Introduction
The Bently Nevada 330704-000-100-10-01-RU is a metric 3300 XL 11 mm Proximity Probe designed for accurate, non-contact measurement of shaft vibration and displacement in demanding rotating-machinery applications.
This probe combines an M14 x 1.5 metric mounting thread, armored construction, 100 mm overall case length, 1.0 m integral cable, and a miniature coaxial ClickLoc connector with connector protector and standard cable. The extended 100 mm case configuration makes this model particularly useful where the existing machinery installation requires a longer probe body.
The 3300 XL 11 mm platform provides a nominal 4 mm (160 mil) linear measurement range with a nominal scale factor of 3.94 V/mm (100 mV/mil). This makes the system suitable for applications where reliable shaft-position or vibration information is essential, including turbines, compressors, generators, motors, and other high-value rotating assets.
The RU suffix identifies the specified approval/configuration variant associated with this part number. For replacement work, the complete ordering code should be matched carefully rather than selecting a probe based only on its 11 mm sensing diameter.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 330704-000-100-10-01-RU |
| 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 | 100 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Connector | Miniature coaxial ClickLoc |
| Connector Protector | Included |
| Cable Type | Standard cable |
| 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) |
| Typical Measurements | Radial vibration, radial position, axial position, Keyphasor |
| Probe Body | Stainless steel |
| Cable Armor | Stainless steel |
| Cable Jacket | FEP |
| Approximate Probe Assembly Weight | Approximately 0.1 kg |
| Typical Shipping Weight | Approximately 1–1.5 kg, packaging dependent |
| Approval / Configuration Suffix | RU |
Applications
Steam Turbine Monitoring
The 3300 XL 11 mm system is well suited to steam-turbine monitoring where accurate displacement information is required. It can support compatible axial-position and differential-expansion measurement arrangements.
Shaft Vibration Monitoring
The probe provides non-contact measurement of shaft movement, making it suitable for radial vibration monitoring on critical rotating machinery.
Axial Position Measurement
The 11 mm sensing system provides a nominal 4 mm linear range, making it useful for applications where axial shaft movement needs to be monitored continuously and reliably.
Differential Expansion
Compatible turbine installations can use the 3300 XL 11 mm system for differential-expansion measurement, helping operators observe relative rotor and casing movement.
Compressor Monitoring
The probe can be incorporated into suitable compressor monitoring systems for shaft displacement and other machinery-condition measurements.
Generator and Motor Applications
Large motors and generators can benefit from non-contact proximity measurement for monitoring shaft behavior, vibration, and displacement.
Keyphasor and Tachometer Functions
In a correctly configured transducer system, the probe can provide phase-reference and rotational-speed information for Keyphasor and tachometer applications.
Existing Long-Body Probe Installations
The 100 mm case length is a major advantage when replacing an existing probe with a specific mechanical mounting depth. It allows maintenance teams to preserve an established installation without automatically changing the mounting arrangement.
Advantages
Extended 100 mm Case Configuration
The 100 mm overall case length gives this probe a distinctive mechanical configuration within the 330704 family. It is an excellent choice when an existing installation specifically requires this probe length.
Metric M14 x 1.5 Mounting
The M14 x 1.5 thread provides a practical metric mounting solution for compatible industrial machinery.
11 mm Sensing Tip
The 11 mm sensing platform provides a nominal 4 mm linear range, offering additional measurement capability compared with standard 8 mm proximity systems.
Armored Construction
The armored design provides additional mechanical protection around the cable assembly, making the probe well suited to industrial environments where vibration, abrasion, and difficult routing conditions are present.
Protected ClickLoc Connector
The 01 configuration includes a connector protector, helping protect the miniature coaxial connection during installation, maintenance, and normal machinery operation.
Compact 1 m Cable
The 1.0 m integral cable is well suited to installations where the Proximitor Sensor can be positioned relatively close to the probe. It avoids unnecessary excess cable and helps maintain a clean installation.
Proven Eddy-Current Technology
Non-contact eddy-current sensing allows shaft movement to be measured without physical contact between the probe and target. This supports continuous monitoring without introducing mechanical probe wear.
Versatile Monitoring Platform
The 3300 XL 11 mm system can be used for multiple measurement duties, including radial vibration, radial position, axial position, Keyphasor, tachometer, and zero-speed measurements when the complete transducer configuration is appropriate.
Replacement-Friendly Configuration
Because the complete ordering code defines the probe's mechanical and electrical configuration, the 330704-000-100-10-01-RU provides a precise reference for maintenance and replacement purchasing.
Technical FAQs
1. What is the Bently Nevada 330704-000-100-10-01-RU?
It is a 3300 XL 11 mm metric armored proximity probe with an M14 x 1.5 mounting thread, 100 mm case length, 1 m integral cable, ClickLoc connector with protector, standard cable, and RU configuration.
2. Is this a metric proximity probe?
Yes. The 330704 model uses an M14 x 1.5 metric mounting thread.
3. What does the 100 option specify?
The 100 option identifies the 100 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 does the 01 connector option mean?
The 01 configuration uses a miniature coaxial ClickLoc connector with connector protector and standard cable.
6. What does the RU suffix mean?
The RU suffix identifies the particular approval or regional configuration associated with this part number. Because the standard 3300 XL ordering tables use defined agency-approval codes, the RU designation should be retained exactly when replacing an existing RU-configured probe.
7. What is the nominal measurement range?
The 3300 XL 11 mm system has a nominal 4 mm (160 mil) linear range and a nominal scale factor of 3.94 V/mm (100 mV/mil).
8. What is the typical probe gap?
The nominal reference gap is approximately 2.5 mm (100 mils). The actual installed gap should be established according to the complete transducer system, target material, shaft geometry, and machinery requirements.
9. Can this 100 mm probe replace a shorter 330704 probe?
Not automatically. Even though the probe family and thread may be the same, the case length directly affects the mechanical installation. The 100 mm configuration should be selected when the existing mounting arrangement is designed for that dimension.
10. What should be checked before ordering?
Confirm the 330704 model, M14 x 1.5 thread, 0 mm unthreaded length, 100 mm case length, 1 m cable, 01 connector configuration, armored construction, RU variant, target geometry, probe gap, and compatible 3300 XL 11 mm Proximitor Sensor.
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