Introduction
The Bently Nevada 330105-20-12-10-02-00 is a 3300 XL 8 mm Reverse Mount Probe designed for non-contact monitoring of shaft vibration and position on critical rotating machinery. The reverse-mount configuration is especially useful where the available installation geometry requires the probe to approach the measurement target from inside the equipment structure rather than through a conventional external mounting arrangement.
This model is configured with a 1.0-meter total cable length, a Miniature ClickLoc coaxial connector, and a standard 00 agency-approval configuration. The 3300 XL 8 mm platform is intended to work as part of a complete proximity transducer system, with the probe, cable, and compatible Proximitor Sensor selected as a matched electrical and mechanical arrangement. Comparable 330105 configurations specify the 1.0-meter option, Miniature ClickLoc connector, PPS probe tip, and stainless-steel probe case.
For power-generation, oil and gas, compressor, turbine, and other rotating-equipment applications, this probe offers a practical combination of non-contact sensing, reverse installation flexibility, and compact cable routing. It is also a useful replacement candidate where the existing system is already built around the 3300 XL 8 mm platform.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330105-20-12-10-02-00 |
| Product Family | 3300 XL |
| Product Type | 8 mm Reverse Mount Probe |
| Measurement Technology | Eddy-current proximity sensing |
| Mounting Style | Reverse Mount |
| Probe Diameter | 8 mm |
| Mounting Thread | 3/8-24 UNF family configuration |
| Total Cable Length | 1.0 m / 3.3 ft |
| Cable Length Option | 10 |
| Connector Option | 02 |
| Connector Type | Miniature ClickLoc coaxial connector |
| Cable Configuration | Standard cable |
| Agency Approval | 00 – Not required |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303/304 stainless steel |
| Typical Function | Shaft vibration and position measurement |
| System | 3300 XL 8 mm Proximity Transducer System |
| Approx. Probe Weight | 0.323 kg class |
| Typical Shipping Weight | Approx. 1.5–2 kg, depending on packaging |
Applications
Steam Turbine Shaft Monitoring
The 3300 XL 8 mm proximity platform is well suited to steam-turbine monitoring, where shaft vibration and radial position can provide valuable information about bearing and rotor behavior. The reverse-mount arrangement can be advantageous when the physical structure limits access from the conventional probe direction.
Gas Turbine Equipment
Gas turbines operate at high speed and under demanding mechanical conditions. A correctly configured proximity probe can provide continuous shaft information for machinery monitoring and protection applications.
Compressor Monitoring
Large centrifugal and axial compressors often have compact bearing housings and restricted probe access. The reverse-mount design offers an alternative installation method while the 1-meter cable provides practical routing distance to the associated monitoring hardware.
Generator Applications
Generator shafts can be monitored for changes in vibration and position associated with imbalance, alignment, bearing conditions, or other mechanical influences. The 330105 platform provides a non-contact sensing solution for appropriately designed systems.
Pumps and Motors
Critical pumps, motors, fans, and auxiliary rotating equipment can benefit from continuous proximity measurement. The non-contact design avoids direct mechanical contact with the shaft and is therefore suitable for high-speed rotating components.
Fluid-Film Bearing Machinery
Fluid-film bearing systems depend on maintaining appropriate shaft position and dynamic behavior. Proximity sensing provides a direct method of observing shaft displacement relative to the stationary bearing structure.
Machinery Protection Systems
When combined with a compatible Proximitor Sensor and correctly selected extension cable, the probe can form part of a machinery protection chain capable of monitoring shaft vibration and position continuously.
Retrofit and Replacement Installations
For plants already using a 3300 XL 8 mm system, maintaining the same probe configuration can simplify replacement work. The complete model number should be checked against the existing probe, especially where cable length, connector type, or mechanical mounting characteristics are critical.
Advantages
Reverse-Mount Installation
The reverse-mount architecture gives engineers greater freedom when working around crowded bearing housings and enclosed machine structures. It can make the sensing point accessible without requiring major changes to the surrounding mechanical assembly.
1-Meter Cable Configuration
The 1.0-meter cable provides approximately 3.3 feet of integral connection length. It is a practical choice for installations where the Proximitor Sensor or cable termination point is located at a moderate distance from the probe.
Miniature ClickLoc Connection
The 02 connector option uses a Miniature ClickLoc coaxial connector, offering a compact interface intended for compatible 3300 XL system components.
Non-Contact Operation
Eddy-current sensing measures shaft movement without physical contact. This eliminates probe-tip wear caused by continuous contact with a rotating shaft and makes the technology particularly valuable for high-speed machinery.
Robust Materials
The 3300 XL 8 mm probe family uses a PPS probe tip and AISI 303/304 stainless-steel case, providing a durable construction suitable for demanding industrial installations.
Standard Industrial Configuration
The final 00 option indicates that additional agency approval is not required. For standard industrial installations where specialized certification is not specified, this keeps the configuration straightforward.
Flexible System Architecture
The 1-meter probe cable can be used as part of a larger 3300 XL system where additional extension length is required. This allows the monitoring electronics to be positioned in a more convenient location without changing the basic sensing principle.
Strong 8 mm Platform
The 8 mm probe construction offers a robust alternative to smaller probe formats where sufficient mounting space is available. The larger probe body also provides a mechanically durable assembly for industrial service.
Maintenance-Friendly Replacement
Using a probe with the correct configuration can reduce unnecessary mechanical modifications and help maintenance teams restore an existing monitoring channel more efficiently.
Technical FAQs
1. What is the Bently Nevada 330105-20-12-10-02-00?
It is a 3300 XL 8 mm Reverse Mount Probe intended for non-contact measurement of rotating-shaft vibration and position.
2. What is the cable length?
The 10 cable-length option corresponds to a 1.0-meter total cable length, approximately 3.3 feet, in the comparable 330105 ordering configuration.
3. Which connector is used?
The 02 connector option specifies a Miniature ClickLoc coaxial connector.
4. What does the final 00 mean?
The 00 agency-approval option indicates that additional agency approval is not required for the standard configuration.
5. What does “8 mm” refer to?
It identifies the 3300 XL 8 mm proximity probe family and its nominal sensing-tip diameter. The 8 mm platform is designed for non-contact rotating-shaft measurement.
6. What is the sensing principle?
The probe uses eddy-current proximity sensing. Changes in the distance between the probe tip and a conductive shaft target produce a corresponding electrical response used by the associated Proximitor Sensor.
7. What materials are used?
Comparable 330105 documentation specifies polyphenylene sulfide (PPS) for the probe tip and AISI 303 or 304 stainless steel for the probe case.
8. What is the approximate weight?
A comparable 330105-02-12-10-02-00 configuration is listed at approximately 0.323 kg net weight, with approximately 1.5 kg shipping weight.
9. Can it be connected directly to a Proximitor Sensor?
The probe is intended to operate as part of a complete 3300 XL proximity transducer system. The probe, total electrical length, extension cable if used, and Proximitor Sensor should be selected as a compatible system rather than as isolated components.
10. Is every 330105 probe interchangeable?
No. Different 330105 variants can have different mechanical configurations, cable lengths, connector arrangements, and approval options. The complete part number should be matched before treating a probe as a direct replacement.
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