The Bently Nevada 330703-000-040-90-01-00 3300 XL 11 mm Proximity Probe is a high-precision, non-contact displacement sensor designed for critical rotating machinery. Built for continuous monitoring of shaft vibration and rotor position, it plays an essential role in predictive maintenance and machinery protection systems. Part of the renowned 3300 XL series, the probe offers exceptional accuracy, long-term stability, and rugged construction for dependable operation in demanding industrial environments such as power generation, petrochemical facilities, and heavy manufacturing plants. Its stainless-steel housing and ceramic sensing tip provide superior resistance to corrosion, wear, and electrical interference.

Product Specifications

Applications

• Turbomachinery Protection – Continuous monitoring of turbines and compressors to prevent catastrophic failures.

• Generator and Motor Monitoring – Detects rotor imbalance and shaft displacement for improved reliability.

• Petrochemical Operations – Ideal for pumps, fans, and high-speed rotating equipment in refineries and chemical plants.

• Power Generation – Integrates with plant-wide systems to support predictive maintenance strategies.

• Industrial Machinery – Ensures accurate vibration analysis in critical manufacturing equipment.

• Retrofit and Upgrade Projects – Standard 11 mm design allows easy replacement of existing proximity probes.

Advantages

• High Precision – Maintains ±1 % linearity for consistent displacement measurements.

• Robust Construction – Stainless-steel housing and ceramic tip resist corrosion and abrasive conditions.

• Extended Cable Reach – 9 m total length simplifies installation on large or complex machinery.

• Reliable EMI Shielding – Advanced internal shielding ensures clean signals in electrically noisy environments.

• Seamless Integration – Fully compatible with 3300 XL Proximitor sensors and associated monitoring hardware.

• Predictive Maintenance Support – Enables early detection of misalignment, bearing wear, and rotor imbalance to reduce downtime.

Frequently Asked Questions (FAQ)

1. What sensing principle does this probe use?

   It operates on eddy-current technology, generating a voltage proportional to the gap between the probe and the shaft surface.

2. Is it compatible with all 3300 XL Proximitor sensors?

   Yes, it is designed for direct connection to any 3300 XL Proximitor within specified calibration limits.

3. What is the typical output sensitivity?

   Approximately 5 mV/µm of shaft movement.

4. Can it handle high vibration levels found in turbines?

   Yes, it is rated for up to 20 g in the 10–2000 Hz frequency range.

5. Does the probe require field calibration?

   Factory calibration ensures accuracy; only routine system verification is recommended.

6. How does it maintain signal integrity in electrically noisy areas?

   Multi-layer shielding and high-quality cable construction minimize electromagnetic interference.

7. Can this probe measure both radial and axial displacement?

   Primarily intended for radial measurements, but axial monitoring is possible when properly mounted.

8. What environmental protections are built into the design?

   Stainless-steel housing and a ceramic tip provide corrosion and abrasion resistance in harsh conditions.

9. Is it suitable for continuous online monitoring systems?

   Yes, it is engineered for permanent installation and 24/7 data acquisition.

10. What is the recommended operating temperature range?

    The probe performs reliably from –40 °C to +120 °C.