Bently Nevada 330101 Proximity Probe Modules - 330101-00-77-20-02-CN

Technical Dossier

Product Details And Specifications

Bently Nevada 330101 Series Technical Notes

The Bently Nevada 330101 series represents one of the most widely deployed proximity probe families in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore platforms, LNG terminals, and rotating machinery monitoring systems, the 330101 probe is the field-sensing front end of the 3300 XL and legacy 3300 Series machinery protection systems. These probes operate on the eddy-current principle, converting shaft displacement and vibration into a linear voltage signal processed by companion extension cables and Proximitor® sensors. Their presence in critical turbine, compressor, and pump monitoring applications means that lifecycle support — including sourcing of discontinued configurations — is a primary operational requirement for maintenance engineers worldwide.

The Evolution of 330101 Architecture

The 330101 probe family was introduced as part of Bently Nevada's 3300 Series platform, which established the industry standard for eddy-current proximity measurement in the 1980s and 1990s. Early variants used a fixed 5-meter or 9-meter integral cable with a standard 8 mm tip diameter, targeting general-purpose radial vibration and axial position measurement on steam turbines and centrifugal compressors. As plant designs evolved, Bently Nevada expanded the 330101 catalog to accommodate varying probe tip diameters (5 mm, 8 mm, 11 mm), cable lengths (1 m, 5 m, 9 m), connector types (standard, armored, high-temperature), and target material compatibility (steel, non-ferrous). The introduction of the 3300 XL platform in the 2000s brought tighter linearity specifications and extended temperature ratings, while maintaining backward compatibility with existing 3300 Series Proximitor® sensors and field wiring. Many 330101 configurations have since been classified as mature or end-of-life by Bently Nevada (now a Baker Hughes company), making third-party sourcing and certified refurbishment essential for plants committed to long-term asset integrity without full system replacement.

330101 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed configurations within the Bently Nevada 330101 proximity probe series, organized by probe geometry and cable specification:

330101-00-77-20-02-CN: 8 mm probe, 5 m cable, standard connector, general-purpose radial vibration.
330101-00-77-20-02-00: 8 mm probe, 5 m cable, no connector, bare-end termination for custom wiring.
330101-00-77-20-02-05: 8 mm probe, 5 m cable, armored jacket, high-vibration environment.
330101-00-77-20-09-CN: 8 mm probe, 9 m cable, standard connector, extended reach installation.
330101-00-77-20-09-00: 8 mm probe, 9 m cable, bare-end, field-terminated installations.
330101-00-77-20-01-CN: 8 mm probe, 1 m cable, standard connector, short-reach or retrofit applications.
330101-00-77-05-02-CN: 5 mm probe tip, 5 m cable, standard connector, small-bore shaft monitoring.
330101-00-77-05-09-CN: 5 mm probe tip, 9 m cable, standard connector, small-shaft extended reach.
330101-00-77-11-02-CN: 11 mm probe tip, 5 m cable, standard connector, large-shaft or high-sensitivity applications.
330101-00-77-11-09-CN: 11 mm probe tip, 9 m cable, standard connector, large-shaft extended reach.
330101-00-77-20-02-HT: 8 mm probe, 5 m cable, high-temperature rated, up to 177°C ambient.
330101-00-77-20-09-HT: 8 mm probe, 9 m cable, high-temperature rated, furnace or hot-section proximity.
330101-00-77-20-02-AR: 8 mm probe, 5 m armored cable, mechanical protection in harsh environments.
330101-00-77-20-09-AR: 8 mm probe, 9 m armored cable, extended armored run for compressor trains.
330101-00-77-05-02-HT: 5 mm probe, 5 m cable, high-temperature, small-shaft hot-section monitoring.
330101-00-77-11-02-AR: 11 mm probe, 5 m armored cable, large-shaft high-vibration installations.