Product Introduction
The Bently Nevada 330708-00-20-50-02-00 3300 XL 11 mm Proximity Probes are engineered for precise vibration measurement in rotating machinery. Proximity probes face challenges like temperature extremes and pressure seal degradation. This model addresses these with a robust design featuring a polyphenylene sulfide (PPS) probe tip and a Viton O-ring pressure seal. The 330708-00-20-50-02-00 provides consistent performance in harsh industrial environments.
Technical Specifications
Below are the key specifications for the Bently Nevada 330708-00-20-50-02-00 probe. All values are from the manufacturer’s data.
| Parameter |
Value |
| Probe dc Resistance (5.0 m length) |
7.2 ± 0.8 ohms |
| Probe Case Thread |
5/8-18 UNF |
| Maximum Thread Engagement |
0.938 in (23.8 mm) |
| Probe Case Torque (Maximum) |
45.2 N·m (400 in·lb) |
| Probe Case Torque (Recommended) |
15.2 N·m (133 in·lb) |
| Operating/Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel |
| Cable Type |
75 Ω triaxial, FEP insulated |
| Total Length Option |
5.0 meters (16.4 feet) |
| Connector Type |
Miniature coaxial ClickLoc, FluidLoc cable |
| Shipping Weight |
0.17 kg |
Installation & Setup Guidance
Proper installation of the Bently Nevada 330708-00-20-50-02-00 probe ensures reliable operation. Use the recommended torque of 15.2 N·m (133 in·lb) for the probe case. Avoid exceeding 45.2 N·m maximum torque to prevent damage. Ensure thread engagement does not exceed 0.938 inches (23.8 mm) for 5/8-18 UNF threads. The connector-to-connector torque should be finger tight, with a maximum of 0.565 N·m (5 in·lb). The minimum bend radius of the cable is 25.4 mm (1.0 inch).
Maintenance & Reliability
Regular inspection of the 330708-00-20-50-02-00 probe focuses on the pressure seal integrity. Exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the Viton O-ring seal. Keep the cable free from sharp bends and chemical exposure. The FEP insulation provides good chemical resistance, but periodic visual checks are recommended. The probe is designed for long service life in continuous monitoring applications, reducing overall maintenance costs.
Troubleshooting & Common Issues
Common issues with proximity probes include signal drift or loss. For the Bently Nevada 330708-00-20-50-02-00, measure the probe dc resistance between center and outer conductors. It should be 7.2 ± 0.8 ohms for a 5.0 meter probe. Abnormal readings indicate cable damage or connector issues. Ensure the probe tip is clean and free from metallic debris. If the pressure seal fails, condensation may enter the probe, causing erratic readings. Replace the probe if seal integrity is compromised. For application-specific support, consult the factory custom design department.