Introduction
The Bently Nevada 330704-000-060-90-02-CN is a 3300 XL 11 mm proximity probe configured for reliable, non-contact measurement of shaft vibration, radial position, and axial displacement on critical rotating machinery. This metric configuration combines an M14 x 1.5 mounting thread, armored construction, 60 mm case length, 9.0 m integral cable, and miniature coaxial ClickLoc connector.
The 3300 XL 11 mm platform is designed for applications that benefit from a wider measurement range than the conventional 8 mm proximity system. With a nominal 4 mm (160 mil) linear range, the probe is well suited to demanding machinery-monitoring duties including turbine shaft position, differential expansion, compressor rod position, radial vibration, tachometer, and Keyphasor applications.
The CN suffix identifies a country-specific configuration, making the complete part number particularly important when replacing an existing probe or purchasing equipment for a specified installation environment. The 60 mm mechanical configuration also distinguishes this model from shorter 330704 variants.
For maintenance and procurement teams, this is more than simply an 11 mm proximity probe. The exact thread, case length, cable length, connector, armor, and approval configuration should all match the installed system to achieve a dependable replacement.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-060-90-02-CN |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Configuration | Metric |
| Probe Model | 330704 |
| Probe Tip Diameter | 11 mm |
| Mounting Thread | M14 x 1.5 |
| 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 |
| Approval Configuration | CN – Country-Specific Configuration |
| 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 | Approximately 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 |
| Approximate Operating Temperature | -52°C to +177°C |
| Approximate Probe Assembly Weight | About 0.16–0.17 kg before long-cable contribution |
| Typical Shipping Weight | Approximately 2 kg, depending on packaging |
Applications
Steam and Gas Turbine Monitoring
The 3300 XL 11 mm system is suitable for critical turbine applications requiring shaft displacement information. Depending on installation geometry, the system can support axial or thrust-position monitoring and differential-expansion measurements.
Radial Shaft Vibration
The probe provides non-contact measurement of shaft displacement and can be positioned for radial vibration monitoring. This is valuable for machinery where continuous shaft movement data is required for protection and condition assessment.
Compressor Monitoring
The 11 mm platform can support compressor applications involving shaft position and, where appropriately configured, reciprocating-compressor rod-position and rod-drop measurements.
Axial Position
The extended linear range of the 11 mm system makes it a practical option for monitoring axial shaft movement where an 8 mm proximity system may not provide sufficient measurement capability.
Keyphasor and Speed Reference
When incorporated into the appropriate transducer arrangement, the probe can be used for Keyphasor phase reference, tachometer, and zero-speed applications.
Generator and Motor Monitoring
Large generators and motors can benefit from continuous proximity measurement of shaft movement. The non-contact design avoids mechanical contact with the rotating target while providing a useful displacement signal to the monitoring system.
Long-Distance Machinery Installations
The 9 m integral cable is a major advantage where the sensing point and Proximitor Sensor are not located close together. This configuration can simplify routing on large turbine trains, compressors, generators, and other industrial machinery.
Advantages
11 mm Extended Measurement Capability
The 3300 XL 11 mm platform provides a nominal 4 mm linear range, offering additional measurement travel for applications involving larger shaft displacement.
60 mm Mechanical Configuration
The 60 mm case length provides a specific mounting geometry that can be important when replacing an existing 330704 installation. Matching the case length helps avoid unnecessary mechanical modifications.
9 m Integral Cable
The long cable provides useful installation flexibility and can accommodate greater separation between the probe and associated electronics.
Armored Construction
The armored cable design adds mechanical protection in environments exposed to vibration, abrasion, and challenging cable routes. This makes the probe a practical option for demanding industrial installations.
Metric M14 x 1.5 Thread
The M14 x 1.5 metric thread makes this model particularly suitable for machinery and replacement projects designed around metric mounting hardware.
ClickLoc Connector
The miniature coaxial ClickLoc connector provides a secure connection arrangement suitable for machinery-monitoring environments with continuous vibration.
Country-Specific Configuration
The CN suffix identifies a country-specific configuration. This is useful when the procurement specification calls for a particular regional or certification arrangement rather than a standard unapproved configuration.
Proven 3300 XL Platform
The probe is designed as part of the 3300 XL 11 mm proximity transducer system. Using the correct matching Proximitor Sensor and associated cable helps maintain the intended electrical and measurement characteristics.
Technical FAQs
1. What is the Bently Nevada 330704-000-060-90-02-CN?
It is a 3300 XL 11 mm metric proximity probe featuring an M14 x 1.5 thread, armored construction, 60 mm case length, 9 m integral cable, ClickLoc connector, and CN country-specific configuration.
2. Is this probe metric?
Yes. The 330704 model uses an M14 x 1.5 metric mounting thread, making this a metric 3300 XL 11 mm probe.
3. What does the 060 option specify?
The 060 portion of the part number identifies the 60 mm overall case length.
4. What does the 90 option mean?
The 90 option indicates a nominal 9.0 m integral cable length.
5. What connector does the 02 option provide?
The 02 configuration uses a miniature coaxial ClickLoc connector with standard cable.
6. What does CN mean at the end of the part number?
The CN suffix identifies a country-specific configuration. The exact certification or regional requirements should be confirmed against the installation specification before purchase.
7. What is the nominal linear range?
The 3300 XL 11 mm system has a nominal 4 mm (160 mil) linear range and a nominal scale factor of 3.94 V/mm (100 mV/mil).
8. What is the normal probe gap?
A nominal reference gap of approximately 2.5 mm (100 mils) is used for the 3300 XL 11 mm system. Actual installation should be adjusted and verified according to the complete transducer-system requirements.
9. Can this 11 mm probe be connected to an 8 mm Proximitor Sensor?
The 330704 is intended for the 3300 XL 11 mm system. It should not be assumed to be directly interchangeable with 8 mm system components. The matching Proximitor Sensor and cable configuration should be verified before installation.
10. What should be confirmed before ordering this replacement?
Verify the complete configuration: 330704 model, M14 x 1.5 thread, 60 mm case length, 9 m cable, ClickLoc connector, armored construction, CN configuration, target dimensions, probe gap, and compatible 3300 XL 11 mm Proximitor Sensor.
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