Introduction
The Bently Nevada 330709-000-030-50-12-00 is a 3300 XL 11 mm Proximity Probe designed for non-contact measurement of shaft vibration, radial position, axial position, and other displacement-related parameters on critical rotating machinery.
This configuration combines the M16 x 1.5 metric mounting thread of the 330709 family with a 30 mm case length, 5.0 m integral cable, and miniature coaxial ClickLoc connector with FluidLoc cable. The 330709 series is the unarmored M16 x 1.5 version of the 3300 XL 11 mm standard-mount probe family.
The 5 m cable is the key feature of this particular part number. It provides considerably more installation flexibility than 1 m configurations, while the FluidLoc cable construction is intended for applications where enhanced resistance to harsh fluids and environments is desirable. Bently Nevada specifies that 5 m probes are designed for use with the corresponding 5 m Proximitor Sensor.
For plants maintaining turbines, compressors, generators, motors, and other high-value rotating assets, this configuration offers a practical combination of compact probe geometry, metric mounting, extended cable reach, and established 3300 XL eddy-current measurement technology.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330709-000-030-50-12-00 |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Probe Series | 330709 |
| Mounting Type | Standard Mount |
| Sensing Diameter | 11 mm |
| Mounting Thread | M16 x 1.5 |
| Construction | Unarmored |
| Unthreaded Length | 0 mm |
| Overall Case Length | 30 mm |
| Integral Cable Length | 5.0 m (16.4 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | FluidLoc |
| Connector Protector | Not included |
| Agency Approval | 00 – Not required |
| Measurement Principle | Eddy-current, non-contact |
| Nominal Linear Range | 4 mm (160 mils) |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Typical Frequency Range | 0 to 8 kHz |
| Typical Measurements | Radial vibration, radial position, axial position, Keyphasor |
| Cable Jacket | FEP / FluidLoc construction |
| Probe Housing | Stainless steel |
| Approximate Probe Weight | Lightweight sensor assembly |
| Cable Length Tolerance | +20%, -0% for 5 m integral cable |
Applications
Turbine Vibration Monitoring
The 3300 XL 11 mm system is well suited to critical turbine applications requiring continuous, non-contact measurement of shaft vibration and displacement.
Compressor Monitoring
The probe can be integrated into compatible compressor monitoring systems for radial vibration, shaft position, and other displacement measurements.
Generator and Motor Applications
Large rotating electrical machines can use proximity probes to monitor shaft movement without making physical contact with the rotating target.
Axial Position Measurement
The 11 mm system provides a nominal 4 mm linear range, making it suitable for compatible axial-position and thrust-related measurements.
Keyphasor Measurement
Suitable 3300 XL 11 mm installations can use the probe as part of a Keyphasor arrangement for phase reference and rotational-speed-related measurements.
Long-Distance Probe-to-Sensor Installations
The 5 m integral cable is particularly useful when the sensing point is located some distance from the Proximitor Sensor. It reduces the need for a separate short probe plus an additional extension arrangement in installations designed around the 5 m system.
Harsh Industrial Environments
The FluidLoc cable configuration is useful where cable resistance to fluids is an important consideration. This gives the 330709-000-030-50-12-00 a practical advantage over standard-cable configurations in demanding installations.
Metric Machinery Installations
The M16 x 1.5 mounting thread makes this model a natural fit for compatible metric machinery and mounting hardware.
Advantages
5 m Extended Cable
The most obvious advantage is the 5.0 m integral cable. It offers considerably greater installation freedom than the 1 m version and can be valuable when the Proximitor Sensor needs to be located away from the measurement point.
FluidLoc Cable Construction
The 12 configuration uses FluidLoc cable, adding a useful level of environmental resistance for industrial applications where exposure to oil, fluids, or other potentially aggressive substances needs to be considered.
Compact 30 mm Probe Body
Although the cable is long, the probe itself remains compact with a 30 mm case length, making it suitable for installations with limited physical space around the sensing location.
Metric M16 x 1.5 Mounting
The M16 x 1.5 thread provides a secure metric mounting solution and distinguishes this probe from the M14 x 1.5 and imperial 3300 XL 11 mm configurations.
11 mm Extended-Range Sensing
The 3300 XL 11 mm system provides a nominal 4 mm (160 mil) linear range and 3.94 V/mm (100 mV/mil) scale factor. The larger sensing tip is intended for applications where the reach of an 8 mm system may not be sufficient.
Non-Contact Measurement
Eddy-current sensing allows continuous shaft measurement without physical contact, helping eliminate sensor wear at the rotating measurement interface.
ClickLoc Connector
The miniature coaxial ClickLoc connector provides a compact connection to compatible 3300 XL system components.
Practical Replacement Configuration
When an existing installation already uses a 330709 probe with a 5 m FluidLoc arrangement, this exact configuration can help maintain the established mechanical and electrical setup without unnecessarily changing the system architecture.
Designed for the 5 m Proximitor System
Bently Nevada specifically notes that 5 m probes are designed for use with the 5 m Proximitor Sensor, an important consideration when planning a replacement or new installation.
Technical FAQs
1. What is the Bently Nevada 330709-000-030-50-12-00?
It is a 3300 XL 11 mm standard-mount proximity probe with an M16 x 1.5 thread, 30 mm case, 5 m integral FluidLoc cable, and miniature ClickLoc connector.
2. What does the 330709 model number indicate?
330709 identifies the 3300 XL 11 mm probe with an M16 x 1.5 thread and unarmored construction.
3. What does 000 mean?
The 000 option specifies a 0 mm unthreaded length. For metric probes, unthreaded length is ordered in 2 mm increments.
4. What does 030 specify?
The 030 option identifies a 30 mm overall case length.
5. How long is the cable?
The 50 option specifies a nominal 5.0 m (16.4 ft) integral cable. Bently Nevada specifies a +20%, -0% cable-length tolerance for 5 m and 9 m integral-cable probes.
6. What type of cable does the 12 option use?
The 12 option specifies a miniature coaxial ClickLoc connector with FluidLoc cable.
7. Does this model have a connector protector?
No. The 12 configuration uses the ClickLoc connector with FluidLoc cable but does not include the connector-protector option. The 11 configuration adds the connector protector to the FluidLoc arrangement.
8. Is the 330709-000-030-50-12-00 armored?
No. The 330709 family is the unarmored M16 x 1.5 configuration. The corresponding armored M16 x 1.5 family is 330710.
9. What is the nominal measurement range?
The 3300 XL 11 mm system provides a nominal 4 mm (160 mil) linear sensing range, with a nominal scale factor of 3.94 V/mm (100 mV/mil).
10. Can it use a standard 1 m Proximitor Sensor?
The 5 m probe configuration requires attention to the corresponding system configuration. Bently Nevada specifies that 5 m probes are designed for use with the 5 m Proximitor Sensor, so a standard 1 m arrangement should not be assumed to be interchangeable.
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