaft movement before the signal is conditioned and evaluated by downstream equipment.
Rotating Machine → Proximity Probe → Signal Conditioning → Machinery Monitor → Protection Logic → Alarm / Trip
| System Element | Function |
|---|---|
| Rotating Shaft | Provides the monitored mechanical target |
| 22811-00-25-05-02 | Detects relative shaft movement |
| Proximity Electronics | Conditions the probe signal |
| Machinery Monitor | Processes and evaluates the measurement |
| Protection Logic | Determines alarm or shutdown conditions |
| Alarm System | Reports abnormal machine behavior |
| Trip System | Initiates protective action when required |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Shaft position and vibration monitoring |
| Gas Turbines | Rotor movement monitoring |
| Compressors | Shaft displacement monitoring |
| Pumps | Rotating shaft condition monitoring |
| Generators | Rotor movement supervision |
| Large Motors | Shaft monitoring and protection |
| Expanders | High-speed rotating machinery monitoring |
| Industrial Turbomachinery | Continuous machinery protection |
| Process Plants | Critical equipment condition monitoring |
| Power Generation | Turbine and generator protection |
Installation and Maintenance
- Verify the complete 22811-00-25-05-02 part number before installation.
- Confirm compatibility with the existing 7200 Series monitoring system.
- Isolate the rotating equipment before performing probe installation or replacement.
- Inspect the probe tip and housing for mechanical damage.
- Verify that the mounting arrangement is suitable for the replacement probe.
- Position the probe correctly relative to the monitored shaft target.
- Set the probe-to-target gap according to the requirements of the associated system.
- Maintain proper probe alignment throughout the installation.
- Inspect cable routing and prevent excessive mechanical stress on the cable.
- Check all electrical connections and terminations before commissioning.
- Verify the proximity signal under stationary and operating conditions as applicable.
- Investigate unstable or abnormal readings by checking the probe, cable, target surface, installation gap, and signal-conditioning electronics.
Related Components
| Component | Function |
|---|---|
| Bently Nevada 7200 Series Proximity Electronics | Processes the proximity probe signal |
| Proximity Signal Conditioner | Converts the probe response into a usable signal |
| Machinery Monitoring System | Evaluates shaft movement and vibration |
| Rotating Shaft | Provides the measurement target |
| Probe Mounting Hardware | Maintains probe position |
| Extension Cable | Provides the required connection where applicable |
| Monitoring Rack | Houses compatible monitoring electronics |
| Alarm System | Indicates abnormal machinery conditions |
| Shutdown System | Provides protective machine shutdown |
| Machine Control System | Coordinates machinery operation |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 7200 Series | Proximity Monitoring System | Rotating machinery monitoring |
| Bently Nevada 7200 Series 8 mm Proximity Probe | Proximity Probe | Shaft displacement measurement |
| Bently Nevada 3300 XL 8 mm | Proximity Probe System | Shaft vibration and position monitoring |
| Bently Nevada 3300 XL | Machinery Monitoring System | Critical rotating machinery monitoring |
| Bently Nevada 3300 XL Proximitor | Signal Conditioning Module | Proximity signal processing |
| Bently Nevada 3500 | Machinery Protection System | Critical machinery protection |
| Bently Nevada 3500/40M | Proximity / Position Monitor | Shaft position and vibration monitoring |
| Bently Nevada 1900/65A | Machinery Protection Monitor | General machinery monitoring |
| Bently Nevada Extension Cable | Probe Extension Cable | Probe-to-electronics connection |
| Bently Nevada Proximity Probe Systems | Proximity Measurement System | Rotating equipment monitoring |
Key Advantages
- Provides non-contact shaft movement measurement.
- Suitable for continuous rotating machinery monitoring.
- Compact 8 mm probe configuration.
- Compatible with suitable 7200 Series proximity monitoring arrangements.
- Supports machinery protection and condition monitoring applications.
- Suitable for turbines, compressors, pumps, generators, and motors.
- Useful for replacement and maintenance of existing proximity probe installations.
Technical FAQs
What is the main difference between a proximity probe and a vibration sensor that uses physical contact?
A proximity probe measures shaft movement without physically contacting the rotating shaft. It can therefore detect relative shaft displacement directly while avoiding mechanical wear at the sensing point.
How important is the probe installation gap for the 22811-00-25-05-02?
The installation gap is critical because the proximity system interprets changes in the electrical response as changes in target distance. An incorrect gap can shift the operating point or produce an unsuitable measurement signal, so the gap must be established according to the associated electronics and application requirements.
Why might a newly installed probe produce an unstable signal?
An unstable signal can result from incorrect probe positioning, poor alignment, unsuitable target conditions, damaged cabling, loose connections, electrical interference, or problems with the associated signal-conditioning electronics. The complete measurement chain should be checked rather than immediately assuming the probe has failed.
Should the 22811-00-25-05-02 be replaced with another 7200 Series probe solely because it has the same diameter?
No. The diameter alone does not establish full compatibility. The complete part number and probe configuration should be compared, along with the associated electronics, cable arrangement, mounting requirements, and application characteristics.