Introduction
The Bently Nevada 330704-000-060-90-02-00 is a 3300 XL 11 mm proximity probe designed for reliable, non-contact measurement of shaft position and vibration on rotating machinery. This configuration combines an M14 x 1.5 metric thread, armored construction, 60 mm overall case length, 9.0 m integral cable, and miniature coaxial ClickLoc connector with standard cable.
The 3300 XL 11 mm platform is intended for applications where a longer sensing range is desirable compared with the standard 8 mm system. Its nominal 4 mm (160 mil) linear range makes it particularly suitable for axial or thrust position measurements, differential-expansion monitoring on steam turbines, compressor rod-position applications, tachometer and zero-speed measurements, and Keyphasor phase-reference signals.
For maintenance teams, the detailed configuration of this part number is just as important as the 11 mm probe size itself. The 60 mm case length distinguishes this model from shorter 330704 configurations, while the 9 m cable provides additional flexibility when the probe must be installed some distance from the associated Proximitor Sensor.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-060-90-02-00 |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Probe Model | 330704 |
| Probe Tip Size | 11 mm |
| Mounting Thread | M14 x 1.5 |
| Probe Construction | Armored |
| Unthreaded Length | 0 mm |
| Overall Case Length | 60 mm |
| Integral Cable Length | 9.0 m (29.5 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Agency Approval | 00 – Not required |
| Measurement Principle | Non-contact eddy-current sensing |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Nominal Linear Range | 4 mm (160 mils) |
| Recommended Nominal Gap | 2.5 mm (100 mils) |
| Frequency Response | 0 to 8 kHz, typical +0/-3 dB |
| Minimum Flat Target Diameter | 30.5 mm (1.2 in) |
| Recommended Minimum Shaft Diameter | 152 mm (6.0 in) |
| Typical Measurements | Radial vibration, radial position, axial position, Keyphasor |
| Probe Case Material | Stainless steel |
| Cable Protection | Stainless-steel armor with FEP outer jacket |
| Typical Probe Temperature Range | -52°C to +177°C |
| Approximate Bare Probe Weight | Approximately 0.16–0.17 kg, depending on configuration reference |
| Typical Shipping Weight | Approximately 2 kg, depending on packaging |
Applications
Steam Turbine Monitoring
The 3300 XL 11 mm system is well suited to turbine applications requiring additional measurement range. It can support axial or thrust position and ramp differential-expansion measurements, providing valuable rotor-position information for critical turbine trains.
Radial Shaft Vibration
When installed with the correct target geometry, the probe provides non-contact shaft displacement information for radial vibration monitoring. This makes it useful for continuous observation of high-value rotating equipment.
Compressor Rod Position
The 11 mm platform can be applied to rod-position and rod-drop measurements on reciprocating compressors, particularly where the extended linear range of the system is beneficial.
Axial Position Measurement
The larger 11 mm sensing configuration provides a nominal 4 mm linear range, making it a practical choice for axial displacement applications where additional measurement travel is needed.
Keyphasor and Speed Reference
The probe can be incorporated into compatible systems for Keyphasor phase-reference, tachometer, and zero-speed measurements. This allows the same transducer family to support both vibration and rotational-reference functions.
Large Machinery Installations
The 9 m integral cable is useful in installations where the sensing location is separated from the monitoring electronics. Turbine halls, compressor trains, generators, and other large industrial machines can benefit from this extended cable configuration.
Machinery Protection and Condition Monitoring
When integrated with the appropriate 3300 XL 11 mm Proximitor Sensor and monitoring hardware, the probe provides displacement information that can support continuous condition monitoring, alarm functions, diagnostics, and machinery protection strategies.
Advantages
Extended 11 mm Measurement Range
The 3300 XL 11 mm system provides a nominal 4 mm (160 mil) linear range, offering additional sensing capability when the standard 8 mm proximity system does not provide enough reach.
60 mm Case Configuration
The 60 mm case length gives this model a distinct mechanical profile within the 330704 family. This can be important when replacing an existing probe where the installed mounting arrangement has already been engineered around a specific case length.
9 m Integral Cable
The long cable configuration provides practical installation flexibility. It allows the probe to connect to compatible signal-conditioning equipment positioned farther away from the machine without requiring an unnecessarily short integral cable.
Armored Construction
The armored cable helps protect the probe lead against mechanical damage, abrasion, vibration, and demanding routing conditions. This is particularly valuable around large rotating machinery where cable exposure can be difficult to avoid.
Metric M14 x 1.5 Thread
The M14 x 1.5 mounting thread provides a clean metric installation solution and makes the probe suitable for replacement projects using the same 330704 mechanical configuration.
ClickLoc Connector
The miniature coaxial ClickLoc connector provides a secure connection arrangement designed for industrial vibration-monitoring environments. Its locking design helps reduce connection-related problems during long-term operation.
No Special Agency Approval Option
The final 00 option identifies the configuration as having no agency approval requirement. This can make the model appropriate for standard installations where additional approval options are not specified.
Established 3300 XL Platform
The 3300 XL 11 mm system uses a matched probe, extension cable, and Proximitor Sensor architecture. Selecting the intended components together helps maintain predictable electrical characteristics and reliable measurement performance.
Technical FAQs
1. What is the Bently Nevada 330704-000-060-90-02-00?
It is a 3300 XL 11 mm armored proximity probe featuring an M14 x 1.5 metric thread, 60 mm case length, 9 m integral cable, miniature coaxial ClickLoc connector, and the 00 agency-approval option.
2. What does the 330704 model identify?
The 330704 model identifies the 3300 XL 11 mm probe with an M14 x 1.5 thread and armored construction.
3. What does the 060 option mean?
The 060 portion specifies a 60 mm overall case length.
4. How long is the integral cable?
The 90 option specifies a nominal 9.0 m (29.5 ft) cable length. The manufacturer specifies a +20% / -0% length tolerance for probes ordered with 9 m integral cables.
5. What connector is used on this probe?
The 02 option specifies a miniature coaxial ClickLoc connector with standard cable.
6. What does the final 00 indicate?
The 00 agency approval option means no additional agency approval is required for the selected configuration. Installation requirements can still vary according to the application and site.
7. What is the nominal linear range?
The 3300 XL 11 mm system has a nominal 4 mm (160 mil) linear measurement range with a nominal scale factor of 3.94 V/mm (100 mV/mil).
8. What is the recommended probe gap?
The standard reference gap is approximately 2.5 mm (100 mils). Actual probe installation should be established according to the complete transducer-system requirements, target material, shaft dimensions, and machinery design.
9. Can this probe replace a 3300 XL 8 mm probe?
Not automatically. The 3300 XL 11 mm probe belongs to a specific matched transducer system and requires the appropriate 11 mm Proximitor Sensor and compatible extension cable. A complete system compatibility check should be performed before replacement.
10. What should be checked before ordering this model?
Confirm the 330704 probe model, M14 x 1.5 thread, 60 mm case length, 9 m cable, ClickLoc connector, armored construction, agency-approval option, target geometry, probe gap, and compatibility with the installed 3300 XL 11 mm Proximitor Sensor.
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