Introduction
The Bently Nevada 330704-000-050-90-02 is a 3300 XL 11 mm proximity probe configured for demanding rotating-equipment monitoring applications. It combines an M14 x 1.5 metric thread, armored construction, 50 mm overall case length, 9.0 m integral cable, and miniature coaxial ClickLoc connector with standard cable.
As part of the 3300 XL 11 mm Proximity Transducer System, this probe is intended for non-contact measurement of shaft vibration and displacement. The 11 mm sensing design provides a nominal 4 mm (160 mil) linear range, making it especially useful in applications where the standard 8 mm system does not provide sufficient measurement reach. Typical applications include axial position, radial vibration and position, turbine differential-expansion measurements, rod position, tachometer, and Keyphasor functions.
The 9 m cable makes this particular configuration attractive for installations where the probe is located a considerable distance from the associated Proximitor Sensor. For replacement work, matching the complete configuration—including thread, case length, cable length, connector and armor—is important for maintaining the intended installation geometry and system compatibility.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-050-90-02 |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Probe Model | 330704 |
| Probe Tip | 11 mm |
| Thread | M14 x 1.5 |
| Construction | Armored |
| Unthreaded Length | 0 mm |
| Overall Case Length | 50 mm |
| Integral Cable Length | 9.0 m (29.5 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Agency Approval Option | 00 – Not required |
| Measurement Principle | Eddy-current, non-contact displacement |
| Nominal Scale Factor | 100 mV/mil (3.94 V/mm) |
| 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 Target Diameter | 30.5 mm (1.2 in) flat target |
| Recommended Minimum Shaft Diameter | 152 mm (6 in) |
| Typical Measurements | Vibration, radial position, axial position, Keyphasor |
| Probe Temperature Range | -52°C to +177°C |
| Typical Probe Cable Construction | Armored stainless-steel protection with FEP outer jacket |
| Approximate Assembly Weight | Approximately 1.29 kg |
| Typical System | 3300 XL 11 mm Proximity Transducer System |
Applications
Steam Turbine Monitoring
The 3300 XL 11 mm system is particularly valuable for turbine applications requiring longer-range displacement measurement. It can support axial/thrust position and ramp differential-expansion measurements, helping monitoring systems track important rotor movements.
Radial Shaft Vibration
Installed at the appropriate radial position, the probe provides non-contact shaft displacement information for machinery vibration monitoring. This makes it suitable for critical rotating assets where direct shaft movement data is an important part of the protection strategy.
Compressor Monitoring
The 11 mm system can be used for rod position and rod-drop measurements on reciprocating compressors, as well as other compatible compressor-monitoring duties.
Axial Position Measurement
The extended linear range of the 11 mm system makes it a strong choice for axial-position applications where an 8 mm probe may not offer sufficient measurement range.
Tachometer and Keyphasor Functions
The probe can also be incorporated into tachometer, zero-speed, and phase-reference applications when configured as part of the appropriate 3300 XL transducer system.
Long-Distance Probe Installations
With its 9 m integral cable, this particular model is useful where the sensing point and Proximitor Sensor cannot be positioned close together. The long cable can help simplify routing in large turbine halls, compressor installations, and other distributed machinery-monitoring layouts.
Advantages
Extended 11 mm Measurement Range
The 11 mm probe system offers a nominal 4 mm linear range, providing additional measurement reach compared with the standard 8 mm 3300 XL system. This is one of the primary reasons engineers select the 11 mm platform for specialized displacement applications.
9 m Integral Cable
The 9 m cable configuration gives maintenance and installation teams greater flexibility when the monitoring electronics are installed away from the machine casing. It can reduce the need for additional cable joints in appropriately designed installations.
Robust Armored Construction
The armored probe cable provides additional mechanical protection in environments where vibration, abrasion, and difficult cable routing are concerns. The 3300 XL construction also incorporates CableLoc technology designed to provide a strong connection between the probe cable and sensing assembly.
Secure ClickLoc Connection
The miniature coaxial ClickLoc connector is designed to lock into position, reducing the likelihood of an unintended connection loosening under continuous machinery vibration.
Metric M14 x 1.5 Mounting
The M14 x 1.5 thread provides a practical metric mounting solution for compatible machinery and replacement installations.
Proven Industrial Platform
The 3300 XL 11 mm system combines the probe, extension cable, and Proximitor Sensor into a matched transducer architecture. This makes the platform a practical choice for machinery-monitoring projects where stable displacement measurement and long-term serviceability are priorities.
Technical FAQs
1. What is the Bently Nevada 330704-000-050-90-02?
It is a 3300 XL 11 mm armored proximity probe with an M14 x 1.5 metric thread, 50 mm case length, 9 m integral cable, and miniature coaxial ClickLoc connector.
2. What is the cable length of this probe?
This configuration has a 9.0 m (29.5 ft) integral cable. The 9 m option is specifically identified in the 3300 XL 11 mm ordering structure.
3. What does 330704 identify?
330704 identifies the metric M14 x 1.5, armored version of the 3300 XL 11 mm proximity probe family.
4. What does the 050 configuration mean?
The 050 option specifies a 50 mm overall case length for the metric probe configuration.
5. What does the 90 configuration represent?
The 90 option identifies a 9.0 m total probe cable length.
6. What connector is used?
The 02 option specifies a miniature coaxial ClickLoc connector with standard cable.
7. What is the nominal linear range?
The 3300 XL 11 mm system has a nominal 4 mm (160 mil) linear measurement range and a nominal output scale factor of 3.94 V/mm (100 mV/mil).
8. What is the recommended probe gap?
The reference installation gap for the 3300 XL 11 mm system is approximately 2.5 mm (100 mils) under the specified system test conditions. Actual installation should follow the requirements of the complete transducer system.
9. Can this probe be used with a 3300 XL 8 mm Proximitor Sensor?
No. The 3300 XL 11 mm system is a matched transducer platform consisting of the 11 mm probe, appropriate extension cable, and 11 mm Proximitor Sensor. The 11 mm system should not simply be mixed with 8 mm system components.
10. What should be checked when replacing this probe?
Confirm the 330704 model, M14 x 1.5 thread, 50 mm case length, 9 m cable, 02 connector configuration, armored construction, and compatibility with the associated 3300 XL 11 mm Proximitor Sensor. For critical installations, also verify target material, shaft diameter, probe gap, cable routing, and applicable installation requirements.
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