Introduction
The Bently Nevada 330704-000-078-10-01-05 is a metric 3300 XL 11 mm proximity probe developed for precise, non-contact measurement of shaft displacement and vibration in demanding rotating-equipment applications. As part of the 3300 XL 11 mm family, it combines the proven eddy-current sensing principle with a robust armored probe construction for industrial machinery environments.
This configuration uses an M14 x 1.5 metric thread, 78 mm overall case length, 1.0 m integral cable, and a miniature coaxial ClickLoc connector with connector protector. The final 05 option specifies the multiple-approval configuration, making this version attractive for installations where additional approval requirements are part of the equipment specification.
The 11 mm sensing platform offers a nominal 4 mm (160 mil) linear measurement range, giving users additional measurement capability for shaft-position and vibration applications compared with smaller sensing configurations. The relatively short 1 m cable also makes this probe well suited to installations where the probe and Proximitor Sensor are located close together.
For replacement work, the complete part number should be matched carefully. The 78 mm case length, M14 x 1.5 thread, 1 m cable, connector-protector option, and multiple-approval configuration are all important elements of the specified installation.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-078-10-01-05 |
| 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 | 78 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc |
| Connector Protection | Included |
| Cable Type | Standard cable |
| Agency Approval | 05 – Multiple Approvals |
| Measurement Principle | Non-contact eddy-current sensing |
| Nominal Linear Range | 4 mm (160 mils) |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| 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) |
| Probe Case Material | AISI 304 stainless steel |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Cable Protection | Stainless-steel armor with FEP outer jacket |
| Typical Operating / Storage Temperature | -51°C to +177°C |
| Approximate Product Weight | Approximately 0.07 kg for comparable short armored configurations |
| Typical Shipping Weight | Approximately 1–1.5 kg, depending on packaging |
Applications
Turbine Shaft Monitoring
The 3300 XL 11 mm system is designed for demanding turbine-monitoring applications where reliable shaft displacement information is required. It can support measurements associated with radial vibration, axial position, and other rotor-motion parameters.
Radial Shaft Vibration
The probe's non-contact sensing principle allows it to monitor shaft movement without physical contact with the rotating target. This makes it valuable for continuous vibration monitoring on critical rotating machinery.
Axial Position Measurement
The nominal 4 mm linear range provides useful measurement capability for axial shaft movement and thrust-position monitoring, particularly where a wider sensing range is desirable.
Differential Expansion
The 3300 XL 11 mm platform can be used in compatible steam-turbine differential-expansion measurement arrangements. Accurate displacement information helps operators monitor relative movement between rotor and casing components.
Compressor Monitoring
The probe can form part of a suitable proximity measurement system for compressor applications, including shaft-position monitoring and selected reciprocating-compressor rod-position applications.
Keyphasor and Speed Reference
When correctly integrated into a compatible transducer system, the probe can be used for phase-reference and rotational-speed measurement functions such as Keyphasor and tachometer applications.
Compact Equipment Installations
The 1 m integral cable is particularly useful where the probe and Proximitor Sensor are located close to one another. It provides a cleaner installation than unnecessarily long cable configurations while retaining the sensing characteristics of the 3300 XL 11 mm system.
Advantages
Extended 11 mm Measurement Range
The 3300 XL 11 mm platform provides a nominal 4 mm (160 mil) linear range, giving the system additional measurement capability for displacement-sensitive machinery applications.
78 mm Case Length
The 78 mm overall case provides a specific mechanical configuration for installations requiring this mounting dimension. For replacement projects, matching the original case length can help avoid changes to existing mounting hardware.
Compact 1 m Cable
The 1.0 m integral cable is an excellent fit for compact machinery layouts where the Proximitor Sensor is installed near the probe. It reduces unnecessary cable routing while maintaining the intended transducer architecture.
Armored Probe Construction
The armored design adds mechanical protection to the cable assembly, helping it withstand vibration, abrasion, and demanding industrial routing conditions.
Metric M14 x 1.5 Thread
The M14 x 1.5 mounting thread provides a dedicated metric solution for compatible machinery and makes this model a natural replacement candidate for installations already using the 330704 family.
Connector Protector
Unlike the 02 connector option, the 01 configuration includes a connector protector. This provides additional physical protection around the miniature ClickLoc connection and can be useful in installations where the connector is exposed to mechanical handling or environmental stresses.
Multiple Approvals
The final 05 option identifies the multiple-approval configuration. This gives the probe added flexibility for projects where approved instrumentation is required as part of the equipment specification.
Established 3300 XL Architecture
The 3300 XL 11 mm system uses matched sensing and signal-conditioning components. Correctly pairing the probe with the appropriate Proximitor Sensor and system cable helps maintain consistent measurement performance.
Technical FAQs
1. What is the Bently Nevada 330704-000-078-10-01-05?
It is a Bently Nevada 3300 XL 11 mm metric proximity probe with an M14 x 1.5 thread, armored construction, 78 mm case length, 1 m cable, ClickLoc connector with protector, and multiple approvals.
2. Is this a metric proximity probe?
Yes. The 330704 model uses an M14 x 1.5 metric thread and is the armored metric configuration within the 3300 XL 11 mm probe family.
3. What does the 078 option mean?
The 078 option specifies the 78 mm overall case length.
4. How long is the integral cable?
The 10 option specifies a nominal 1.0 m (3.3 ft) integral cable.
5. What is special about the 01 connector option?
The 01 configuration uses a miniature coaxial ClickLoc connector with a connector protector and standard cable. The protector provides additional mechanical protection around the connection.
6. What does the final 05 indicate?
The 05 option specifies Multiple Approvals. The exact approval applicability should be matched to the requirements of the intended installation.
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 typical reference gap is approximately 2.5 mm (100 mils). Actual installation should be established according to the complete transducer system, target geometry, shaft dimensions, and machinery requirements.
9. Can this probe be used with a 3300 XL 8 mm system?
It should not be considered a direct replacement for an 8 mm probe. The 330704 belongs to the 3300 XL 11 mm system and should be matched with the appropriate Proximitor Sensor and compatible system configuration.
10. What should be verified before purchasing this probe?
Confirm the 330704 model, M14 x 1.5 thread, 78 mm case length, 1 m cable, ClickLoc connector with protector, armored construction, multiple-approval option, target geometry, probe gap, and compatible 3300 XL 11 mm Proximitor Sensor.
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