Bently Nevada 330105-02-12-05-02-00 | 3300 XL 8mm Reverse Mount Proximity Probe

Most standard proximity probes rely on forward mounting, which fails to fit machinery with enclosed bearing housings, internal mounting cavities or limited forward operating space. The Bently Nevada 330105-02-12-05-02-00 solves this industry pain point with a professional reverse mounting design, belonging to the premium 3300 XL 8mm eddy current sensor series. Unlike conventional straight, threaded or extended-tip probes, this reverse mount structure allows installation from the back side of equipment mounting plates, perfectly adapting to confined internal installation environments that block front-side assembly. Matched with 12-meter integrated cable and standard linear range parameters, it delivers stable and accurate non-contact displacement and vibration monitoring data for high-speed rotating equipment in power and petrochemical industries, fully compatible with mainstream Bently Nevada TSI system configurations.

Unique Structural & Electrical Specifications

Full Model Number：330105-02-12-05-02-00

Product Type：8mm reverse mounting eddy current proximity probe

Core Structural Feature：Back-mounted reverse installation design, exclusive for enclosed and hidden mounting positions

Mounting Thread Standard：3/8-24 UNF industrial standard thread, stable locking and anti-loosening performance

Measurement Principle：High-frequency eddy current electromagnetic induction, no contact wear, no mechanical interference

Factory Calibration Sensitivity：7.87 V/mm (200 mV/mil), consistent with 3300 XL series unified calibration standard

Valid Linear Measurement Range：0–2mm standard range, covering conventional shaft vibration and thrust displacement monitoring requirements

Integrated Cable Configuration：12-meter one-piece molded cable, suitable for large-span field wiring and remote cabinet arrangement

Operating Temperature Scope：-40℃ to +85℃, stable output under complex industrial temperature changes

Measuring Object Adaptation：Ferromagnetic metal rotors of turbines, compressors and other core rotating equipment

Body Material：Hermetically sealed stainless steel structure, dust-proof, oil-resistant and corrosion-resistant for long-term industrial operation

Environmental Certification：ATEX、IECEx、CSA hazardous area explosion-proof certification, applicable to flammable and explosive industrial sites

On-Site Oriented Model Code Interpretation

Each segment of the model code corresponds to actual installation and configuration attributes, helping engineering and maintenance staff quickly confirm matching applicability before on-site construction, avoiding model mismatch risks:

Supporting System Matching Combination

Eddy current probe monitoring systems require complete supporting hardware to form a valid data acquisition loop. The matching accessories for this reverse mount probe are highly targeted to adapt to its special installation method:

• 330180 series proximitor sensor: Converts real-time gap variation signals between probe and rotor into standard linear voltage signals for system acquisition

• 330130 dedicated extension cable: Auxiliary wiring for ultra-long distance transmission when the original 12-meter cable is insufficient

• Reverse mount special locking fasteners: Custom gaskets and lock nuts for back-side installation, preventing probe offset caused by long-term equipment vibration

• 3500/42, 3500/45 monitoring modules: Collect vibration and thrust displacement data, realize real-time monitoring, over-limit alarm and safety interlock protection functions

Core Application Advantages of Reverse Mount Structure

The biggest highlight of the 330105-02-12-05-02-00 probe is its exclusive reverse mounting capability, which fills the installation gap of traditional forward probes. For equipment with closed bearing boxes and internal hidden mounting holes, front assembly is impossible, and this back-side mounting scheme can complete fixed installation without modifying the original equipment structure, greatly reducing renovation and construction costs.

Equipped with a 12-meter ultra-long integrated cable, it avoids intermediate wiring joints, effectively reducing signal drift and intermittent fault problems caused by on-site wiring. The standard linear range and unified factory calibration ensure high consistency and repeatability of monitoring data. The non-contact measurement method has no mechanical friction loss, supporting 7×24-hour uninterrupted online monitoring for a long time, lowering later maintenance and replacement frequency.

Main Industrial Application Scenarios

This reverse mount probe is widely used in equipment renovation and hidden monitoring scenarios in thermal power and petrochemical industries. It is mostly applied to steam turbine units with closed bearing housings, solving the installation difficulty of internal monitoring points that cannot be constructed from the front. In petrochemical plants, it matches high-speed centrifugal compressors and turbo expanders with compact internal structures, realizing accurate monitoring of shaft vibration and thrust displacement.

It is also the preferred replacement model for aging TSI system overhaul projects. It can be directly installed and matched without changing the original equipment hole position and system parameters, with strong compatibility and high on-site promotion value, ensuring stable and safe operation of industrial rotating equipment.