Introduction
The Bently Nevada 330191-02-10-10-05 is a 3300 XL 8 mm Extended Temperature Range (ETR) Proximity Probe designed for direct, non-contact measurement of rotating-shaft position and vibration. It is part of the 3300 XL proximity transducer platform and is intended for demanding machinery applications where dependable rotor measurements and elevated-temperature capability are important.
This configuration uses a 3/8-24 UNF-2A threaded, non-armored probe body. Its compact mechanical configuration combines a 0.2-inch unthreaded section, 1.0-inch case length, 1.0 m cable, and multiple-approval option. The 330191 family is specifically identified as the 3300 XL 8 mm ETR probe without armor.
The model is especially attractive for turbines, compressors, generators, pumps, and other rotating equipment where the sensing point may experience elevated temperatures. Used with the correct Proximitor Sensor, the probe becomes part of a complete 3300 XL shaft-monitoring channel.
Technical Specifications
The 330191-02-10-10-05 follows the standard AA-BB-CC-DD ordering structure for 3300 XL ETR probes. In this configuration, 02 represents a 0.2-inch unthreaded length, 10 represents a 1.0-inch case length, the second 10 specifies a 1.0 m total cable length, and 05 identifies the multiple-approval option.
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 330191-02-10-10-05 |
| Product Type | 3300 XL 8 mm ETR Proximity Probe |
| Probe Family | 330191 |
| Construction | Non-armored |
| Thread | 3/8-24 UNF-2A |
| Probe Tip Diameter | 8.0 mm (0.31 in) |
| Unthreaded Length | 0.2 in (5.08 mm) |
| Overall Case Length | 1.0 in (25.4 mm) |
| Cable Length | 1.0 m (3.3 ft) |
| Cable Diameter | Approx. 3.68 mm maximum |
| Connector | Miniature male coaxial ClickLoc |
| Measurement Principle | Eddy-current, non-contact |
| Primary Measurement | Shaft vibration and shaft position |
| Additional Uses | Keyphasor reference and speed measurement |
| Temperature Design | Extended Temperature Range |
| Approval Option | Multiple Approvals |
| Approval Package | CSA, ATEX, IECEx |
| Probe Weight Specification | 323 g/m |
| Typical Complete System Weight | Approx. 0.7 kg |
| Mounting | Threaded machinery installation |
Applications
Steam and Gas Turbines
The 330191 ETR probe is well suited to turbine monitoring where the sensing location can be exposed to elevated temperatures. Direct shaft measurements can provide valuable information about rotor vibration and axial or radial position.
Industrial Compressors
In centrifugal compressors and similar rotating machines, the probe can be used to monitor shaft movement and support machinery-protection strategies.
Generators
The probe can be incorporated into generator shaft-monitoring systems where direct rotor displacement measurements are required for reliable condition assessment.
Pumps and Motors
For critical pumps and motors, proximity measurement can complement conventional casing-vibration instrumentation by providing direct information from the rotating shaft.
Fluid-Film Bearing Machines
The 3300 XL 8 mm system is particularly useful on machines using fluid-film bearings because the proximity probe measures rotor movement directly rather than relying exclusively on casing response.
Keyphasor Applications
With a suitable target arrangement and compatible monitoring hardware, the proximity system can provide a rotational reference signal for phase analysis, speed measurement, and other machinery-monitoring functions.
High-Temperature Machinery
The ETR design makes the 330191 series an attractive choice when the probe installation is exposed to temperatures beyond the preferred operating range of standard-temperature proximity probes.
Advantages
Extended Temperature Range Design
The principal advantage of the 330191 series is its ETR construction. It is engineered for applications where the proximity probe must operate in a higher-temperature environment, making it a strong choice for demanding rotating machinery.
Compact Mechanical Configuration
With only a 1.0-inch case length and 0.2-inch unthreaded section, the 330191-02-10-10-05 is well suited to installations where mounting space is limited.
1.0 m Cable
The integrated 1.0 m cable provides a convenient connection to the associated monitoring hardware while keeping the overall probe assembly compact.
3/8-24 UNF Thread
The 3/8-24 UNF-2A mounting thread provides a secure mechanical connection for compatible English-threaded machinery installations.
Non-Contact Measurement
Eddy-current sensing allows the probe to measure shaft movement without physically touching the rotating target. This eliminates normal probe-tip contact wear and supports continuous monitoring.
Multiple Approvals
The -05 configuration corresponds to the multiple-approval option, including CSA, ATEX, and IECEx approvals. This makes the configuration suitable for appropriately engineered installations requiring these certification packages.
Direct Rotor Measurement
Because the probe observes the shaft directly, it can provide meaningful information about rotor displacement and vibration that may not be apparent from casing measurements alone.
3300 XL Compatibility
The 330191 is part of the established 3300 XL 8 mm transducer architecture and can be paired with compatible Proximitor Sensors and associated system components.
Easy Configuration Identification
The detailed part number clearly defines the mechanical and electrical configuration, which is valuable when replacing an existing probe and attempting to preserve the original system characteristics.
Practical Choice for Critical Equipment
For machinery where vibration and shaft position are important operating parameters, the 330191-02-10-10-05 offers a compact ETR solution with a proven 8 mm sensing format.
Technical FAQs
1. What is the Bently Nevada 330191-02-10-10-05?
It is a 3300 XL 8 mm Extended Temperature Range proximity probe with a 3/8-24 UNF thread, non-armored construction, 0.2-inch unthreaded length, 1.0-inch case length, 1.0 m cable, and multiple approvals.
2. Is the 330191-02-10-10-05 a Proximitor Sensor?
No. It is the physical proximity probe. A compatible Proximitor Sensor is required to condition its signal and complete the transducer system.
3. What does ETR mean?
ETR means Extended Temperature Range. The 330191 family is designed for higher-temperature proximity measurement applications compared with standard 3300 XL probe configurations.
4. What does the first 02 represent?
The first 02 identifies a 0.2-inch unthreaded length, equivalent to approximately 5.08 mm. The ordering system allows unthreaded length to be selected in 0.1-inch increments, subject to the required relationship with case length.
5. What does the second 10 represent?
The second 10 identifies a 1.0-inch overall case length, equivalent to approximately 25.4 mm.
6. What does the third 10 indicate?
The third 10 specifies a 1.0 m (3.3 ft) total cable-length option. The 3300 XL ordering system provides several cable-length choices, including 0.5 m, 1 m, 1.5 m, 2 m, 5 m, and 9 m configurations.
7. What does the final 05 mean?
The final 05 identifies the multiple-approval configuration, associated with CSA, ATEX, and IECEx approvals.
8. What is the probe tip diameter?
The 3300 XL 8 mm probe has an 8.0 mm (0.31-inch) sensing tip diameter.
9. How much does the probe weigh?
The published specification lists the 3300 XL probe at approximately 323 g/m (11.4 oz). For a complete transducer system, typical total weight is approximately 0.7 kg, depending on the complete probe, cable, and Proximitor configuration.
10. What should be checked before ordering a replacement?
Confirm the complete 330191-02-10-10-05 configuration, including the 3/8-24 UNF thread, 0.2-inch unthreaded length, 1.0-inch case length, 1.0 m cable, connector type, ETR requirement, and required approvals. The associated Proximitor Sensor must also be compatible with the selected system length and probe configuration.
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