Introduction
The Bently Nevada 330191-00-33-90-05 is a 3300 XL 8 mm Extended Temperature Range (ETR) Proximity Probe developed for demanding rotating-equipment monitoring applications. It provides non-contact measurement of shaft displacement and can be integrated into machinery-protection systems for vibration, position, Keyphasor reference, and speed measurements.
This configuration belongs to the 330191 series, which uses a 3/8-24 UNF thread and non-armored construction. The part-number combination is particularly useful because it identifies a specific mechanical and cable configuration rather than simply identifying the probe family.
For this model, 00 represents zero unthreaded length, 33 represents a 3.3-inch overall case length, 90 specifies a 9.0 m total cable length, and 05 identifies the multiple-approval configuration.
Technical Specifications
The 330191 is the physical sensing element of the 3300 XL proximity transducer system. It is designed to work with a compatible Proximitor Sensor and the corresponding system configuration. The 8 mm probe design uses eddy-current sensing to measure the distance between the probe tip and the conductive shaft target without mechanical contact.
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330191-00-33-90-05 |
| Product Type | 3300 XL 8 mm ETR Proximity Probe |
| Probe Series | 330191 |
| Construction | Non-armored |
| Thread | 3/8-24 UNF-2A |
| Probe Tip Diameter | 8.0 mm (0.31 in) |
| Unthreaded Length | 0.0 in |
| Overall Case Length | 3.3 in (83.82 mm) |
| Total Cable Length | 9.0 m (29.5 ft) |
| Cable Configuration | Standard cable |
| Connector | Miniature coaxial ClickLoc |
| Measurement Technology | Eddy-current, non-contact |
| Primary Measurements | Shaft vibration and shaft position |
| Additional Measurements | Keyphasor reference and speed |
| Temperature Design | Extended Temperature Range |
| Approval Option | Multiple Approvals |
| Approvals | CSA, ATEX, IECEx |
| Typical Probe Weight | Approximately 323 g/m |
| Total System Weight | Approximately 0.7 kg typical |
| Installation | Threaded, standard-mount proximity probe |
Applications
Steam and Gas Turbines
The 330191 ETR probe is well suited to turbine applications where probe temperature can exceed the practical range of conventional proximity probes. Direct shaft measurement provides useful information during startup, shutdown, load changes, and normal operation.
Centrifugal Compressors
The probe can be incorporated into compressor monitoring channels to observe shaft vibration and position. This is particularly valuable where rotor dynamics and bearing behavior are critical to machine reliability.
High-Temperature Rotating Equipment
The ETR construction is intended for applications where the sensing element is exposed to elevated temperatures. This gives the 330191 family an important advantage over standard-temperature probe designs in thermally demanding installations.
Fluid-Film Bearing Machines
The 3300 XL 8 mm system is commonly applied to machines using fluid-film bearings because the probe measures rotor movement directly. This can provide more meaningful shaft information than relying exclusively on casing vibration.
Generator and Motor Monitoring
The probe can be used as part of a shaft-monitoring arrangement on large generators and motors where direct measurement of rotor displacement is required.
Keyphasor Applications
With the appropriate target arrangement and monitoring hardware, the proximity transducer system can provide a once-per-revolution reference signal for rotational analysis, phase measurements, and related machinery-monitoring functions.
Advantages
Extended Temperature Range
The primary strength of the 330191 series is its ETR construction. It is specifically intended for applications in which higher probe temperatures make a standard proximity probe less appropriate.
9-Meter Configuration
The 90 suffix provides a 9.0 m total-length configuration, giving considerable flexibility when the sensing location and monitoring electronics are separated by a substantial distance.
Compact 8 mm Sensing Tip
The 8 mm probe tip offers a useful balance between physical robustness and installation practicality. Bently Nevada documentation notes that the larger 8 mm probe construction provides a more rugged encapsulation and stronger probe body compared with smaller 5 mm designs.
Robust Threaded Construction
The 3/8-24 UNF-2A threaded body provides a mechanically secure mounting method for compatible machinery installations.
Zero Unthreaded Length
The 00 configuration specifies 0.0 inch unthreaded length, allowing the ordered probe geometry to remain relatively compact around the threaded case.
Non-Contact Operation
Eddy-current sensing measures shaft displacement without physical contact. There is therefore no normal probe-tip rubbing against the rotating shaft, supporting continuous machinery monitoring.
Multiple Approvals
The final -05 option corresponds to the multiple-approval configuration, including CSA, ATEX, and IECEx approvals. This can be an important selection criterion for appropriately engineered hazardous-area installations.
Direct Shaft Measurement
The probe provides direct information about rotor movement, allowing the associated monitoring system to evaluate both static shaft position and dynamic vibration.
Established 3300 XL Platform
The 330191 works within the established 3300 XL 8 mm proximity architecture. Compatible 3300 XL components can provide a practical modular arrangement consisting of probe, extension cable, and Proximitor Sensor.
Technical FAQs
1. What is the Bently Nevada 330191-00-33-90-05?
It is a 3300 XL 8 mm Extended Temperature Range proximity probe with a 3/8-24 UNF thread, non-armored construction, 3.3-inch case length, 9 m cable configuration, and multiple approvals.
2. Is the 330191 a Proximitor Sensor?
No. The 330191 is the physical proximity probe. A compatible Proximitor Sensor is required to condition the probe signal and complete the transducer system.
3. What does ETR mean?
ETR stands for Extended Temperature Range. The probe is designed for applications where elevated operating temperatures make the use of standard-temperature proximity probes unsuitable.
4. What does the first 00 mean?
In 330191-00-33-90-05, the first 00 identifies an unthreaded length of 0.0 inch. The 330191 ordering structure permits the unthreaded length to be selected in 0.1-inch increments.
5. What does 33 represent?
The 33 specifies a 3.3-inch overall case length, equivalent to approximately 83.82 mm.
6. What does 90 mean?
The 90 identifies the 9.0 m (29.5 ft) total-length configuration.
7. What does the final 05 indicate?
The final 05 identifies the multiple-approval configuration, associated with CSA, ATEX, and IECEx approvals.
8. What thread does the probe use?
The 330191 series uses a 3/8-24 UNF-2A thread. The 330193/330194 families provide the corresponding M10 × 1 metric alternatives.
9. How long is the probe cable?
This configuration uses a 9.0 m (29.5 ft) total-length option. The cable arrangement should be matched with the appropriate Proximitor and system configuration rather than selected independently.
10. What should be checked before ordering a replacement?
Confirm the complete 330191-00-33-90-05 configuration, including the 3/8-24 UNF thread, zero unthreaded length, 3.3-inch case, 9 m system length, connector/cable arrangement, approval requirements, and compatibility with the installed Proximitor Sensor. Proper thread engagement should also be verified; excessive engagement can cause installation problems.
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