Introduction
The Bently Nevada 330105-02-12-90-02-05 is a 3300 XL 8 mm Reverse Mount Probe designed for non-contact measurement of shaft vibration and position on critical rotating machinery. Its reverse-mount architecture allows the probe to be installed from the inside of suitable machine housings outward, making it especially useful where conventional probe installation is limited by bearing-housing geometry or restricted external access.
This configuration combines a 3/8-24 UNF mounting thread, 0.2-inch unthreaded section, 1.2-inch case length, and an exceptionally long 9.0-meter integral cable. The 02 option specifies a Miniature ClickLoc coaxial connector with standard cable construction, while the final 05 identifies the multiple-agency approval configuration. The 9-meter cable option is the longest standard cable length offered within the 330105 reverse-mount configuration family.
For large turbines, compressors, generators, and other critical rotating equipment, the extended cable reach can simplify installations where the sensing point is far from the Proximitor Sensor location. The result is a flexible solution for projects requiring both reverse mounting and substantial probe-to-sensor separation.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330105-02-12-90-02-05 |
| Product Family | 3300 XL |
| Product Type | 8 mm Reverse Mount Probe |
| Measurement Principle | Eddy-current proximity measurement |
| Mounting Style | Reverse Mount |
| Mounting Thread | 3/8-24 UNF |
| Unthreaded Length | 0.2 in / 5.08 mm |
| Case Length | 1.2 in / 30.48 mm |
| Integral Cable Length | 9.0 m / 29.5 ft |
| Cable Length Option | 90 |
| Connector/Cable Option | 02 |
| Connector | Miniature ClickLoc coaxial connector |
| Cable Construction | Standard cable |
| Agency Approval | 05 – Multiple approvals |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303/304 stainless steel |
| Probe Diameter | 8 mm sensing system |
| Typical Probe Weight | Approx. 0.323 kg |
| Typical Shipping Weight | Approx. 0.8 kg |
| Typical Application | Shaft vibration and position monitoring |
| System | 3300 XL 8 mm Proximity Transducer System |
Applications
Large Steam Turbines
The 9-meter cable configuration is well suited to large steam turbine installations where the sensing location and instrumentation equipment may be physically separated. The reverse-mount arrangement can also simplify installation around bearing housings with restricted external access.
Gas Turbine Monitoring
Gas turbines require continuous monitoring of critical shaft behavior. The 330105-02-12-90-02-05 provides long cable reach while retaining the compact reverse-mount probe format.
Large Compressors
Centrifugal and axial compressors often have complex bearing and casing structures. The long integral cable allows the probe to reach remotely located monitoring equipment without immediately requiring an additional extension cable.
Generator Shaft Monitoring
Large generators can use proximity probes for shaft vibration and position measurements. The 9-meter cable can accommodate installations where the machine-mounted sensing point is separated from the instrumentation cabinet or sensor location.
Industrial Pumps and Motors
Critical pumps, motors, and auxiliary rotating equipment may require continuous shaft monitoring while their monitoring electronics are positioned away from the machine. The long cable provides useful routing flexibility.
Hazardous-Area Machinery
The 05 configuration provides the multiple-agency approval option associated with the 3300 XL system. This makes the model suitable for projects where the specified probe configuration must meet applicable hazardous-area requirements. Actual installation certification must always be verified against the project requirements.
Remote Proximitor Installations
The long cable is particularly valuable when the Proximitor Sensor is located in a more accessible or protected area while the probe itself is installed directly at the machine. This arrangement can simplify maintenance and improve accessibility to the signal-conditioning equipment.
Retrofit Projects
For existing systems that specify a 330105 reverse-mount probe with 9.0-meter cable, Miniature ClickLoc connector, and 05 approval configuration, the complete 330105-02-12-90-02-05 part number provides a precise replacement reference.
Advantages
9-Meter Cable Reach
The defining advantage of this configuration is its 9.0-meter integral cable. It is the longest standard cable-length option in the 330105 family and provides approximately 29.5 feet of routing distance.
Reverse-Mount Installation
The reverse-mount architecture makes the probe suitable for machine arrangements where installation from the reverse side is more practical than conventional front mounting. This can be particularly valuable inside bearing housings and machine casings.
Miniature ClickLoc Connector
The 02 configuration uses a Miniature ClickLoc coaxial connector, providing the intended connection interface for compatible 3300 XL extension components and monitoring equipment.
Standard Cable Configuration
Unlike FluidLoc versions, the 02 configuration uses the standard cable arrangement. This provides a straightforward choice when the installation does not specifically require FluidLoc construction.
Multiple Agency Approval
The final 05 option identifies the multiple-approval configuration, an important selection parameter for applications subject to applicable hazardous-area certification requirements.
Compact Probe Body
The extended cable does not change the basic reverse-mount mechanical dimensions. The probe retains its compact 0.2-inch unthreaded section and 1.2-inch case length, making it practical for confined machine locations.
Non-Contact Shaft Measurement
The eddy-current sensing principle provides non-contact measurement of shaft displacement. This is particularly advantageous for high-speed machinery because the probe does not physically contact the rotating shaft.
Reduced Need for Additional Cable Connections
A 9-meter integral cable can eliminate the need for an additional extension cable in installations that fall within the specified cable length. Fewer intermediate connections can make routing and installation planning simpler.
Purpose-Built 3300 XL Compatibility
The probe is designed as part of the 3300 XL 8 mm proximity transducer system. Correctly matching the probe, cable, and Proximitor Sensor helps maintain the intended electrical characteristics of the complete measurement chain.
Technical FAQs
1. What is the Bently Nevada 330105-02-12-90-02-05?
It is a 3300 XL 8 mm Reverse Mount Probe configured with a 3/8-24 UNF mounting thread, 0.2-inch unthreaded section, 1.2-inch case, 9.0-meter cable, Miniature ClickLoc connector, and multiple-agency approval option.
2. How long is the cable?
The 90 option specifies a 9.0-meter total cable length, equivalent to approximately 29.5 feet.
3. What does the first “02” mean?
The first 02 identifies the 0.2-inch unthreaded section of the reverse-mount probe, approximately 5.08 mm.
4. What does “12” mean?
The 12 identifies the 1.2-inch case length, approximately 30.48 mm.
5. What does the second “02” specify?
The second 02 identifies the Miniature ClickLoc coaxial connector and standard cable configuration.
6. What does the final “05” mean?
The 05 identifies the multiple-agency approval configuration. The 3300 XL ordering information lists this option as the multiple-approval version.
7. Is the 330105-02-12-90-02-05 a FluidLoc cable version?
No. The 02 cable option is the standard cable configuration. The FluidLoc configuration is identified separately by the 12 cable option.
8. What is the approximate probe weight?
The 330105 probe assembly is commonly specified at approximately 0.323 kg. A supplier listing for the exact 330105-02-12-90-02-05 gives approximately 0.8 kg as shipping weight.
9. Can the 9-meter probe be used with a shorter system configuration?
The total electrical length of a 3300 XL proximity system must be considered when selecting the probe, extension cable, and Proximitor Sensor. A 9-meter probe should not be treated as interchangeable with a shorter configuration simply because the mechanical probe body is similar.
10. When should I choose the 330105-02-12-90-02-05?
This model is appropriate when the application requires a 3300 XL 8 mm reverse-mount probe with 3/8-24 UNF mounting, 9.0-meter cable, Miniature ClickLoc connector, and multiple-agency approval. It is especially attractive for large machinery where the sensing point and monitoring electronics are separated by a substantial distance.
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