The Bently Nevada 330706-05-046-10-02-00 3300 XL 11 mm Reverse Mount Probe is a precision eddy-current proximity probe designed for high-reliability vibration and shaft position measurements in demanding industrial environments. Part of the renowned 3300 XL series, it uses advanced reverse-mount construction that allows installation from inside the machine case, simplifying maintenance while maintaining measurement accuracy. The probe delivers precise gap control and exceptional signal stability, even in the presence of oil films, temperature changes, or electromagnetic interference. Its rugged build and consistent performance make it an ideal solution for critical rotating equipment monitoring in power generation, petrochemical, and heavy-industry applications.

Technical Specifications

Applications

The 330706-05-046-10-02-00 probe is widely used for precision machinery monitoring where reverse installation is required:

• Steam and Gas Turbines – Accurate shaft vibration and thrust position measurement for high-speed rotating equipment.

• Compressors and Pumps – Continuous monitoring of bearing vibration to prevent unplanned shutdowns.

• Generators and Motors – Detects imbalance or misalignment to protect critical power infrastructure.

• Industrial Fans and Gearboxes – Ensures stable operation under harsh mechanical stress and thermal variation.

• Petrochemical Processing Equipment – Reliable performance in corrosive and high-temperature environments.

Advantages

• Reverse-Mount Design

  Enables installation from inside the machine case, reducing external hardware requirements and simplifying service access.

• Superior Signal Stability

  Maintains accurate vibration and position data even in the presence of high temperatures, oil contamination, or electromagnetic interference.

• Wide Temperature Capability

  Operates reliably from –35 °C to +177 °C, suitable for extreme industrial conditions.

• High Reliability and Long Service Life

  Built from corrosion-resistant stainless steel with robust insulation, ensuring long-term durability in demanding applications.

• Seamless Compatibility

  Fully compatible with 3300 XL Proximitor drivers and standard extension cables, simplifying system integration.

FAQ

1. What is the operating principle of the 3300 XL 11 mm Reverse Mount Probe?

   It uses an eddy-current sensing method, generating a magnetic field to measure the distance to a conductive shaft surface, providing precise vibration and position data.

2. What is the recommended gap voltage for optimal operation?

   The typical gap voltage is set around –8 V DC at the target distance, ensuring linear output across the measurement range.

3. How does the reverse-mount design improve installation?

   It allows the probe to be inserted from inside the machine case, reducing the need for external brackets and simplifying alignment.

4. Which Proximitor driver models are compatible?

   The probe is designed to operate with Bently Nevada 3300 XL Proximitor drivers for accurate signal conditioning.

5. Can this probe handle high vibration environments?

   Yes, it withstands vibration levels up to 100 g peak in the 10–2000 Hz range without loss of accuracy.

6. What is the maximum cable length supported?

   The probe supports standard system lengths when used with approved Bently Nevada extension cables and Proximitor drivers, maintaining calibration accuracy.

7. Is the probe immune to oil contamination on the target surface?

   Yes, the eddy-current technology maintains accuracy even when an oil film is present between the probe and the shaft.

8. What is the frequency response of the system?

   The probe provides a DC to 10 kHz frequency response, suitable for high-speed machinery vibration analysis.

9. Does the probe require special shielding for EMI protection?

   No special shielding is required beyond standard installation practices; the probe is designed with integrated EMI protection.

10. How is calibration maintained over time?

    Calibration remains stable if the probe, cable, and driver are kept as a matched set, ensuring long-term measurement accuracy without frequent recalibration.