Introduction
The Bently Nevada 330704-000-050-90-02-05 is a 3300 XL 11 mm proximity probe designed for non-contact vibration and displacement measurement on critical rotating machinery. This specific configuration combines an M14 x 1.5 metric thread, armored probe construction, 50 mm overall case length, 9.0 m integral cable, miniature coaxial ClickLoc connector, and multiple-approval option.
The 3300 XL 11 mm system is particularly useful where the standard 8 mm proximity system does not provide enough sensing range. Its 11 mm probe tip supports a nominal 4 mm (160 mil) linear measurement range and a nominal output scale factor of 3.94 V/mm (100 mV/mil). Typical applications include axial position, radial vibration and position, steam-turbine differential expansion, compressor rod position, tachometer, zero-speed, and Keyphasor measurements.
For maintenance and replacement projects, the complete part number is especially important. The 330704 model identifies the armored M14 x 1.5 metric probe, while the remaining options define the case length, cable length, connector/cable type, and approval configuration. This makes the 330704-000-050-90-02-05 a focused choice for installations that need a long 9 m probe cable together with multiple approvals.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-050-90-02-05 |
| 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 | 50 mm |
| Integral Cable Length | 9.0 m (29.5 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Agency Approval | 05 – Multiple Approvals |
| 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 | Vibration, radial position, axial position, Keyphasor |
| Probe Temperature Range | -52°C to +177°C |
| Cable Protection | Stainless-steel armor with FEP outer jacket |
| Approximate Bare Probe Weight | About 0.17 kg for the short reference configuration; long armored cable adds substantial weight |
| Typical Shipping Weight | Varies by packaging and supplier |
Applications
Steam Turbine Measurements
The 3300 XL 11 mm system is well suited to applications requiring additional linear sensing range, including axial/thrust position and ramp differential-expansion measurements on steam turbines.
Radial Shaft Vibration
The probe can provide non-contact shaft displacement information for radial vibration monitoring when installed with the appropriate target geometry and system components. This makes it useful for high-value rotating assets where continuous shaft behavior is an important condition indicator.
Compressor Monitoring
For reciprocating compressors, the 11 mm system can be used for rod position and rod-drop measurements. The larger sensing configuration is advantageous where the additional linear range is needed.
Axial Position Monitoring
Axial shaft movement is one of the key applications for the 3300 XL 11 mm system. The longer linear range can provide additional measurement margin in installations where an 8 mm system may not be suitable.
Keyphasor and Speed Measurement
When correctly configured within a compatible transducer system, the probe can be used for phase-reference, tachometer, and zero-speed measurements.
Large Machinery Installations
The 9 m integral cable is especially useful in turbine halls, compressor trains, generators, and other machinery installations where the probe location is physically distant from the Proximitor Sensor.
Advantages
Extended Linear Measurement Range
The 11 mm sensing platform provides a nominal 4 mm linear range, giving it a clear advantage in applications where greater displacement measurement capability is required.
Long 9 m Cable
The integrated 9 m cable allows the probe to reach monitoring electronics located farther from the machine. This can simplify cable routing and reduce the need for additional connection points in appropriately engineered installations.
Robust Armored Design
The probe uses armored construction with stainless-steel protection and an FEP outer jacket. This provides additional mechanical protection in areas exposed to vibration, abrasion, or demanding cable-routing conditions.
Metric M14 x 1.5 Mounting
The M14 x 1.5 threaded body makes this configuration a convenient match for machinery designed around metric mounting hardware. It can also simplify replacement when the existing installation already uses a 330704 probe.
Secure ClickLoc Connection
The miniature coaxial ClickLoc connector provides a positive connection arrangement suitable for machinery environments where continuous vibration can place stress on conventional connections.
Multiple Approval Configuration
The final 05 option specifies the multiple-approval configuration. This is useful for projects where equipment approval requirements are part of the procurement and installation specification. The exact approval applicability should be checked against the current certification documentation and the complete installed system.
Established 3300 XL Architecture
The 3300 XL 11 mm system consists of the probe, matching extension cable, and 11 mm Proximitor Sensor. Keeping these components within the intended system family helps maintain predictable measurement characteristics and simplifies maintenance planning.
Technical FAQs
1. What is the Bently Nevada 330704-000-050-90-02-05?
It is an 11 mm 3300 XL proximity probe with an M14 x 1.5 metric thread, armored construction, 50 mm case length, 9 m integral cable, ClickLoc connector, and multiple-approval configuration.
2. What does 330704 identify?
The 330704 model identifies the metric M14 x 1.5, armored 3300 XL 11 mm proximity probe.
3. What does the 050 option mean?
The 050 portion specifies a 50 mm overall case length for this metric probe configuration.
4. How long is the cable?
The 90 option specifies a nominal 9.0 m (29.5 ft) total cable length. Bently Nevada specifies a +20% / -0% length tolerance for probes ordered with 9 m integral cables.
5. What does the 02 option specify?
The 02 connector/cable option specifies a miniature coaxial ClickLoc connector with standard cable.
6. What does the final 05 indicate?
The 05 agency-approval option indicates Multiple Approvals. The specific approvals applicable to a particular installation should be verified against the relevant approval documentation and site requirements.
7. What is the nominal linear range?
The 3300 XL 11 mm system provides 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 for the 3300 XL 11 mm system is approximately 2.5 mm (100 mils). Actual installation should be established according to the complete transducer-system requirements and target characteristics.
9. Can this probe be connected to a 3300 XL 8 mm Proximitor Sensor?
The 3300 XL 11 mm probe is intended for use with the corresponding 3300 XL 11 mm extension cable and 11 mm Proximitor Sensor. It should not be treated as a drop-in replacement for an 8 mm system simply because both products use proximity measurement technology.
10. What should be verified before ordering a replacement?
Check the probe model, M14 x 1.5 thread, 50 mm case length, 9 m cable, ClickLoc connector, armored construction, approval option, target geometry, probe gap, and compatibility with the existing 3300 XL 11 mm Proximitor Sensor. For critical machinery, confirming the complete transducer-system configuration is preferable to matching only the probe diameter.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
