Bently Nevada 330101 Series Proximity Probes – 330101-00-72-20-02-CN

Technical Dossier

Product Details And Specifications

Bently Nevada 330101 Series Technical Notes

The Bently Nevada 330101 Series is a family of eddy-current proximity probes engineered for continuous, non-contact vibration and position measurement on rotating machinery. Deployed across global heavy industry — including petrochemical complexes, nuclear power stations, offshore platforms, and crude oil refineries — the 330101 Series forms a core sensing layer within Bently Nevada's 3300 XL and legacy 3300 System 5 machinery protection architectures. These probes operate on the eddy-current principle, generating a radio-frequency magnetic field that responds to changes in the distance between the probe tip and a conductive target surface. The resulting voltage signal is processed by a paired extension cable and proximitor (signal conditioner) to deliver shaft radial vibration, axial position, differential expansion, and eccentricity data to the plant DCS or safety instrumented system.

The Evolution of 330101 Architecture

The 330101 probe line descends from Bently Nevada's foundational eddy-current transducer work of the 1970s. The original 3300 System 5 platform established the 8 mm probe form factor and the -24 VDC proximitor supply standard that remains in use today. Through the 1990s, Bently Nevada refined the 3300 XL platform, introducing tighter manufacturing tolerances, extended temperature ratings, and improved EMI shielding — all backward-compatible with existing 3300 System 5 wiring infrastructure.

The 330101 SKU matrix encodes key configuration variables: probe body length, cable length, connector type, and armored vs. non-armored cable jacket. This modular encoding allows direct field substitution when the correct variant is specified. As the 3300 XL platform has entered its mature lifecycle phase, Bently Nevada has introduced the 3500 Series as the current-generation replacement architecture; however, the 330101 probe hardware remains fully compatible with 3500 Series proximitors via standard interconnect, extending the useful service life of existing probe installations by decades.

330101 Full Catalog & Functionalities (SKU List)

The following SKUs represent the principal configurations within the Bently Nevada 330101 8 mm Proximity Probe family. Each variant is defined by probe length, cable length, connector style, and jacket type.

330101-00-72-20-02-CN: 8 mm probe, 72-inch cable, standard connector, non-armored, metric tip — the subject SKU of this listing; radial vibration and axial position sensing.

330101-00-72-10-02-CN: 8 mm probe, 72-inch cable, 10 ft extension, non-armored jacket, standard metric connector; common radial vibration configuration.

330101-00-72-20-02-00: 8 mm probe, 72-inch integral cable, standard connector, non-armored; base configuration without CN suffix, North American market standard.

330101-00-72-10-02-00: 8 mm probe, 72-inch cable, 10 ft extension, non-armored; widely deployed on centrifugal compressor trains.

330101-00-72-20-01-00: 8 mm probe, 72-inch cable, armored jacket variant; specified for high-vibration or abrasive environments.

330101-00-72-10-01-00: 8 mm probe, 72-inch cable, 10 ft extension, armored jacket; used in gearbox and high-speed turbine applications.

330101-00-36-20-02-00: 8 mm probe, 36-inch integral cable, non-armored; short-cable variant for compact machinery housings.

330101-00-36-10-02-00: 8 mm probe, 36-inch cable, 10 ft extension, non-armored; standard short-reach radial probe.

330101-00-36-20-01-00: 8 mm probe, 36-inch cable, armored jacket; short-reach probe for harsh mechanical environments.

330101-00-36-10-01-00: 8 mm probe, 36-inch cable, 10 ft extension, armored; compact armored configuration for tight installations.

330101-00-72-20-02-05: 8 mm probe, 72-inch cable, non-armored, high-temperature rated tip; specified for steam turbine bearing housings above 120°C ambient.

330101-00-72-20-02-CN-05: High-temperature CN-suffix variant; metric connector, elevated thermal rating, petrochemical refinery standard.

330101-00-72-10-02-CN: 8 mm probe, 72-inch cable, 10 ft extension, CN connector; paired with 330130 extension cable for 5-meter system builds.

330101-00-36-20-02-CN: Short-cable CN-suffix probe; 36-inch integral cable, metric connector, non-armored; used in European and Asian OEM machinery.

330101-00-36-10-02-CN: 36-inch cable, 10 ft extension, CN connector, non-armored; standard short-reach metric configuration for compressor trains.

330101-00-72-20-02-CN-T: Teflon-jacketed cable variant; chemical-resistant outer jacket for corrosive atmosphere installations in chemical processing plants.

Quality Control for the 330101 Range

Each 330101 probe processed by DriveKNMS undergoes a structured inspection and functional verification protocol before dispatch. The procedure addresses the specific failure modes of eddy-current proximity probes: tip contamination, cable jacket degradation, connector pin corrosion, and drift in the probe's electrical center (scale factor deviation).