Introduction
The Bently Nevada 330704-000-030-90-02-00 is a 3300 XL 11 mm proximity probe designed for non-contact measurement of shaft position and vibration in demanding rotating machinery applications. As part of the proven 3300 XL proximity transducer family, it uses an 11 mm probe tip to provide a longer linear sensing range than the standard 8 mm configuration, making it particularly useful when additional measurement reach is required.
This specific configuration features an M14 x 1.5 metric threaded case with stainless-steel armor, a 30 mm overall case length, a 9 m integral cable, and a miniature coaxial ClickLoc connector with standard cable. The armored construction adds mechanical protection for installations where the probe cable may be exposed to vibration, abrasion, or challenging machinery environments.
The 3300 XL 11 mm system is commonly selected for axial position, radial vibration and position, thrust monitoring, Keyphasor reference, and other machinery condition monitoring duties. Its 100 mV/mil nominal scale factor and 0–8 kHz frequency response make it a practical choice for continuous monitoring of critical rotating equipment.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model / Part Number | 330704-000-030-90-02-00 |
| Product Family | 3300 XL |
| Module Type | 11 mm Proximity Probe |
| Probe Model | 330704 |
| Probe Tip Diameter | 11 mm |
| Thread Type | M14 x 1.5 |
| Probe Construction | Armored |
| Overall Case Length | 30 mm |
| Unthreaded Length | 0 mm |
| Integral Cable Length | 9 m |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Linear Measurement Range | 4 mm (160 mil) |
| Frequency Response | 0 to 8 kHz, typical +0/-3 dB |
| Recommended Gap | 2.5 mm (100 mils) |
| Minimum Target Diameter | 30.5 mm (1.2 in) flat target |
| Recommended Minimum Shaft Diameter | 152 mm (6 in) |
| Probe Case Material | AISI 304 stainless steel |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Cable | 75 Ω triaxial, FEP insulated |
| Armor | Flexible AISI 302 stainless steel with FEP outer jacket |
| Typical Probe Weight | Approximately 1.29 kg for the specified 9 m armored configuration |
| Minimum Bend Radius | 25.4 mm (1.0 in) |
| Probe Temperature Range | -52°C to +177°C |
| Measurement Type | Non-contacting vibration and displacement |
| Typical Power Supply for System | -17.5 to -26 Vdc |
Applications
The 330704-000-030-90-02-00 is well suited to machinery where reliable proximity measurement is important for condition monitoring and protective shutdown strategies.
Typical applications include:
- Steam turbine monitoring — axial position and differential expansion measurements where extended sensing range is beneficial.
- Turbo-machinery vibration monitoring — continuous radial vibration and shaft-position measurements.
- Compressor monitoring — rod position and rod-drop measurement on reciprocating compressors.
- Thrust position monitoring — detection of axial shaft movement in critical rotating machinery.
- Keyphasor applications — phase-reference and rotational-speed measurements.
- Machinery protection systems — integration with compatible Bently Nevada monitoring equipment for continuous machine condition assessment.
- Industrial rotating equipment — applications requiring a robust metric-threaded, armored proximity probe.
For installations where the probe is exposed to mechanical wear or cable movement, the armored construction can provide an additional level of physical protection compared with an unarmored probe configuration.
Advantages
Extended Measurement Capability
The 11 mm sensing tip provides a longer linear sensing range than the standard 8 mm 3300 XL configuration. This can be particularly valuable for axial-position and differential-expansion measurements where additional measurement range is desirable.
Durable Armored Construction
The armored cable uses flexible stainless-steel protection with an FEP outer jacket. This construction helps protect the probe lead against mechanical damage in demanding industrial installations.
Secure ClickLoc Connection
The miniature coaxial ClickLoc connector is designed to lock into position, helping prevent unintended loosening caused by machinery vibration.
Long 9 m Cable Configuration
The integrated 9 m cable provides installation flexibility when the probe must be located at the machine while the associated Proximitor Sensor or monitoring equipment is installed farther away.
Proven 3300 XL Platform
The 3300 XL family is widely used for non-contact displacement and vibration measurement. Selecting a probe from this platform can simplify the design of machinery monitoring systems built around compatible Bently Nevada components.
Metric Installation
The M14 x 1.5 thread makes this configuration a practical choice for machinery installations designed around metric mounting hardware.
Technical FAQs
1. What is the Bently Nevada 330704-000-030-90-02-00?
It is a Bently Nevada 3300 XL 11 mm proximity probe with an M14 x 1.5 threaded case, armored construction, 30 mm case length, and 9 m integral cable.
2. What does the 330704 model designation represent?
330704 identifies the 3300 XL 11 mm proximity probe configuration with an M14 x 1.5 metric thread and armor.
3. What is the probe tip diameter?
The sensing tip is part of the 3300 XL 11 mm probe design and has an approximately 11 mm tip diameter.
4. How long is the cable on 330704-000-030-90-02-00?
This particular configuration has a 9 m integral probe cable.
5. What type of thread does this probe use?
The probe uses an M14 x 1.5 metric thread, making it suitable for compatible metric mounting arrangements.
6. What is the recommended probe gap?
The standard recommended gap for the 3300 XL 11 mm system is approximately 2.5 mm (100 mils) when used under the specified reference conditions.
7. What measurements can this proximity probe perform?
It can be used for non-contact measurements including radial vibration, radial position, axial position, and Keyphasor-related applications when installed as part of a compatible 3300 XL transducer system.
8. Can the probe be used by itself?
The probe is a component of the 3300 XL 11 mm Proximity Transducer System. Proper operation requires the appropriate compatible extension/proximitor and monitoring arrangement rather than treating the probe as a standalone measuring instrument.
9. What is the operating temperature range of the probe?
The published probe operating and storage range is approximately -52°C to +177°C. Installation conditions should nevertheless be evaluated carefully, particularly where the probe seal may be exposed to very low temperatures.
10. What should be considered when replacing an existing proximity probe?
The replacement should match the required probe series, thread, cable length, connector/cable configuration, mechanical dimensions, and monitoring-system compatibility. When upgrading from another Bently Nevada transducer family, the complete transducer-system compatibility should be checked rather than replacing only the probe.
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