Introduction
The Bently Nevada 330171-13-40-05-01-RU is a 3300 5 mm proximity probe intended for non-contact measurement of shaft position and dynamic movement in rotating machinery. It uses the established eddy-current sensing principle of the 3300 5 mm transducer family, converting changes in the probe-to-target gap into a corresponding electrical signal when used with the appropriate Proximitor sensor and extension cable.
This configuration is differentiated from the more common 330171 variants by its 13-unit unthreaded length, 4.0-inch overall case length, 0.5-meter cable, miniature coaxial ClickLoc connector, and RU approval configuration. The longer probe-body arrangement can be valuable where the machinery mounting geometry requires additional reach between the threaded mounting location and the sensing position.
For turbine, compressor, pump, generator, and other critical rotating-equipment applications, this probe offers a practical solution for integrating shaft displacement and vibration measurements into an established Bently Nevada monitoring architecture.
Technical Specifications
The complete part number should be used when identifying this probe. In the 3300 5 mm ordering structure, the 330171 family represents the 1/4-28 UNF threaded, unarmored probe, while the individual suffixes define the mechanical and connection configuration.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model | 330171-13-40-05-01-RU |
| Product Type | 3300 5 mm Proximity Probe |
| Sensing Principle | Eddy-current, non-contact |
| Probe Series | 3300 5 mm |
| Thread | 1/4-28 UNF |
| Armor | Without armor |
| Unthreaded Length | 1.3 in (33.0 mm) |
| Overall Case Length | 4.0 in (101.6 mm) |
| Total Cable Length | 0.5 m (1.6 ft) |
| Connector | Miniature coaxial ClickLoc connector |
| Cable Type | Standard 75 Ω triaxial cable |
| 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) |
| Probe Tensile Strength | 222 N (50 lbf) |
| Typical Probe Weight | Approximately 323 g |
| Approval Configuration | RU — region-specific approval configuration |
Applications
Turbine Rotor Monitoring
The 330171-13-40-05-01-RU can be incorporated into suitable turbine monitoring arrangements to measure shaft movement and provide continuous information about rotor behavior. Such measurements are valuable for identifying abnormal vibration, shaft-position changes, and developing mechanical conditions.
Compressor Condition Monitoring
Large compressors often require carefully positioned proximity sensors around the rotor. The extended 4.0-inch case configuration can be advantageous when the sensing point is located farther from the mounting surface than would be practical with a shorter probe.
Pump and Generator Applications
The probe can be used in suitable pump, motor, and generator monitoring systems where non-contact measurement of shaft displacement or vibration is required.
Fluid-Film Bearing Machines
The 3300 5 mm transducer system is particularly associated with vibration and position measurement on fluid-film bearing machinery. With compatible system components, it can provide both static shaft-position and dynamic vibration information.
Machinery Protection
When integrated with a compatible Proximitor sensor and extension cable, the probe becomes part of a complete machinery monitoring chain. This arrangement can provide the continuous shaft data required by machinery protection and condition-monitoring systems.
Maintenance and Retrofit Projects
The longer probe-body configuration can be useful when replacing an existing sensor in machinery with a deeper or more specialized mounting arrangement. Matching the complete part number helps maintenance teams avoid unnecessary mechanical modifications during replacement.
Advantages
Extended 4.0-Inch Case
The 4.0-inch overall case length gives this model a substantially longer physical profile than many standard 3300 5 mm configurations. This makes it useful where the probe must reach through a deeper mounting arrangement.
1.3-Inch Unthreaded Section
The 1.3-inch unthreaded length provides additional mechanical flexibility for installations in which the probe geometry requires a defined distance between the threaded mounting area and the probe body.
Proven Eddy-Current Technology
Non-contact eddy-current sensing allows the probe to monitor a conductive shaft target without physically contacting the rotating component. This is particularly valuable for high-speed machinery.
Compact 5 mm Sensing Tip
Although the body is longer, the probe retains the compact 5 mm sensing format. This helps maintain a relatively small sensing footprint at the measurement location.
Robust Industrial Construction
The probe case uses AISI 303/304 stainless steel, while the sensing tip is manufactured from PPS. The 3300 5 mm family is specified for a probe temperature range from -35°C to +177°C.
Short 0.5-Meter Cable
The 0.5-meter cable is well suited to installations where the probe is located relatively close to the next component in the transducer chain. It can help keep cable routing neat without introducing unnecessary cable length.
Practical ClickLoc Connection
The miniature coaxial ClickLoc connector provides a compact connection interface for compatible 3300 system components and supports efficient installation and maintenance.
Suitable for Critical Equipment
When correctly integrated into a complete 3300 transducer system, the probe can provide the shaft-position and vibration data needed for proactive machinery monitoring, helping maintenance teams make better-informed service decisions.
Technical FAQs
1. What is the Bently Nevada 330171-13-40-05-01-RU?
It is a Bently Nevada 3300 series 5 mm proximity probe configured with a 1/4-28 UNF mounting arrangement, 1.3-inch unthreaded length, 4.0-inch overall case length, 0.5-meter cable, ClickLoc connector, and RU 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 thread and without armor. The remaining ordering fields specify the particular mechanical and connection configuration.
3. What does the “13” option represent?
For this configuration, the 13 identifies a 1.3-inch unthreaded length, which is approximately 33.0 mm.
4. What does the “40” option specify?
The 40 identifies the 4.0-inch overall case length, equivalent to approximately 101.6 mm.
5. How long is the probe cable?
The total cable length is 0.5 meter (1.6 feet).
6. What type of connector does this model use?
The 01 connector configuration uses a miniature coaxial ClickLoc connector. The exact cable and connector arrangement should be matched with the associated 3300 system components during replacement.
7. What is the operating temperature range?
The 3300 5 mm probe family is specified for a probe temperature range of -35°C to +177°C (-31°F to +351°F).
8. Can this probe measure both shaft position and vibration?
Yes. When used as part of a compatible 3300 transducer system, the system can provide both static shaft-position and dynamic vibration measurements.
9. What is the weight of the probe?
The standard 3300 5 mm probe specification lists a weight of approximately 323 g (11.39 oz). The complete system weight is typically approximately 0.71 kg, depending on the selected extension cable and Proximitor sensor.
10. Can a shorter 3300 5 mm probe be used as a direct replacement?
Not without checking the installation. The 1.3-inch unthreaded section and 4.0-inch case length are important mechanical characteristics. A shorter probe may not position the sensing tip correctly relative to the shaft target. The complete part number and mounting dimensions should therefore be verified before replacement.
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