Comprehensive Technical Documentation for Bently Nevada 330104-03-18-50-02-RU

Product Overview

The Bently Nevada 330104-03-18-50-02-RU is a high-performance proximity probe system designed for non-contact displacement and vibration measurement in rotating machinery. This model belongs to the 3300 XL 8mm Proximity Probe family, widely recognized for its exceptional linearity, thermal stability, and durability in harsh industrial environments. The probe operates on the eddy current principle, converting physical displacement into an electrical signal proportional to the gap between the probe tip and the target surface.

The 330104-03-18-50-02-RU is a reverse mount configuration, meaning the probe cable exits from the rear of the probe housing, allowing for easier installation in confined spaces where standard side-exit probes cannot fit. It is typically used with a matching proximitor and extension cable to form a complete monitoring channel.

Product Parameters

Product Applications

The 330104-03-18-50-02-RU is used extensively in condition monitoring and protective systems for critical rotating machinery. Typical applications include:

• Radial Vibration Measurement on journal bearings of steam turbines, gas turbines, compressors, and pumps.

• Axial (Thrust) Position Monitoring to detect thrust bearing wear and prevent rotor-stator rub.

• Eccentricity Measurement on turbine rotors during startup and shutdown.

• Differential Expansion Monitoring between rotor and casing in large steam turbines.

• Shaft Phase Reference for balancing and torsional vibration analysis using keyphasor signals.

• Gap Voltage Monitoring for seal and clearance control in high-speed rotating equipment.

• Bearing Wear Detection through DC gap trend analysis.

• Overspeed Protection Systems when used with a speed sensing proximitor.

This reverse mount configuration is particularly valuable in retrofit applications where existing probe holes do not accommodate standard side-exit cables, such as in legacy power plants, refineries, and offshore platforms.

Product Advantages

• Reverse Mount Design allows cable routing from the rear, simplifying installation in tight machine casings.

• High Thermal Stability maintains consistent sensitivity across a wide temperature range without recalibration.

• Hermetic Sealing prevents oil, steam, and chemical ingress, ensuring reliability in wet or corrosive environments.

• Integrated Armored Cable resists abrasion, crushing, and fluid absorption, extending service life.

• Interchangeability with all 3300 XL proximitors and extension cables without recalibration.

• Precision Linear Range from 0 to 2 mm with industry-leading ±0.2% linearity error.

• Reverse Polarity Protection built into compatible proximitors prevents damage from installation errors.

• Easy Gap Setup using DC voltage output eliminates the need for micrometers in routine installations.

• Failsafe Design tolerates accidental cable shorting or open circuits without damage.

• Low Weight (0.18 kg) reduces mechanical stress on probe mounting brackets.

Brand Information

The product is manufactured under the Bently Nevada brand. Bently Nevada is the original inventor of the proximity probe and remains the global benchmark for machinery protection and condition monitoring systems. The brand is synonymous with high-reliability sensors, monitoring racks, and diagnostic software for rotating machinery.

Product Series

The 330104-03-18-50-02-RU belongs to the 3300 XL 8mm Proximity Probe Series. This series includes:

• 3300 XL 8mm Probes (standard side exit and reverse mount)

• 3300 XL 8mm Extension Cables (various lengths)

• 3300 XL 8mm Proximitors (signal conditioners)

Key features of the 3300 XL series include superior radio frequency interference (RFI) immunity, high temperature stability, and compatibility with older 3300 and 7200 series systems via adapters.

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