Introduction
The Bently Nevada 330704-000-050-90-02-CN is a 3300 XL 11 mm proximity probe engineered for non-contact measurement of shaft vibration and displacement in demanding rotating-equipment environments. This configuration features an M14 x 1.5 metric thread, armored construction, 50 mm overall case length, 9.0 m integral cable, and a miniature coaxial ClickLoc connector with standard cable.
The 3300 XL 11 mm platform is designed for applications where a larger sensing range is desirable. With a nominal 4 mm (160 mil) linear range and a nominal scale factor of 3.94 V/mm (100 mV/mil), it provides a practical solution for machinery applications involving shaft position, radial vibration, axial movement, and other displacement measurements.
This particular version also carries the CN country-specific approval option, which makes the exact configuration relevant when equipment approval requirements form part of the installation specification. The combination of a long 9 m cable and armored probe construction is especially useful for large machinery where the sensing point is physically separated from the associated Proximitor Sensor.
For replacement projects, the full part number should be matched rather than selecting a probe only by its 11 mm designation. Thread size, case length, cable length, connector type, armor, and approval configuration all influence installation compatibility.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-050-90-02-CN |
| Product Family | 3300 XL |
| Product Type | 11 mm Proximity Probe |
| Probe Model | 330704 |
| Probe Tip Size | 11 mm |
| Mounting Thread | M14 x 1.5 |
| Construction | Armored |
| Unthreaded Length | 0 mm |
| Overall Case Length | 50 mm |
| Integral Cable Length | 9.0 m (29.5 ft) |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | Standard cable |
| Approval Configuration | CN – Country-Specific Approvals |
| Measurement Principle | Non-contact eddy-current sensing |
| Nominal Scale Factor | 3.94 V/mm (100 mV/mil) |
| Nominal Linear Range | 4 mm (160 mils) |
| 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 |
| Operating / Storage Temperature | Approximately -51°C to +177°C |
| Typical Measurement Functions | Radial vibration, radial position, axial position, Keyphasor |
| Shipping Weight | Approximately 2 kg |
Applications
Steam Turbine Monitoring
The 3300 XL 11 mm system is well suited to turbine applications requiring reliable shaft displacement information. It can support axial position, thrust position, and differential-expansion measurements when the probe is installed with the appropriate target geometry.
Radial Shaft Vibration
The probe provides non-contact displacement measurement that can be used to monitor radial shaft vibration on compatible rotating machinery. This is particularly valuable for high-value assets where early identification of abnormal rotor movement can support maintenance planning.
Compressor Applications
The 11 mm system can be applied to compressor monitoring duties, including compatible rod-position and rod-drop measurements on reciprocating compressors.
Axial Position Measurement
The larger 11 mm sensing configuration offers additional linear measurement range, making it a useful choice for axial shaft-position applications where the measurement requirements exceed the practical range of smaller proximity probe systems.
Keyphasor and Speed Monitoring
When integrated into a properly configured 3300 XL transducer system, the probe can provide a phase reference for rotational machinery and support tachometer or zero-speed measurement functions.
Large Industrial Machinery
The 9 m integral cable is particularly beneficial in large installations such as turbine-generator trains, compressors, and other critical machinery where the probe and Proximitor Sensor cannot be installed close together.
Machinery Protection Systems
The probe forms part of a complete proximity transducer system and can supply displacement information to compatible signal-conditioning and machinery-monitoring equipment. Proper system matching allows the measured signal to support alarm, diagnostic, and protective functions.
Advantages
Extended 11 mm Sensing Capability
The 11 mm platform provides a nominal 4 mm linear measurement range, giving engineers more measurement headroom for applications involving larger shaft displacement or axial movement.
Long-Distance Installation Flexibility
A 9 m integral cable allows the sensing point to be positioned well away from the Proximitor Sensor. This is a valuable feature for large machinery layouts where conventional short-cable configurations may not provide sufficient installation reach.
Armored Cable Construction
The stainless-steel armored design provides additional protection for the probe cable against abrasion, vibration, and demanding routing conditions. This can be particularly advantageous around large rotating machines where cable exposure is unavoidable.
Metric M14 x 1.5 Thread
The M14 x 1.5 mounting thread provides a practical solution for metric machinery installations. It also makes the model a straightforward replacement candidate when the existing equipment already uses a 330704 probe.
Secure ClickLoc Connection
The miniature coaxial ClickLoc connector is designed for a secure connection in machinery environments where continuous vibration can challenge conventional cable connections.
Country-Specific Approval Option
The CN suffix identifies the country-specific approval configuration. This makes the exact part number important for projects where regulatory approvals are specified as part of the equipment procurement package.
Proven 3300 XL System Architecture
The probe is designed to work as part of the 3300 XL 11 mm Proximity Transducer System. Using the correctly matched probe, extension cable, and Proximitor Sensor helps maintain the expected electrical characteristics and measurement performance.
Practical Replacement Value
For maintenance departments, the combination of M14 x 1.5 mounting, 50 mm case length, 9 m cable, armored construction, ClickLoc connection, and CN approval configuration provides a clearly defined replacement specification rather than a generic proximity-sensor solution.
Technical FAQs
1. What is the Bently Nevada 330704-000-050-90-02-CN?
It is a Bently Nevada 3300 XL 11 mm proximity probe with an M14 x 1.5 metric thread, armored construction, 50 mm case length, 9 m integral cable, miniature coaxial ClickLoc connector, and CN country-specific approval configuration.
2. What does the 330704 model indicate?
The 330704 model identifies the 3300 XL 11 mm probe with an M14 x 1.5 metric thread and armored construction.
3. What does the 050 option specify?
The 050 configuration specifies a 50 mm overall case length.
4. What does the 90 option mean?
The 90 configuration indicates a nominal 9.0 m (29.5 ft) total integral cable length.
5. What connector does the 02 option use?
The 02 option specifies a miniature coaxial ClickLoc connector with standard cable.
6. What does the CN suffix represent?
The CN suffix identifies a country-specific approval configuration. The exact approvals applicable to a particular installation should be verified against the project's certification and regulatory requirements.
7. What is the nominal measurement 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 for the 3300 XL 11 mm system is approximately 2.5 mm (100 mils). Final installation should account for the complete transducer-system requirements, target material, shaft geometry, and machinery design.
9. Can the probe be used with a 3300 XL 8 mm Proximitor Sensor?
The 330704 11 mm probe is intended for the corresponding 3300 XL 11 mm transducer system. It should not be treated as a direct substitute for an 8 mm system without verifying complete system compatibility.
10. What should be checked before purchasing this probe as a replacement?
Confirm the 330704 model, M14 x 1.5 thread, 50 mm case length, 9 m cable, ClickLoc connector, armored construction, CN approval option, target geometry, probe gap, and compatible 3300 XL 11 mm Proximitor Sensor. Matching the probe diameter alone is not enough to guarantee a correct replacement.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
