Introduction
The Bently Nevada 330704-000-080-10-11-00 is a 3300 XL 11 mm armored proximity probe configured for reliable, non-contact measurement of shaft vibration and displacement on critical rotating machinery. It uses the M14 x 1.5 metric mounting thread, an 80 mm overall case length, and a 1.0 m integral cable.
A key feature of this configuration is the 11 connector and cable option, which specifies a miniature coaxial ClickLoc connector with connector protector and FluidLoc cable. This distinguishes the model from the more common 01 and 02 cable configurations and makes the exact part number especially important when replacing an existing probe.
The 3300 XL 11 mm system is designed for applications requiring a longer measurement range than the standard 8 mm system. Its nominal 3.94 V/mm (100 mV/mil) scale factor and approximately 4 mm (160 mil) linear range make it suitable for axial position, differential expansion, radial vibration, compressor rod position, tachometer, zero-speed, and Keyphasor applications.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-080-10-11-00 |
| 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 | 80 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc |
| Connector Protection | Connector protector |
| Cable Type | FluidLoc cable |
| Agency Approval | 00 – Not required |
| Measurement Principle | Non-contact eddy-current |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Nominal Linear Range | Approximately 4 mm (160 mils) |
| Frequency Response | 0 to 8 kHz, typical +0/-3 dB |
| Recommended Nominal Gap | Approximately 2.5 mm (100 mils) |
| Minimum Flat Target Diameter | 30.5 mm (1.2 in) |
| Recommended Minimum Shaft Diameter | 152 mm (6.0 in) |
| Typical Measurements | Radial vibration, radial position, axial position, Keyphasor |
| Probe Body | Stainless steel |
| Cable Armor | Stainless steel |
| Cable Jacket | FEP |
| Cable Configuration | FluidLoc |
| Approximate Probe Weight | Approximately 0.1 kg, configuration dependent |
| Typical Shipping Weight | Approximately 1–1.5 kg, packaging dependent |
Applications
Steam Turbine Monitoring
The 3300 XL 11 mm system is particularly valuable on steam turbines where additional measurement range is needed for axial thrust position and differential-expansion measurements.
Radial Shaft Vibration
The probe provides non-contact shaft-displacement measurement for radial vibration monitoring. It can be used on compatible fluid-film-bearing machinery and other critical rotating equipment.
Axial Position Measurement
The larger 11 mm sensing tip provides a longer linear range than the standard 8 mm system, making it suitable for applications involving axial shaft movement and thrust-position monitoring.
Differential Expansion
The system can be incorporated into turbine differential-expansion monitoring arrangements, providing displacement information associated with relative rotor and casing movement.
Reciprocating Compressor Monitoring
Compatible installations can use the 3300 XL 11 mm system for rod position and rod-drop measurements on reciprocating compressors.
Tachometer and Zero-Speed Measurement
The probe can be used in appropriate system configurations for tachometer and zero-speed measurements, providing rotational reference information to the monitoring system.
Keyphasor Applications
The 3300 XL 11 mm system can also provide phase-reference or Keyphasor signals, making the probe useful beyond conventional vibration measurement.
Demanding Cable Environments
The FluidLoc cable configuration provides an important advantage where cable protection against fluid ingress is part of the application requirement. This makes the 11 option worth considering for installations where standard cable construction may not be the preferred choice.
Advantages
Extended 11 mm Measurement Range
The 11 mm sensing platform offers a nominal 4 mm linear range, providing greater displacement measurement capability than the standard 3300 XL 8 mm system.
80 mm Case Configuration
The 80 mm case length gives the probe a clearly defined mechanical footprint. For replacement applications, matching this dimension can help preserve the existing mounting arrangement.
M14 x 1.5 Metric Mounting
The metric M14 x 1.5 thread provides a practical solution for compatible metric machinery installations and replacement projects.
FluidLoc Cable Protection
The 11 cable option is the defining feature of this part number. It combines the miniature coaxial ClickLoc connector and connector protector with FluidLoc cable, providing a specialized cable construction for demanding installation environments.
Connector Protector
The connector protector adds physical protection around the ClickLoc connection, which can be beneficial during installation and maintenance in machinery environments.
Compact 1 m Cable
A 1.0 m integral cable keeps the probe assembly compact where the Proximitor Sensor is located relatively close to the machine.
Armored Construction
The armored probe construction provides additional mechanical protection for cable routing in areas exposed to vibration and abrasion.
Flexible Machinery Monitoring
One transducer platform can support multiple measurement duties, including radial vibration, axial position, Keyphasor, tachometer, and zero-speed applications when the complete system is correctly configured.
Technical FAQs
1. What is the Bently Nevada 330704-000-080-10-11-00?
It is a 3300 XL 11 mm metric armored proximity probe with an M14 x 1.5 thread, 80 mm case length, 1 m integral cable, ClickLoc connector with protector, FluidLoc cable, and standard approval configuration.
2. Is this probe metric?
Yes. The 330704 model uses an M14 x 1.5 metric mounting thread and is the armored metric configuration of the 3300 XL 11 mm probe family.
3. What does the 080 option mean?
The 080 option specifies the 80 mm overall case length.
4. What does the 10 option specify?
The 10 option indicates a nominal 1.0 m (3.3 ft) integral cable.
5. What is special about the 11 option?
The 11 option specifies a miniature coaxial ClickLoc connector with connector protector and FluidLoc cable. This is the major configuration difference between this probe and standard-cable versions.
6. What does the final 00 indicate?
The final 00 specifies that no additional agency approval is required for the selected configuration.
7. What is the nominal linear range?
The 3300 XL 11 mm system provides approximately a 4 mm (160 mil) nominal linear range and a nominal 3.94 V/mm (100 mV/mil) scale factor.
8. What is the recommended probe gap?
A nominal reference gap of approximately 2.5 mm (100 mils) is used for the standard system specification. The final installed gap should be established according to the complete transducer-system requirements and target geometry.
9. Can the 11 cable configuration be replaced with a standard cable version?
It should not be assumed that the two configurations are interchangeable for every application. The FluidLoc cable is a deliberate configuration choice, so the replacement should match the original installation requirements and cable environment.
10. What should be checked before ordering this probe?
Confirm the 330704 model, M14 x 1.5 thread, 80 mm case length, 0 mm unthreaded length, 1 m cable, 11 connector/cable option, FluidLoc construction, connector protector, approval option, target geometry, probe gap, and compatible 3300 XL 11 mm Proximitor Sensor.
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