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- Bently Nevada
- 30000-00-08-18-02
- Proximity Probe
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Product Overview
The Bently Nevada 30000-00-08-18-02 is an 8 mm proximity probe used in non-contact measurement systems for rotating machinery. It belongs to the 30000 Series and uses eddy-current sensing technology to detect changes in the distance between the probe tip and a conductive target. In suitable installations, these measurements support shaft vibration and relative position monitoring in compressors, turbines, pumps, and other rotating equipment.
Unlike a contact sensor, the proximity probe measures shaft movement without physically touching the monitored surface. The probe is installed near the shaft with a controlled sensing gap, allowing it to detect small changes in relative position during machine operation. The resulting electrical signal is processed by a compatible Proximitor or signal-conditioning device before being passed to the machinery monitoring system.
The 30000-00-08-18-02 configuration incorporates an 8 mm sensing tip and an 18-foot cable-length option. The threaded case configuration supports installation in a suitable probe mounting arrangement, such as a bearing housing or another designated measurement location. The exact mounting arrangement depends on the machinery design and the required measurement point.
In a centrifugal compressor, for example, a proximity probe can monitor shaft movement near a bearing. Changes in the measured gap may reflect shaft vibration, rotor displacement, or changes in the mechanical condition of the machine. When combined with other measurements and operating information, these signals help maintenance personnel investigate imbalance, misalignment, bearing problems, and other developing faults.
The probe is only one part of the complete measurement system. Its electrical characteristics must be compatible with the associated extension cable, Proximitor, and monitoring equipment. The complete assembly determines the measurement response, so selecting a probe based solely on its sensing-tip diameter or connector appearance is insufficient.
The 30000-00-08-18-02 is particularly relevant to maintenance work on existing machinery monitoring installations that require the corresponding probe configuration. It can serve as a replacement component when the installed system calls for this specific reference, or as part of a compatible transducer arrangement in a new installation.
Probe installation also affects measurement quality. The sensing tip must face the intended conductive target, the mounting must maintain the required clearance, and the cable must be routed without damaging the probe or its electrical connection. Incorrect positioning, unsuitable cable configuration, or an incompatible signal-conditioning device can produce misleading readings even when the probe itself is functional.
For machinery operating continuously, the probe provides a measurement point that can feed into the plant’s existing monitoring and diagnostic workflow. Its role is to detect displacement-related changes; interpreting those changes and deciding whether an alarm or protective response is required remain functions of the connected monitoring system and its configured logic.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 30000-00-08-18-02 |
| Product Series | 30000 Series |
| Product Type | Proximity Probe |
| Sensing Technology | Eddy-current proximity sensing |
| Probe Tip Diameter | 8 mm |
| Threaded Case Length Option | 0.8 inch |
| Cable Length Option | 18 feet |
| Connector Configuration | Integral miniature coaxial connector |
| Primary Function | Non-contact displacement measurement |
| Typical Measurement Applications | Shaft vibration and relative shaft position |
| Total Length | Optional |
| Shipping Weight | 3 kg |
Product Features
- 8 mm sensing tip: Supports non-contact measurement of a conductive target in compatible proximity transducer systems.
- Eddy-current measurement principle: Detects changes in the probe-to-target gap through variations in the sensing circuit.
- 18-foot cable configuration: Supports installations requiring the specified integrated cable option.
- Threaded mounting arrangement: Allows installation in a compatible threaded probe holder or machine mounting location.
- Rotating machinery monitoring: Supports shaft vibration and relative position measurement applications.
- Signal-conditioning compatibility: Operates as part of a complete probe, cable, and Proximitor arrangement.
- Non-contact operation: Measures shaft movement without requiring the probe tip to touch the monitored surface.
- Maintenance replacement use: Provides a model-specific replacement option for compatible existing installations.
- Continuous measurement capability: Supports machinery monitoring while the connected measurement system is operating within its specified conditions.
Working Principle
The 30000-00-08-18-02 uses eddy-current sensing to detect changes in the gap between its sensing tip and a conductive target. The probe operates as part of an electrical measurement circuit, with the associated Proximitor supplying the excitation and processing the probe response.
Conductive Shaft Surface → Proximity Probe → Compatible Proximitor → Machinery Monitoring System
When the probe is positioned near a conductive shaft, its electromagnetic field interacts with the target surface. Changes in the distance between the probe tip and the shaft alter the electrical response of the sensing circuit. The Proximitor converts this response into a signal suitable for the connected monitoring equipment.
During normal machine operation, shaft movement changes the measured gap. The resulting signal can contain information about static shaft position and dynamic movement, depending on the probe installation and the capabilities of the complete transducer system.
For vibration monitoring, the probe is commonly installed near a shaft supported by fluid-film bearings. As the shaft moves relative to the bearing structure, the measured gap changes. The monitoring equipment can evaluate this signal to determine vibration amplitude and other supported parameters.
The probe can also be used in suitable position-measurement arrangements. In these applications, the measurement system evaluates the gap or changes in relative position rather than treating the signal solely as vibration data. The actual measurement function depends on the probe location, mechanical arrangement, and connected monitoring channels.
Cable configuration is an important part of the working principle. The probe, cable, and Proximitor form a matched electrical system. Their combined characteristics influence the signal response, so the specified cable-length arrangement must be maintained when selecting a replacement component.
The probe does not independently calculate vibration severity or generate machinery shutdown commands. It supplies the sensing response to the associated electronics, while the monitoring system performs measurement processing, display, alarm evaluation, and any configured protection actions.
When the measured signal becomes unstable, troubleshooting should include the probe gap, mounting condition, connector integrity, cable routing, and Proximitor compatibility. Mechanical movement of the probe holder or damage to the cable can affect the measurement even if the monitored shaft has not developed a corresponding fault.
Role in the Machinery Monitoring Architecture
The Bently Nevada 30000-00-08-18-02 provides the sensing point in a proximity measurement channel. It detects changes in the gap between the probe tip and the target, while the connected electronics process the signal and make it available to the machinery monitoring system.
Rotating Shaft → 30000-00-08-18-02 Probe → Proximitor → Monitoring Channel → Plant Monitoring System
| System Component | Function |
|---|---|
| Bently Nevada 30000-00-08-18-02 | Detects changes in the distance between the probe tip and conductive target |
| Probe Mounting Hardware | Holds the probe in the required position relative to the target |
| Compatible Extension Cable, Where Required | Connects the probe to the associated signal-conditioning equipment |
| Proximitor | Supplies the required excitation and processes the probe response |
| Machinery Monitoring Module | Receives and evaluates the conditioned measurement signal |
| Bearing Assembly | Supports the shaft and establishes the mechanical reference for relative movement |
| Rotating Shaft | Provides the conductive target for proximity measurement |
| Monitoring Software | Displays and analyzes measurements supplied by compatible monitoring equipment |
| Machinery Protection System | Applies configured alarms and protective actions through the appropriate monitoring architecture |
Industrial Applications
| Application | Typical Use |
|---|---|
| Centrifugal Compressors | Monitoring shaft vibration and relative position near bearing locations |
| Steam Turbines | Measuring shaft movement as part of a compatible machinery monitoring arrangement |
| Gas Turbines | Supporting non-contact displacement measurement at designated shaft locations |
| Industrial Pumps | Monitoring shaft movement in suitable bearing and probe installations |
| Power Generation Equipment | Providing proximity measurements for rotating machinery condition assessment |
| Petrochemical Plants | Maintaining probe channels used in continuous compressor and pump monitoring |
| Refinery Machinery | Supporting shaft vibration and position measurement on critical rotating assets |
| Gearboxes | Measuring relative movement where the probe arrangement and target are suitable |
| Industrial Process Machinery | Providing displacement-related signals to compatible monitoring equipment |
| Machinery Maintenance Programs | Replacing an existing probe when the installed transducer configuration requires this reference |
Installation and Maintenance
- Verify the probe reference: Confirm that the required component is Bently Nevada 30000-00-08-18-02 and that the installed measurement channel uses the corresponding configuration.
- Inspect the mounting location: Check the probe holder, mounting threads, and surrounding mechanical structure for damage or contamination.
- Prepare the equipment safely: Follow the site’s machinery isolation and maintenance procedures before working near rotating components.
- Check the sensing target: Confirm that the intended target is suitable for eddy-current measurement and that the probe faces the correct surface.
- Position the probe correctly: Establish the required probe-to-target gap using the applicable installation procedure and measurement-system requirements.
- Secure the mounting arrangement: Install the probe without damaging its threaded case or applying excessive force to the sensing assembly.
- Route the cable carefully: Prevent crushing, sharp bending, abrasion, and contact with hot or moving machine components.
- Inspect the connector: Check the electrical connection for contamination, damage, and secure engagement with the compatible cable or signal-conditioning device.
- Verify system compatibility: Confirm that the probe, cable arrangement, and Proximitor form a compatible transducer system.
- Check the electrical response: Use the applicable commissioning procedure to verify the gap voltage and measurement signal.
- Evaluate the monitoring channel: Confirm that the connected monitoring equipment receives a plausible signal and that the displayed measurement responds appropriately to controlled shaft movement where applicable.
- Record maintenance results: Document the probe reference, installation details, measurement checks, and any abnormalities identified during commissioning.
If the signal remains unstable after installation, investigate the mounting condition, target surface, cable, connector, and associated Proximitor before concluding that the probe itself is defective.
Related Components
| Component | Function |
|---|---|
| Bently Nevada 30000-00-08-18-02 | Proximity probe for compatible non-contact displacement measurement |
| Bently Nevada Proximitor | Supplies the probe excitation and processes the sensing response |
| Compatible Extension Cable | Connects the probe to the associated signal-conditioning device where required |
| Probe Mounting Bracket | Maintains the required probe position relative to the monitored target |
| Machinery Monitoring Module | Receives and evaluates the conditioned probe signal |
| Bently Nevada 3300 Series Monitoring Equipment | Provides compatible machinery monitoring functions in supported configurations |
| Bently Nevada 3500 Series Monitoring System | Processes compatible transducer signals through the appropriate monitoring modules |
| Machinery Monitoring Software | Supports measurement display, trend review, and diagnostic analysis |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 30000-00-08-18-02 | Proximity Probe | Model-specific replacement in a compatible 30000 Series installation |
| Bently Nevada 3300 XL 8 mm Proximity Probe | Proximity Probe | Shaft vibration and position measurement in compatible 3300 XL transducer systems |
| Bently Nevada 3300 XL 8 mm Extension Cable | Extension Cable | Probe-to-Proximitor connection in compatible 3300 XL systems |
| Bently Nevada 3300 XL 8 mm Proximitor Sensor | Signal-Conditioning Sensor | Processing compatible 3300 XL 8 mm probe signals |
| Bently Nevada 3500 Series | Machinery Protection System | Monitoring supported vibration, position, and other machinery parameters |
Key Advantages
- Provides non-contact sensing for compatible shaft vibration and position measurements.
- Uses an 8 mm probe tip for suitable proximity measurement installations.
- Supports integration with compatible signal-conditioning and machinery monitoring equipment.
- Can serve as a replacement component in an existing installation requiring the specified model.
- Supports continuous machinery condition monitoring when installed as part of a compatible transducer system.
Technical FAQs
What does the 08 designation indicate in the model number?
In this model configuration, the 08 option identifies a 0.8-inch threaded case length. It is a mounting-related option rather than the sensing-tip diameter or the overall length of the complete probe assembly.
What does the 18 designation represent?
The 18 option identifies the 18-foot cable-length configuration. Cable length is relevant to the electrical characteristics of the complete proximity transducer system, so the probe must be used with compatible signal-conditioning equipment and the intended cable arrangement.
Can this probe be connected directly to a PLC analog input?
Not as a direct substitute for a conventional voltage or current transmitter. The probe operates as part of a proximity transducer circuit and requires compatible signal-conditioning electronics. A PLC can receive the resulting measurement through a suitable monitoring module or signal interface.
What should be investigated if the probe signal changes after maintenance?
Check whether the probe mounting position or sensing gap has changed, whether the connector is secure, and whether the cable or signal-conditioning device has been disturbed. A change in the measurement can result from installation conditions as well as actual shaft movement, so the complete measurement channel should be assessed.