Introduction
The Bently Nevada 330105-02-12-10-12-RU is a 3300 XL 8 mm Reverse Mount Probe developed for non-contact measurement of shaft vibration and position in rotating machinery. Its reverse-mount construction provides a practical solution for machinery where the probe must be installed from the inside or rear side of the mounting arrangement rather than through a conventional front-mounted configuration.
This model combines a 3/8-24 UNF threaded body, 0.2-inch unthreaded length, 1.2-inch case length, 1.0-meter integral cable, FluidLoc cable construction, and RU certification configuration. The FluidLoc option is especially useful where the cable may be exposed to lubricating oil or other fluids and additional resistance to fluid migration is desirable.
As part of a properly configured 3300 XL proximity measurement system, the probe works with a compatible extension cable and Proximitor Sensor. The resulting measurement chain provides non-contact monitoring of shaft displacement, vibration, and related machinery behavior. With its reverse-mount format and FluidLoc protection, the 330105-02-12-10-12-RU is a strong fit for demanding turbomachinery installations where mounting access and environmental conditions both need to be considered.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330105-02-12-10-12-RU |
| Product Family | 3300 XL |
| Product Type | 8 mm Reverse Mount Probe |
| Measurement Principle | Eddy-current proximity measurement |
| Mounting Type | Reverse Mount |
| Thread | 3/8-24 UNF |
| Unthreaded Length | 0.2 in (5.08 mm) |
| Case Length | 1.2 in (30.48 mm) |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Cable Configuration | FluidLoc |
| Connector | Miniature coaxial ClickLoc connector |
| Connector Protection | Not included |
| Approval Configuration | RU |
| Cable Type | FluidLoc standard cable |
| Probe Tip | 8 mm proximity sensing tip |
| Typical Probe Weight | Approx. 0.32 kg |
| Approx. Shipping Weight | Approx. 1.5 kg |
| Typical Application | Shaft vibration and position monitoring |
| Installation Environment | Industrial rotating machinery |
Applications
Steam Turbine Monitoring
The reverse-mount configuration is particularly useful on steam turbines where bearing housings and internal machine geometry restrict access for conventional front-mounted probes. The probe can monitor shaft movement without physical contact with the rotating shaft.
Gas Turbine Applications
Gas turbines require accurate monitoring of critical shaft and bearing behavior. The 330105 reverse-mount format provides additional mechanical installation flexibility where probe access from the rear side is preferred.
Compressor Protection
Large compressors often have limited space around bearing housings and shaft ends. A reverse-mounted 8 mm probe can provide a cleaner mechanical arrangement while maintaining the required proximity measurement geometry.
Generator Shaft Monitoring
Generators can use proximity measurement to observe shaft vibration and axial or radial position-related behavior. The 330105-02-12-10-12-RU can form part of a compatible 3300 XL monitoring chain for these applications.
Pumps and Motors
Critical pumps, motors, and auxiliary rotating equipment can benefit from continuous shaft monitoring. The non-contact sensing method allows the probe to detect changes in shaft position and vibration without contacting the rotating target.
Oil-Lubricated Machinery
The FluidLoc cable configuration makes this model especially attractive for machinery environments where lubricating oil is present. FluidLoc is intended to help limit fluid migration through the cable construction, adding an important environmental protection feature to the standard probe design.
Machinery Protection Systems
When combined with the appropriate 3300 XL extension cable and Proximitor Sensor, the probe can be incorporated into machinery protection and condition-monitoring systems designed to provide continuous information about rotating-shaft behavior.
Retrofit Installations
The model is also well suited to replacement projects where an existing system requires the same 330105 reverse-mount geometry, 1.0-meter cable, FluidLoc construction, and RU approval configuration. Matching the complete part number helps prevent configuration errors during maintenance.
Advantages
Reverse-Mount Architecture
The most important mechanical advantage is the reverse-mount configuration. It allows engineers to position the probe where conventional mounting would be difficult because of limited external access, bearing-housing geometry, or surrounding equipment.
8 mm Sensing Technology
The 8 mm probe platform provides a robust solution for continuous shaft vibration and position measurement on industrial rotating equipment. It is particularly appropriate for larger critical machines where reliable proximity monitoring is required.
FluidLoc Cable Protection
The 12 cable option provides FluidLoc construction, helping control the migration of oil and other fluids through the cable. This is a valuable feature for equipment installed around lubricated bearings and other fluid-exposed machinery areas.
1.0-Meter Integral Cable
The 1.0-meter integral cable gives approximately 3.3 feet of connection reach without requiring an immediately adjacent extension cable. It is a practical length for many bearing-housing and machine-mounted installations.
Compact Mechanical Profile
The 1.2-inch case length provides a relatively compact probe body while retaining the reverse-mount configuration. This can make installation easier in locations where available mechanical space is restricted.
ClickLoc Connection
The miniature coaxial ClickLoc connector provides a defined connection interface for compatible 3300 XL extension components. Its locking connection helps maintain a secure electrical path during continuous machinery operation.
Regional Approval Configuration
The RU suffix identifies the Russian certification configuration, allowing the probe to be selected for installations requiring the corresponding regional approval arrangement.
Non-Contact Measurement
The eddy-current proximity principle allows the probe to measure shaft movement without physical contact. This makes it suitable for continuous monitoring of high-speed rotating machinery where direct-contact sensing would be impractical.
Integrated 3300 XL System Compatibility
The probe is designed as a component of the 3300 XL proximity transducer system. When correctly paired with the associated extension cable and Proximitor Sensor, it provides a complete measurement path from the machine shaft to the monitoring electronics.
Technical FAQs
1. What is the Bently Nevada 330105-02-12-10-12-RU?
It is a 3300 XL 8 mm Reverse Mount Probe featuring a 3/8-24 UNF thread, 0.2-inch unthreaded section, 1.2-inch case, 1.0-meter integral cable, FluidLoc cable construction, ClickLoc connector, and RU certification configuration.
2. What does 330105 identify?
The 330105 base number identifies the 3300 XL 8 mm Reverse Mount Probe family using a 3/8-24 UNF mounting thread.
3. What does the first “02” mean?
The first 02 specifies a 0.2-inch unthreaded length, equivalent to approximately 5.08 mm.
4. What does the “12” after 02 mean?
The next 12 specifies a 1.2-inch probe case length, equivalent to approximately 30.48 mm.
5. How long is the cable?
The 10 cable-length option specifies a 1.0-meter integral cable, or approximately 3.3 feet.
6. What does the second “12” mean?
The second 12 identifies the FluidLoc cable configuration. This is different from the standard cable option and is intended for installations where improved resistance to fluid migration is desirable.
7. What does RU mean at the end of the part number?
The final RU identifies the Russia-specific certification or approval configuration. It should not be substituted with CN, 05, or another approval suffix unless the installation requirements have been verified.
8. Does this model have a connector protector?
No. The specified configuration uses the miniature coaxial ClickLoc connector without an additional connector-protector option.
9. What is the approximate weight of the probe?
The probe assembly is approximately 0.32 kg. Shipping weight can be considerably higher because it includes packaging and associated materials.
10. When should I choose the 330105-02-12-10-12-RU?
This model is a strong choice when the installation requires a reverse-mounted 8 mm proximity probe, 3/8-24 UNF thread, 1.2-inch case, 1.0-meter cable, FluidLoc protection, and RU certification configuration. It is particularly useful on rotating machinery where both installation access and exposure to lubricating fluids are important considerations.
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