330171-01-10-10-02-00 Bently Nevada 5mm Probe 1/4-28 UNF

Problem: Unreliable Shaft Vibration Data in Harsh Environments

Industrial machinery often operates under extreme conditions that degrade standard proximity probes. The Bently Nevada 330171-01-10-10-02-00 addresses this by delivering engineering-grade precision in a robust 5mm probe design. As part of the 3300 series, it provides exact measurement of shaft displacement and vibration, ensuring early fault detection.

Solution: 330171-01-10-10-02-00 Technical Specifications

This probe features a polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case for chemical and mechanical resilience. The 1/4-28 UNF thread ensures secure mounting, while the miniature coaxial ClickLoc connector simplifies installation. With a total length of 1.0 metre and a weight of 0.323 kg, it balances reach and stability.

• Input Voltage: -17.5 Vdc to -26 Vdc at 12 mA maximum
• Output Resistance: 50 Ω
• Probe DC Resistance: 7.59 ± 0.50 Ω
• Probe Tip Material: Polyphenylene sulfide (PPS)
• Probe Case Material: AISI 304 stainless steel
• Connector: Miniature coaxial ClickLoc, standard cable
• Total Length: 1.0 metre (3.3 feet)
• Weight: 0.323 kg

Problem: Integration with Existing Monitoring Systems

Compatibility issues can delay deployment. The 330171-01-10-10-02-00 integrates seamlessly with Bently Nevada 3300 series monitors and proximitor sensors. Its -24 Vdc power requirement aligns with standard industrial supplies, and the 50 Ω output resistance matches typical data acquisition inputs.

Solution: Applications and Use Cases

This probe excels in steam turbines, compressors, and pumps where precise radial vibration monitoring is critical. For instance, in a power plant turbine, it detects unbalance or misalignment early, preventing costly downtime. The 1/4-28 thread allows direct mounting into bearing housings, while the PPS tip withstands high temperatures up to +177°C.

Problem: Installation and Maintenance Challenges

Improper installation can skew measurements. Use a #3 or larger tap drill for the 1/4-28 hole, and ensure thread engagement does not exceed 0.375 in. Recommended probe case torque is 5.1 N·m (45 in·lb), with a maximum of 7.3 N·m (65 in·lb). Maintain a minimum cable bend radius of 25.4 mm to avoid damage.

Solution: Reliability and Environmental Considerations

The probe operates from -35°C to +177°C, but exposure below -34°C may cause premature seal failure. Regular inspection of the connector and cable is advised. For 60 Hz magnetic fields, the probe's output remains stable, ensuring accurate data in electrically noisy environments.