Bently Nevada 330101-32-70-10-12-05 3300 XL 8 mm Probe

Product Overview

The Bently Nevada 330101-32-70-10-12-05 is a 3300 XL 8 mm probe with a 3/8-24 UNF thread, without armor. It is engineered for eddy current displacement measurement, providing a linear range of 2 mm (80 mils) starting at approximately 0.25 mm (10 mils) from the target. This probe incorporates patented TipLoc molding for a robust bond between tip and body, and CableLoc technology delivering 330 N (75 lbf) pull strength to secure the cable and tip. The optional FluidLoc cable prevents oil leakage through the cable interior.

Technical Specifications Breakdown

Key parameters for the 330101-32-70-10-12-05 are listed below for quick reference:

Industry Applications

Turbine and Compressor Protection

In steam turbines and centrifugal compressors, shaft vibration must be monitored continuously. The 330101-32-70-10-12-05 provides a stable -9 Vdc recommended gap setting for radial vibration, ensuring early detection of imbalance or misalignment. Its FluidLoc cable option is particularly valuable in oil-lubricated environments, preventing leaks that could contaminate the machine.

Pump and Motor Monitoring

For large pumps and motors, the probe's 2 mm linear range covers typical vibration amplitudes. The stainless steel case (AISI 303 or 304) resists corrosion in harsh process areas. The TipLoc molding reduces the risk of tip detachment, a common failure mode in high-vibration applications.

Geared Systems and Fans

Geared drives and cooling fans often operate in confined spaces. The 3/8-24 UNF thread and compact 8 mm diameter allow easy installation in tight locations. The probe's pull strength of 330 N ensures the cable remains secure even under constant flexing.

Installation & Setup Guidance

Proper installation is critical for accurate readings. First, verify that the mounting hole is tapped to 3/8-24 UNF and that thread engagement does not exceed 0.563 in. For forward-mounted probes, apply a maximum torque of 33.9 N•m (300 in•lbf) to the case; the recommended torque is 11.2 N•m (100 in•lbf). For the first three threads, use a maximum of 22.6 N•m (200 in•lbf) and a recommended 7.5 N•m (66 in•lbf).

When setting the gap, aim for approximately -9 Vdc, which corresponds to about 1.27 mm (50 mils) from the target. Use a 3-conductor shielded triad cable for field wiring, with conductor sizes from 0.2 to 1.5 mm² (16 to 24 AWG). The maximum field wiring length between the Proximitor Sensor and the monitor is 305 meters (1,000 feet).

Maintenance & Reliability

Inspect the probe and cable periodically for signs of wear, especially at the connector and tip. The probe's relative humidity tolerance is : less than a 3% change in Average Scale Factor when tested at 93% humidity for up to 56 days per IEC 68-2-3. However, avoid exposing the probe to temperatures below -34°C (-30°F), as this may cause premature failure of the pressure seal. The probe tip material is polyphenylene sulfide (PPS), which offers good chemical resistance.

The Challenge of Reliable Vibration Monitoring

Industrial rotating machinery demands precise, uninterrupted vibration measurement to prevent catastrophic failure. Standard probes often suffer from cable pull-out, fluid ingress, or signal drift, leading to costly downtime.

Compatibility & Integration

This probe is designed for use with Bently Nevada 3300 XL Proximitor Sensors and compatible monitoring systems. The miniature coaxial ClickLoc connector ensures a secure, quick connection. The FluidLoc cable option is specifically engineered to prevent oil wicking, making it suitable for machines with oil lubrication systems. The probe is approved under CSA, ATEX, and IECEx standards for hazardous area installations.

Selection Guide & Purchasing Advice

When selecting a replacement or new probe, verify the thread size (3/8-24 UNF), total length (1.0 meter), and required approvals. The 330101-32-70-10-12-05 includes CSA, ATEX, and IECEx approvals, making it suitable for global use. For applications where oil leakage is a concern, the FluidLoc cable is a critical feature. AutoDCSTech offers this exact configuration with fast shipping and expert support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.