Introduction
The Bently Nevada 330105-02-12-15-12-05 is a 3300 XL 8 mm Reverse Mounting Probe designed for precise, non-contact monitoring of shaft vibration and position on critical rotating machinery. Its reverse-mount construction provides an important installation alternative when conventional probe mounting is restricted by bearing-housing geometry, limited access, or surrounding mechanical components.
This particular configuration combines a 3/8-24 UNF reverse-mount probe design, 0.2-inch unthreaded section, 1.2-inch case length, and a 1.5-meter integral cable. Unlike the standard cable configuration, the 12 cable option incorporates a Miniature ClickLoc coaxial connector with FluidLoc cable construction, making this version especially attractive for installations where cable-fluid migration resistance is an important consideration. The final 05 suffix identifies the applicable agency-approval configuration.
As part of the 3300 XL 8 mm Proximity Transducer System, the probe works with the appropriate extension cable and Proximitor Sensor. Together, these components provide a dependable measurement chain for monitoring shaft displacement, dynamic vibration, and related machinery behavior. For turbine, compressor, generator, and other high-value rotating equipment, this configuration offers a useful combination of installation flexibility, environmental protection, and established proximity-monitoring technology.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330105-02-12-15-12-05 |
| Product Family | 3300 XL |
| Product Type | 8 mm Reverse Mounting Probe |
| Measurement Principle | Non-contact eddy-current proximity measurement |
| Mounting Style | Reverse Mount |
| Thread | 3/8-24 UNF |
| Unthreaded Length | 0.2 in / 5.08 mm |
| Case Length | 1.2 in / 30.48 mm |
| Total Cable Length | 1.5 m / 4.9 ft |
| Cable Option | 15 |
| Connector/Cable Option | 12 – Miniature ClickLoc coaxial connector, FluidLoc cable |
| Approval Option | 05 – Agency-approved configuration |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303 or 304 stainless steel |
| Probe Diameter | 8 mm sensing system |
| Typical Probe Weight | Approx. 0.323 kg |
| Shipping Weight | Approx. 1.5 kg |
| Typical Application | Shaft vibration and position monitoring |
| System | 3300 XL 8 mm Proximity Transducer System |
Applications
Steam Turbine Shaft Monitoring
Steam turbines require dependable monitoring of shaft vibration and position around critical bearings. The reverse-mount design allows engineers to accommodate mounting arrangements where a conventional probe orientation is impractical.
Gas Turbine Machinery
The 330105 series can be integrated into suitable gas turbine monitoring systems where non-contact measurement of rotating-shaft behavior is required. The reverse mounting arrangement provides additional mechanical installation flexibility.
Centrifugal and Axial Compressors
Compressor bearing housings can have very restricted installation space. The compact reverse-mount probe can be positioned to achieve the required shaft-to-probe geometry while keeping the sensing assembly away from congested machine areas.
Generator Monitoring
Large generators can use proximity probes to observe shaft vibration and position. The 330105-02-12-15-12-05 provides a 1.5-meter cable configuration suitable for installations where the sensing point and connection location have moderate separation.
Pumps and Motors
Critical pumps and motors can benefit from continuous proximity-based shaft monitoring. Changes in vibration or shaft position can provide useful information for condition-monitoring and machinery-protection strategies.
Fluid-Lubricated Bearing Machines
The FluidLoc cable configuration is particularly relevant to machines with lubricated bearings. The cable construction is designed to help resist fluid migration through the cable, making this configuration a practical choice for demanding machine environments.
Machinery Protection Systems
When paired with the appropriate 3300 XL Proximitor Sensor and compatible extension cable, the probe can form part of a continuous machinery protection or condition-monitoring system.
Retrofit and Maintenance Applications
For an existing installation specified for a 330105-02-12-15-12-05, using the exact part number helps preserve the original mechanical dimensions, cable length, FluidLoc configuration, connector interface, and approval arrangement.
Advantages
Reverse-Mount Flexibility
The reverse-mount configuration is the key mechanical advantage of the 330105 family. It provides an alternative installation approach for machines where front-side probe mounting is restricted by limited clearance or structural design.
Integrated FluidLoc Cable
The 12 cable option provides FluidLoc construction, helping reduce the risk of fluid migration through the cable. This is particularly useful around oil-lubricated bearing housings and other machinery locations where the cable may encounter lubricants.
1.5-Meter Cable Reach
With a 1.5-meter integral cable, the probe offers approximately 4.9 feet of cable reach. This configuration is long enough for many machine-mounted installations while remaining easier to route than very long cable assemblies.
Miniature ClickLoc Connector
The miniature coaxial ClickLoc connector provides a purpose-built interface for the 3300 XL proximity system. The connector configuration is an important part of maintaining a correctly matched probe and extension-cable assembly.
Durable Probe Construction
The probe case uses AISI 303 or 304 stainless steel, while the probe tip uses polyphenylene sulfide (PPS). This combination provides a robust mechanical package for industrial rotating-equipment applications.
Non-Contact Measurement
Eddy-current proximity technology enables the probe to monitor the relative movement between the probe tip and conductive shaft target without physical contact. This makes it particularly suitable for high-speed rotating machinery.
Agency-Approved Configuration
The final 05 suffix identifies an agency-approved configuration. For installations subject to specific certification requirements, using the correct approval option can be just as important as matching the mechanical and electrical configuration.
Better Environmental Suitability
Compared with a conventional standard-cable configuration, the FluidLoc option provides an additional level of cable protection against fluid migration. This makes the 330105-02-12-15-12-05 a compelling option for demanding machinery environments.
Designed for Critical Machinery
The 3300 XL proximity platform is widely associated with continuous monitoring of rotating machinery. Selecting the correct reverse-mount and cable configuration helps engineers build a measurement system suited to long-term operation rather than relying on a generic displacement sensor.
Technical FAQs
1. What is the Bently Nevada 330105-02-12-15-12-05?
It is a 3300 XL 8 mm Reverse Mounting Probe with a 3/8-24 UNF mounting arrangement, 0.2-inch unthreaded section, 1.2-inch case, 1.5-meter cable, FluidLoc cable construction, Miniature ClickLoc connector, and 05 agency approval configuration.
2. What does the 330105 base number represent?
The 330105 identifies the 3300 XL 8 mm Reverse Mount Probe family. This series is intended for installations requiring the probe to be mounted from the reverse side.
3. What does the first “02” mean?
The first 02 identifies the 0.2-inch unthreaded section, equivalent to approximately 5.08 mm.
4. What does “12” mean after the first 02?
The next 12 identifies the 1.2-inch case length, equivalent to approximately 30.48 mm.
5. How long is the cable?
The 15 option specifies a 1.5-meter total cable length, or approximately 4.9 feet.
6. What is special about the second “12”?
The second 12 identifies the Miniature ClickLoc coaxial connector with FluidLoc cable. This is the major configuration difference from a standard 02 cable option.
7. What is FluidLoc?
FluidLoc is a cable construction designed to help prevent or limit the migration of fluids through the cable. It is useful in machinery environments where lubricating oil or other fluids may be present around the probe and cable assembly.
8. What is the approximate weight?
The specified probe weight is approximately 0.323 kg. A published shipping weight of approximately 1.5 kg includes packaging and should not be confused with the installed probe weight.
9. What materials are used in the probe?
The probe tip is specified as polyphenylene sulfide (PPS), while the probe case is made from AISI 303 or 304 stainless steel.
10. Is this probe interchangeable with 330105-02-12-15-02-05?
Not automatically. Both models use the same general 330105 reverse-mount platform and 1.5-meter cable length, but the 12 cable configuration includes FluidLoc, whereas the 02 configuration is a different cable/connector arrangement. The complete system requirements, cable construction, connector, and approval configuration should be verified before substitution.
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