Introduction
The Bently Nevada 330171-12-41-10-02-05 is a specialized 3300 5 mm proximity probe designed for non-contact measurement of shaft position and dynamic shaft movement in rotating machinery. It uses eddy-current sensing technology and is intended to operate as part of a compatible 3300 5 mm proximity transducer system.
What makes this configuration distinctive is its 1.2-inch unthreaded length, 4.1-inch overall case length, and 1.0-meter total cable length. The probe uses a 1/4-28 UNF thread, a miniature coaxial ClickLoc connector, and the multiple-approval configuration. The complete ordering code is important when selecting a replacement because the mechanical dimensions and connector arrangement can directly affect installation compatibility.
With its extended probe-body configuration, the 330171-12-41-10-02-05 is well suited to machinery installations where the sensing point is positioned farther from the mounting surface. It can be a practical choice for turbines, compressors, pumps, generators, and other critical rotating equipment where dependable shaft monitoring is part of the maintenance strategy.
Technical Specifications
The 330171 series represents the 3300 5 mm probe with 1/4-28 UNF-2A thread and without armor. For this particular part number, the ordering sequence identifies a 1.2-inch unthreaded section, 4.1-inch case length, 1.0-meter cable, ClickLoc connector, and multiple approvals.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model | 330171-12-41-10-02-05 |
| Product Type | 3300 5mm Proximity Probe |
| Sensing Principle | Eddy-current, non-contact |
| Probe Series | 3300 5 mm |
| Probe Base Model | 330171 |
| Thread | 1/4-28 UNF-2A |
| Armor | Without armor |
| Unthreaded Length | 1.2 in (30.5 mm) |
| Overall Case Length | 4.1 in (104.1 mm) |
| Total Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc connector |
| Cable Configuration | Standard cable |
| Cable Impedance | 75 Ω |
| Probe Tip Diameter | 5.2 mm (0.21 in) |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 303/304 stainless steel |
| Probe Temperature Range | -35°C to +177°C (-31°F to +351°F) |
| Minimum Cable Bend Radius | 25.4 mm (1.0 in) |
| Recommended Probe Case Torque | 5.1 N·m (45 in-lb) |
| Maximum Probe Case Torque | 7.3 N·m (65 in-lb) |
| Typical Probe Weight | Approximately 323 g (11.39 oz) |
| Approval Configuration | 05 — Multiple Approvals |
Applications
Turbine Rotor Monitoring
The probe can be incorporated into appropriate turbine monitoring systems to measure shaft displacement and dynamic rotor movement. This information can help operators identify changes in machine behavior and support condition-based maintenance.
Compressor Monitoring
Large compressors often require carefully positioned proximity probes around the shaft. The 4.1-inch body gives this configuration additional physical reach where a shorter probe would not provide the required mounting geometry.
Pump and Generator Protection
For suitable pumps, motors, and generators, the probe can provide non-contact shaft measurements for vibration and position monitoring. These measurements can contribute to early detection of mechanical changes.
Fluid-Film Bearing Machines
The 3300 5 mm transducer system is particularly suited to vibration and position measurement on machinery using fluid-film bearings. It can measure both static position and dynamic vibration when properly integrated with the associated system components.
Keyphasor and Speed Measurement
Suitable 3300 5 mm system configurations can also support Keyphasor and speed-measurement applications. This makes the probe family useful beyond conventional shaft-vibration monitoring.
Retrofit and Replacement Projects
The exact 330171-12-41-10-02-05 configuration can be valuable when maintaining an existing installation that requires a longer probe body. Matching the complete part number helps reduce the risk of mechanical mismatch during replacement.
Advantages
Extended 4.1-Inch Case
The 4.1-inch case length provides greater physical reach than many conventional 3300 5 mm probe configurations. It is particularly useful when the mounting point is separated from the measurement target by a relatively deep installation geometry.
1.2-Inch Unthreaded Section
The 1.2-inch unthreaded section is an important mechanical feature. It allows the probe to accommodate a specific mounting arrangement while maintaining the required sensing position.
Accurate Non-Contact Measurement
Eddy-current technology allows the probe to measure shaft movement without physically contacting the rotating surface. This makes the design suitable for continuous monitoring of high-speed rotating equipment.
Compact 5 mm Sensing Tip
The probe retains the compact 5.2 mm sensing tip of the 3300 5 mm family even though its overall body is relatively long. This can simplify installation where radial space around the target is restricted.
Rugged Materials
The probe uses an AISI 303/304 stainless-steel case and a PPS sensing tip, providing a robust industrial construction. The specified probe temperature range extends from -35°C to +177°C.
Practical 1-Meter Cable
The 1.0-meter cable offers a useful balance between installation flexibility and cable management. It is well suited to applications where the probe does not need an unusually long connection.
ClickLoc Connector
The miniature coaxial ClickLoc connector provides a compact interface for compatible 3300 system components and can make installation and servicing more convenient.
Multiple-Approval Option
The final 05 identifies the multiple-approval configuration. This can be an important selection criterion when the installation has specific equipment approval requirements.
Technical FAQs
1. What is the Bently Nevada 330171-12-41-10-02-05?
It is a 3300 5 mm proximity probe with a 1/4-28 UNF thread, 1.2-inch unthreaded length, 4.1-inch overall case length, 1.0-meter cable, miniature coaxial ClickLoc connector, and multiple-approval configuration.
2. What does the 330171 base number indicate?
The 330171 designation identifies the 3300 5 mm probe with a 1/4-28 UNF-2A thread and without armor.
3. What does the “12” in the part number mean?
The first 12 identifies the 1.2-inch unthreaded length, approximately 30.5 mm.
4. What does “41” specify?
The 41 identifies the 4.1-inch overall case length, equivalent to approximately 104.1 mm.
5. How long is the cable?
The probe has a 1.0-meter (3.3-foot) total cable length.
6. What connector is used?
The 02 option specifies a miniature coaxial ClickLoc connector with standard cable.
7. What does the final “05” represent?
The final 05 identifies the multiple-approval option. The applicable approval requirements should be checked against the intended installation before procurement.
8. Can this probe measure both shaft position and vibration?
Yes. As part of a properly configured 3300 5 mm transducer system, the probe can support both static shaft-position and dynamic vibration measurements.
9. What is the probe weight?
The standard 3300 5 mm probe specification is approximately 323 g (11.39 oz). Complete system weight depends on the extension cable and Proximitor sensor used with it.
10. Can it directly replace a shorter 3300 5 mm probe?
Not necessarily. The 1.2-inch unthreaded section and 4.1-inch case length are significant installation dimensions. A shorter probe may place the sensing tip at the wrong position relative to the shaft target. The complete part number, mounting geometry, cable arrangement, and system configuration should be checked before substitution.
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