Introduction
The Bently Nevada 330706-005-046-10-02-05 is a 3300 XL 11 mm Reverse Mount Probe developed for non-contact measurement of shaft vibration, displacement, and position on critical rotating machinery.
Unlike the standard-mount 330704 family, the 330706 is specifically designed with an M10 x 1 reverse-mount thread. The reverse-mount arrangement is valuable where access to the sensing location is restricted or where the probe must be installed from the opposite side of a mounting bracket or machine component.
This configuration combines a 5 mm unthreaded length, 46 mm overall case length, 1.0 m integral cable, miniature ClickLoc coaxial connector, and multiple approvals. The 3300 XL 11 mm platform is particularly well suited to demanding measurements such as axial thrust position, differential expansion, rod position, rod drop, vibration, and Keyphasor applications.
For maintenance and replacement work, the complete part number is important. The reverse-mount geometry, M10 x 1 thread, 46 mm case length, cable length, connector, and approval configuration should all be matched to the original installation.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330706-005-046-10-02-05 |
| Product Family | 3300 XL |
| Product Type | 11 mm Reverse Mount Proximity Probe |
| Probe Model | 330706 |
| Sensing Diameter | 11 mm |
| Mounting Type | Reverse Mount |
| Mounting Thread | M10 x 1 |
| Unthreaded Length | 5 mm |
| Overall Case Length | 46 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Connector Protector | Not available with reverse-mount configuration |
| Armored Cable | Not available with reverse-mount configuration |
| FluidLoc Cable | Not available with reverse-mount configuration |
| Agency Approval | Multiple Approvals |
| Measurement Principle | Non-contact eddy-current |
| Nominal Linear Range | Approximately 4 mm (160 mils) |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Typical Nominal Gap | Approximately 2.5 mm (100 mils) |
| Typical Applications | Vibration, axial position, radial position, Keyphasor, rod position |
| Probe Tip Material | PPS |
| Probe Body | Stainless steel |
| Cable Insulation | FEP |
| Approximate Probe Weight | Approximately 0.05–0.07 kg |
| Typical Packed / Shipping Weight | Approximately 1 kg, packaging dependent |
| Operating Temperature | Approximately -52°C to +177°C |
Applications
Axial Thrust Position Monitoring
The 3300 XL 11 mm system is well suited to axial-position measurement on turbines and other rotating machines. Its extended measurement capability allows engineers to monitor shaft movement relative to a defined reference position.
Differential Expansion
The probe can be used in suitable differential-expansion arrangements to monitor relative movement between rotating and stationary machine components.
Turbine Vibration Monitoring
Steam and gas turbines can use compatible 3300 XL 11 mm transducer systems for continuous shaft-vibration monitoring and machinery protection.
Compressor Monitoring
The probe is suitable for compatible compressor applications where shaft displacement, vibration, or position must be monitored continuously.
Rod Position and Rod Drop
The extended-range 11 mm platform is particularly useful for reciprocating machinery applications involving rod position and rod-drop measurement, where sufficient linear measurement range is important.
Keyphasor Reference
When correctly integrated into a complete monitoring system, the probe can provide a phase-reference signal for Keyphasor applications, supporting synchronous vibration analysis and rotor diagnostics.
Tachometer and Speed Measurement
The proximity sensing principle can also support rotational-speed measurement in appropriate installations.
Restricted-Access Machinery Locations
The reverse-mount design is the defining mechanical advantage of this model. It allows installation in locations where a conventional probe cannot easily be inserted from the normal direction.
Advantages
Purpose-Built Reverse Mounting
The M10 x 1 reverse-mount configuration provides greater installation flexibility than conventional standard-mount probes. It is particularly useful in confined machinery housings and mounting arrangements with limited front-side access.
Compact 46 mm Case
The 46 mm case length provides a compact mechanical footprint while retaining the capabilities of the 3300 XL 11 mm sensing platform.
Extended 11 mm Measurement Range
The 11 mm sensing design offers a nominal 4 mm linear range, making it attractive for displacement measurements involving relatively large shaft movement.
5 mm Unthreaded Section
The 5 mm unthreaded length provides a defined installation geometry that should be matched carefully when replacing an existing reverse-mount probe.
1 m Integral Cable
The 1.0 m integral cable offers a practical connection length for installations where the associated Proximitor Sensor is positioned nearby.
ClickLoc Connector
The miniature coaxial ClickLoc connector provides a reliable connection interface for the compatible 3300 XL transducer system.
Multiple Approvals
The 05 suffix identifies the multiple-approval configuration, making this version suitable for projects requiring specified agency approvals.
High-Temperature Capability
The 3300 XL 11 mm reverse-mount platform is designed for demanding industrial environments, with a broad operating-temperature capability appropriate for many turbine and process-machinery installations.
Designed for Critical Machinery
The probe is intended for use as part of a complete machinery-monitoring system rather than as a standalone sensor. When correctly paired with the appropriate Proximitor Sensor and extension cable, it provides a dependable measurement path for critical rotating equipment.
Technical FAQs
1. What is the Bently Nevada 330706-005-046-10-02-05?
It is a 3300 XL 11 mm Reverse Mount Proximity Probe with an M10 x 1 thread, 5 mm unthreaded length, 46 mm case length, 1 m cable, ClickLoc connector, and multiple approvals.
2. What makes the 330706 different from the 330704?
The 330706 is a reverse-mount probe with an M10 x 1 thread, while the 330704 is a standard-mount 11 mm probe using an M14 x 1.5 metric thread. The two should not be treated as mechanically interchangeable.
3. What does the 005 option specify?
The 005 option identifies a 5 mm unthreaded length in the reverse-mount probe configuration.
4. What does the 046 option mean?
The 046 option identifies the 46 mm overall case length.
5. How long is the integral cable?
The 10 option specifies a 1.0 m (3.3 ft) integral cable.
6. What connector does this probe use?
The 02 option specifies a miniature coaxial ClickLoc connector with standard cable.
7. Does this reverse-mount probe have armor or FluidLoc cable?
No. The reverse-mount configuration is not offered with the standard-mount armor, FluidLoc cable, or connector-protector options. The 02 configuration uses the standard cable arrangement.
8. What is the nominal measurement range?
The 3300 XL 11 mm system provides a nominal 4 mm (160 mil) linear range with a nominal scale factor of approximately 3.94 V/mm (100 mV/mil).
9. What is the approximate weight?
The bare probe assembly is approximately 0.05–0.07 kg, depending on the specific measurement method and product configuration. Packed shipping weight is considerably higher and may be around 1 kg.
10. Can the 330706-005-046-10-02-05 directly replace a standard 330704 probe?
No. The mounting geometry is different. The 330706 uses an M10 x 1 reverse-mount arrangement, while the standard 330704 uses an M14 x 1.5 mounting configuration. Before replacement, confirm the mounting direction, thread, case dimensions, cable length, connector type, and approval requirements.
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