Product Overview
The Bently Nevada 330708-00-10-90-02-05 3300 XL 11 mm Proximity Probe is engineered for precise displacement and vibration measurement in rotating machinery. This probe features a polyphenylene sulfide (PPS) tip and an AISI 304 stainless steel case, ensuring durability in harsh industrial environments. With a total length of 9.0 meters and a 5/8-18 UNF thread, the 330708-00-10-90-02-05 offers reliable performance in steam turbines, compressors, and pumps.
Common failure modes in proximity probes include cable fatigue, temperature stress, and thread damage. The 330708-00-10-90-02-05 addresses these with a 75 Ω triaxial FEP-insulated cable rated for -51°C to +177°C, a robust Viton O-ring seal for differential pressure, and a recommended case torque of 15.2 N·m to prevent overtightening. This design minimizes downtime and extends service life.
Installation & Setup Guidance
Proper installation of the Bently Nevada 330708-00-10-90-02-05 3300 XL Probe ensures accurate readings. The 5/8-18 UNF probe case thread allows a maximum engagement of 0.938 inches. Use the recommended torque of 15.2 N·m (133 in·lb) and never exceed 45.2 N·m (400 in·lb) to avoid thread damage. The miniature coaxial ClickLoc connector (option 02) requires only finger-tight installation; maximum torque is 0.565 N·m (5 in·lb). Ensure the cable minimum bend radius is 25.4 mm (1.0 in) to prevent signal degradation.
For pressure-sensitive applications, note that the probe seal is designed for differential pressure but is not pressure tested prior to shipment. Contact our custom design department if verification is needed.
Maintenance & Reliability
The 330708-00-10-90-02-05 proximity probe operates reliably across -51°C to +177°C. However, exposing the probe to temperatures below -34°C (30°F) may accelerate pressure seal failure. Regular inspection of the cable and connector is recommended, especially in high-vibration environments. The probe dc resistance from center conductor to outer conductor measures 8.5 ± 1.1 ohms at 9.0 m length; any significant deviation indicates potential cable damage. Store the probe in a clean, dry environment when not in use.
Selection Guide & Purchasing Advice
When selecting the Bently Nevada 330708-00-10-90-02-05, verify the required total probe length (1, 5, or 9 meters) and connector type. This variant includes option 00 for unthreaded length, 10 for overall case length, 90 for 9 meters, 02 for ClickLoc connector, and 05 for multiple agency approvals. For cross-validation, confirm the probe tip material (PPS) and case material (304 SST). UBEST Automation stocks genuine Bently Nevada parts; contact us at ubest101 for assistance with your specific application.
Troubleshooting Common Issues
If the probe output is erratic, first check the cable for kinks or sharp bends exceeding the 25.4 mm minimum radius. Verify the connector torque is correct (finger-tight). For temperature-related drift, ensure ambient conditions remain within -51°C to +177°C. If the probe tip is contaminated, clean with a soft cloth; avoid abrasive materials. Persistent problems may indicate thread damage; inspect the case thread for galling. The 330708-00-10-90-02-05 is designed for reliable operation when these precautions are followed.