Product Overview
When vibration monitoring systems fail due to probe degradation, the Bently Nevada 330708-00-10-50-01-00 3300 XL 11 mm Proximity Probe provides a robust solution. Designed for harsh industrial environments, this probe offers precise measurements with a tip material of Polyphenylene sulfide (PPS) and a case of AISI 304 stainless steel. The 5.0 meter (16.4 feet) total length with 75 Ω triaxial, fluoroethylene propylene (FEP) insulated probe cable ensures reliable signal transmission.
Part of the 3300 XL series, the Bently Nevada 330708-00-10-50-01-00 is engineered for continuous shaft vibration and position monitoring in critical rotating machinery. Its 5/8-18 UNF thread and miniature coaxial ClickLoc connector simplify installation. This probe is made in the USA and operates across a wide temperature range from -52°C to +177°C.
Technical Specifications
| Parameter |
Value |
| Total Probe Length |
5.0 meters (16.4 feet) |
| Probe DC Resistance (RPROBE) |
7.2 ± 0.8 ohms |
| Operating and Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Probe Case Thread |
5/8-18 UNF |
| Maximum Thread Engagement Length |
0.938 inches |
| Recommended Probe Case Torque |
15.2 N·m (133 in·lb) |
| Maximum Probe Case Torque |
45.2 N·m (400 in·lb) |
| Connector Type |
Miniature coaxial ClickLoc with connector protector |
| Cable Specification |
75 Ω triaxial, FEP insulated |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel |
| Minimum Bend Radius |
25.4 mm (1.0 in) |
| Shipping Weight |
0.17 kg |
Industry Applications
The Bently Nevada 330708-00-10-50-01-00 3300 XL 11 mm Proximity Probe is ideal for monitoring shaft vibration and axial position in turbines, compressors, pumps, and electric motors. Its high-temperature tolerance and robust stainless steel case make it suitable for steam turbines and gas compressors where reliability is critical. In paper mills or petrochemical plants, this probe withstands aggressive environments while delivering accurate displacement measurements for machinery protection systems.
Because the probe seals differential pressure between tip and case (via Viton O-ring), it can be used in applications where internal pressure varies. However, note that exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal. Always verify operating conditions against the specified temperature range.
Installation and Setup Guidance
Proper installation ensures long-term accuracy. Use the recommended probe case torque of 15.2 N·m (133 in·lb) — exceeding the maximum of 45.2 N·m (400 in·lb) can damage the thread or seal. The 5/8-18 UNF thread allows engagement up to 0.938 inches; verify thread depth in your mounting bracket to avoid bottoming out. For the miniature coaxial ClickLoc connector, use finger-tight torque (maximum 0.565 N·m or 5 in·lb) to avoid damaging the connector protector.
Maintain a minimum bend radius of 25.4 mm (1.0 inch) for the probe cable, whether armored or not. Do not pull or twist the cable during routing. The 75 Ω triaxial cable requires proper grounding to prevent noise interference. If the probe will be exposed to pressures above ambient, contact the custom design department for pressure seal testing — standard probes are not tested before shipment.
Troubleshooting and Common Issues
One common failure mode for proximity probes is cable damage at the connector or bend points. The Bently Nevada 330708-00-10-50-01-00 uses a robust FEP insulation and connector protector to mitigate this. If you observe signal drift or loss, first check the connector torque — overtightening can crack the coaxial core. Also verify that the probe tip is not contaminated; PPS material resists many chemicals but should be cleaned with approved solvents.
Another issue is pressure seal failure under extreme cold. As noted, avoid temperatures below -34°C (-30°F) during operation or storage. For high-temperature applications up to +177°C, the cable insulation remains stable. If the measured resistance from center conductor to outer conductor deviates beyond 7.2 ± 0.8 ohms, the probe may have internal damage and should be replaced.
Buying Guide and Selection Advice
Before purchasing the Bently Nevada 330708-00-10-50-01-00, confirm your mounting thread (5/8-18 UNF) and required probe length. The 5-meter cable is ideal for most turbine installations, but alternative lengths (1 or 9 meters) are available in this series. Ensure your monitoring system accepts 75 Ω triaxial input. For custom pressure testing or special armor, contact your supplier. UBEST Automation (available at ubest101.myshopify.com) offers genuine Bently Nevada parts with prompt shipping. Verify that the connector type matches your extension cable (miniature coaxial ClickLoc).