The Bently Nevada 330708-00-24-10-01-CN 3300 XL 11 mm Proximity Probe is a high-precision eddy-current sensor designed to deliver continuous, accurate vibration and shaft position measurements for critical rotating equipment. As part of the proven 3300 XL series, this probe provides exceptional stability in demanding industrial environments where heat, oil film, and electromagnetic noise can compromise measurement quality. The “CN” suffix designates a variant manufactured and certified for specific regional standards, while retaining full compatibility with the global 3300 XL platform. Its 11 mm sensing tip offers an extended linear range, making it ideal for large-shaft applications across power generation, petrochemical, and heavy-process industries.

Product Specifications

Applications

The 330708-00-24-10-01-CN probe supports continuous monitoring and protection of essential rotating machinery:

• Steam and Gas Turbines – Provides accurate shaft vibration and thrust measurements to prevent catastrophic failures.

• Compressors and Pumps – Detects bearing wear and rotor instability for early fault detection.

• Generators and Motors – Monitors shaft alignment and dynamic balance to improve operational reliability.

• Industrial Fans and Gearboxes – Maintains stable performance under mechanical and thermal stress.

• Petrochemical and Refinery Equipment – Withstands corrosive environments while maintaining measurement precision.

Advantages

• High Measurement Accuracy

  Maintains precise displacement and vibration readings over a wide linear range, ensuring dependable condition monitoring.

• Robust Environmental Resistance

  Performs reliably in high temperature, high humidity, and oil-contaminated conditions typical of industrial plants.

• Excellent EMI/RFI Immunity

  Built-in shielding provides stable operation even in electrically noisy environments.

• Seamless System Compatibility

  Fully compatible with Bently Nevada 3300 XL Proximitor drivers and standard extension cables for simplified integration.

• Long-Term Durability

  Stainless steel housing and a rugged polymer sensing tip ensure a long service life with minimal maintenance.

FAQ

1. How does the 3300 XL 11 mm Proximity Probe sense shaft movement?

   It operates on the eddy-current principle, producing a magnetic field and detecting changes in impedance as the shaft moves, converting these variations into a proportional electrical signal.

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

   A typical operating gap voltage of around –8 V DC ensures linear output and accurate displacement measurement.

3. Which Proximitor drivers are compatible with this probe?

   It is fully compatible with Bently Nevada 3300 XL Proximitor drivers, ensuring accurate signal conditioning and calibration.

4. What vibration levels can the probe withstand?

   The probe endures vibration up to 100 g peak within the 10–2000 Hz range without affecting measurement accuracy.

5. Is the measurement affected by an oil film on the shaft?

   No, the eddy-current technology maintains accuracy even when a thin oil film is present between the probe and target surface.

6. What is the frequency response of the probe-driver system?

   The system provides a flat frequency response from DC to 10 kHz, suitable for monitoring high-speed rotating equipment.

7. Does the probe require extra shielding for electromagnetic interference?

   No additional shielding is necessary; the probe’s design includes integrated EMI/RFI protection for stable operation.

8. How is calibration maintained over time?

   Calibration remains stable as long as the probe, extension cable, and Proximitor driver remain a matched set and are installed per Bently Nevada guidelines.

9. Can the probe measure both radial and axial displacement?

   Yes, it is suitable for both radial shaft vibration monitoring and axial (thrust) position measurement when installed correctly.

10. What insulation resistance is required for reliable performance?

    The probe maintains insulation resistance greater than 100 MΩ at 500 V DC, ensuring dependable electrical isolation.