Bently Nevada 330105-02-12-10-02-00 | 3300 XL 8mm Reverse Mount Proximity Probe

Bently Nevada 330105-02-12-10-02-00 Reverse Mount Proximity Probe

The Bently Nevada 330105-02-12-10-02-00 is a precision 8mm reverse mount proximity probe engineered for critical turbomachinery monitoring applications. Part of the proven 3300 XL platform, this sensor delivers accurate shaft displacement and vibration measurements in space-constrained installations where traditional probe mounting is impractical.

Technical Parameters

• Part Number: 330105-02-12-10-02-00
• Probe Diameter: 8mm (0.315 inches)
• Total Length: 3.05 meters (10 feet)
• Probe Length: 305mm (12 inches)
• Cable Length: 2.74 meters
• Thread Type: M12 — 1.5 reverse mount configuration
• Operating Temperature: -40 °C to +177 °C (-40 °F to +350 °F)
• Linear Range: 2.0mm (0.080 inches) typical
• System Compatibility: 3300 XL Proximitor ® sensors
• Compliance Standards: API 670 fifth edition, ISO 20816
• Housing Material: Stainless steel with PEEK insulation

Application Scenarios

This reverse mount probe excels in challenging installation environments:

• Compressor Monitoring: Ideal for centrifugal and axial compressors where bearing housing access is limited from the front
• Steam & Gas Turbines: Monitors shaft position and radial vibration in high-temperature turbine applications up to 177 °C
• Generator Sets: Provides critical displacement measurements on large rotating generators with restricted mounting access
• Pump Applications: Monitors thrust position and radial vibration on multi-stage pumps in petrochemical facilities
• Retrofit Projects: Enables sensor installation in existing machinery where conventional probe mounting requires extensive modifications

Solution Advantages

The reverse mount design solves critical installation challenges:

• Space-Saving Configuration: Mounts from the rear of bearing housings, eliminating front-access requirements and reducing installation footprint
• Enhanced Reliability: Factory-assembled probe and cable assembly eliminates field termination errors and ensures consistent performance
• Temperature Resilience: PEEK insulation withstands continuous operation at elevated temperatures common in turbomachinery environments
• API 670 Conformity: Meets stringent petroleum and natural gas industry requirements for machinery protection systems
• System Integration: Seamlessly interfaces with 3300 XL Proximitor sensors and 3500 monitoring systems for complete machinery protection

Installation & Configuration

The reverse mount probe installs through the rear of bearing housings using M12 — 1.5 threading. Proper installation requires gap voltage verification between 8-10 Vdc at operating clearance. The 2.74-meter integral cable connects directly to 3300 XL Proximitor sensors or extension cables for longer runs. Always verify target material conductivity and surface finish meet API 670 specifications before commissioning.

Common Questions & Answers

Q: What distinguishes a reverse mount probe from standard proximity probes?
A: Reverse mount probes install from the back of bearing housings rather than the front, making them ideal for retrofits and space-constrained applications. The sensing tip extends forward while the cable exits rearward, opposite of conventional probes.

Q: Can I use this probe with my existing 3300 XL Proximitor sensors?
A: Yes, the 330105-02-12-10-02-00 is fully compatible with all 3300 XL Proximitor sensor models. The probe connects directly to the Proximitor input, which provides the -24 Vdc excitation and signal conditioning.

Q: What target material requirements must be met?
A: The target shaft must be ferromagnetic material (typically 4140 or 4340 steel) with surface finish better than 32 micro-inches Ra. Non-magnetic stainless steels and aluminum are not suitable targets for eddy current proximity probes.

Q: How do I extend the cable length if needed?
A: Use Bently Nevada 3300 XL extension cables (part numbers 330130 series) to extend total system length up to 9 meters. Never splice or modify the factory-assembled probe cable, as this voids calibration and warranty.

Q: What warranty coverage is provided?
A: Each probe includes a comprehensive 12-month warranty covering manufacturing defects and workmanship. The warranty includes factory calibration verification and technical support for installation and troubleshooting.

Q: Is factory calibration documentation included?
A: Yes, every probe ships with calibration data traceable to NIST standards, including gap voltage curves and linearity specifications required for API 670 compliance documentation.

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Quality & Compliance

All reverse mount probes undergo rigorous factory testing including gap voltage verification, linearity testing across the full measurement range, and temperature cycling to ensure performance stability. Each unit is individually serialized with full traceability to manufacturing batch records and calibration certificates.

Warranty & Technical Support

12-Month Comprehensive Warranty: Full coverage includes replacement parts, technical consultation, and application engineering support. Our team provides installation guidance, gap setting procedures, and system integration assistance throughout the warranty period and beyond.

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