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The Bently Nevada 330171-00-30-10-02-BR is a 3300 5 mm Proximity Probe used as the sensing element in a proximity measurement system for rotating machinery. It works with the associated proximity transducer system to detect shaft position and vibration without physical contact between the probe tip and the rotating shaft.
This type of probe is commonly installed on equipment such as steam turbines, gas turbines, compressors, pumps, motors, and other rotating machinery where shaft movement needs to be monitored continuously. A typical installation places the probe close to a prepared shaft surface. As the shaft moves relative to the probe, the electrical characteristics of the proximity system change, allowing the connected monitoring system to determine the shaft’s relative position or movement.
The 330171-00-30-10-02-BR belongs to the Bently Nevada 3300 XL 5 mm proximity probe family. Its 1-meter total length makes it suitable for installations where the sensing location and the associated extension/proximity electronics require a relatively short probe connection.
In a compressor monitoring application, for example, probes can be positioned near the shaft to monitor radial vibration or shaft position. Similar arrangements are used around turbine bearings to detect changes in rotor movement that may indicate developing mechanical conditions.
The probe is only one part of the complete measurement chain. The installation normally also involves a compatible proximity sensor system, extension cable, Proximitor Sensor, and monitoring system. Proper probe gap, target material, mounting, and cable routing all affect the final measurement.
For replacement work, the complete 330171-00-30-10-02-BR reference should be checked against the existing probe, including its thread arrangement, probe length, connector configuration, and compatibility with the installed 3300 monitoring system.
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 330171-00-30-10-02-BR |
| Product Family | 3300 XL 5 mm |
| Product Type | 3300 5 mm Proximity Probe |
| Probe Diameter | 5 mm |
| Measurement Type | Non-contact proximity measurement |
| Application | Rotating machinery shaft vibration and position monitoring |
| Sensing Principle | Eddy-current proximity measurement |
| Probe Construction | Shielded probe |
| Probe Connection | Compatible with the associated 3300 proximity measurement system |
| Total Length | 1 meter |
| Weight | 0.323 kg |
The 330171-00-30-10-02-BR operates as the sensing element of an eddy-current proximity measurement system.
Rotating Shaft → 330171 Probe → Proximitor Sensor → Monitoring System
The probe tip is positioned close to the conductive surface of the machine shaft without making physical contact. The associated proximity electronics generate a high-frequency electrical field at the probe tip. When the shaft moves closer to or farther away from the probe, the electrical response of the sensing circuit changes.
The Proximitor Sensor converts this change into an electrical output that represents the relative position of the shaft. A monitoring system can then use the signal to observe shaft vibration, radial movement, or shaft position depending on the measurement arrangement.
For example, two probes may be installed around a compressor shaft at approximately perpendicular orientations. Their signals can be processed together to observe radial shaft movement and identify changes in the rotor’s operating condition.
Probe installation is critical. The gap between the probe tip and shaft target must be set within the applicable operating range, and the shaft target surface needs to be suitable for eddy-current measurement. A damaged probe tip, incorrect gap, poor mounting, or unsuitable target surface can affect the measured signal even when the monitoring electronics are functioning normally.
The 330171-00-30-10-02-BR occupies the sensing position at the beginning of the proximity measurement chain.
Machine Shaft → 330171 Proximity Probe → Proximitor Sensor → Monitoring System → Machinery Protection / DCS
| System Element | Function |
|---|---|
| 330171-00-30-10-02-BR | Detects non-contact shaft movement |
| Proximitor Sensor | Supplies the probe system and converts the probe response into an output signal |
| Extension Cable | Connects the probe to the associated proximity electronics where required |
| Shaft Target | Provides the conductive machine surface detected by the probe |
| 3300 Monitoring System | Processes and monitors the proximity measurement |
| Machinery Protection System | Uses vibration or position information for protective functions |
| DCS / PLC | Receives relevant monitoring information for plant supervision |
| Rotating Machine | Provides the shaft movement being measured |
The actual arrangement depends on whether the probe is being used for radial vibration, axial position, phase reference, or another proximity measurement.
| Application | Typical Use |
|---|---|
| Steam Turbines | Monitoring rotor vibration and shaft movement |
| Gas Turbines | Measuring shaft movement around critical rotating assemblies |
| Centrifugal Compressors | Monitoring radial shaft vibration and position |
| Reciprocating Machinery | Monitoring applicable shaft or rotating-component movement |
| Pumps | Detecting changes in shaft movement and vibration |
| Motors | Monitoring rotor movement in critical machinery |
| Gearboxes | Monitoring selected rotating shafts |
| Industrial Fans | Condition monitoring of critical rotating assemblies |
| Power Generation Equipment | Continuous machinery protection and condition monitoring |
| Process Machinery | Monitoring rotating equipment connected to plant processes |
When troubleshooting a proximity channel, checking the probe gap and target surface early in the process can prevent unnecessary replacement of a functioning probe or Proximitor Sensor.
| Component | Function |
|---|---|
| Bently Nevada Proximitor Sensor | Provides the probe interface and processes the proximity signal |
| 3300 XL Extension Cable | Connects the probe to the associated Proximitor Sensor where required |
| Bently Nevada 3300 Monitoring System | Monitors the resulting vibration or shaft-position signal |
| Probe Mounting Hardware | Secures the proximity probe at the required measurement position |
| Rotating Shaft | Provides the conductive target for the proximity measurement |
| Machinery Protection System | Uses the measurement for alarm and protection functions |
| DCS / PLC Interface | Provides plant-level monitoring information |
| Bearing Housing | Provides the mechanical location for the probe installation |
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 330171 Series | 3300 XL 5 mm Proximity Probe | General shaft vibration and position measurement |
| Bently Nevada 330101 Series | 3300 XL 8 mm Proximity Probe | Proximity measurement requiring an 8 mm probe |
| Bently Nevada 3300 XL Proximitor Sensor | Proximity Signal Conditioner | Interface between probe and monitoring system |
| Bently Nevada 3300 XL Extension Cable | Extension Cable | Connecting compatible proximity probes to Proximitor Sensors |
| Bently Nevada 3300 System | Machinery Monitoring System | Continuous vibration and machinery protection applications |
| Bently Nevada 3300 XL 5 mm | Proximity Measurement Family | Compact proximity measurement on rotating machinery |
The 5 mm designation refers to the nominal probe diameter and identifies the probe within the Bently Nevada 3300 XL 5 mm proximity probe family. It is not the measurement range or the recommended probe gap.
Normally, the probe is part of a complete proximity measurement chain and works with compatible Bently Nevada proximity electronics. The Proximitor Sensor provides the appropriate interface and output signal before the measurement is sent to a monitoring or control system.
The proximity system determines shaft position from the electrical response between the probe tip and the conductive shaft target. An incorrect gap can shift the operating point or produce an abnormal signal, so the installation gap needs to be set correctly during commissioning.
Check the complete model reference, probe diameter and length, mounting arrangement, connector configuration, extension cable, Proximitor Sensor, and monitoring channel. The shaft target condition and installed probe gap should also be checked because an apparent probe fault can sometimes originate from the mechanical installation rather than the probe itself.