Bently Nevada 330105 Proximity Probes – 330105-02-12-05-12-05

Technical Dossier

Product Details And Specifications

Bently Nevada 330105 Series Technical Notes

The Bently Nevada 330105 Series comprises eddy-current proximity probes engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, LNG terminals, and offshore platforms — the 330105 product line forms a core sensing layer within Bently Nevada's 3300 XL and legacy 3300 Series monitoring systems. These probes are rated for operation in hazardous areas (ATEX / IECEx certified variants available) and are designed for direct integration with 3300 Series proximitor/oscillator signal conditioning modules. The 330105 family is a mature, widely installed platform with an extensive installed base across API 670-compliant machinery protection systems worldwide.

The Evolution of 330105 Architecture

The 330105 probe series was developed as part of Bently Nevada's standardized 3300 XL transducer system, succeeding earlier 7200 and 3300 Series probes. The 3300 XL system introduced tighter gap voltage tolerances (nominally -10.0 VDC at 1.0 mm gap with a sensitivity of 7.87 V/mm), improved EMI shielding, and extended cable options to accommodate complex machinery layouts. The 330105 probes use an 8 mm tip diameter and are designed to interface exclusively with 330130 and 330180 Series extension cables and 330101/330103 proximitor modules — forming a matched, calibrated transducer system. Early variants used armored integral cable; later revisions introduced field-replaceable connector options and extended temperature ratings. Compatibility with legacy 3300 Series proximitors requires verification of gap voltage and scale factor alignment. The series is now in a mature/end-of-active-production lifecycle; Bently Nevada (Baker Hughes) continues to supply spare parts and repair services, but new platform development has migrated toward the System 1 / 3701 architecture. Long-term maintenance support for 330105-based installations is a primary procurement driver for operators committed to existing infrastructure.

330105 Full Catalog & Functionalities (SKU List)

The following SKUs represent the most commonly sourced models within the 330105 Series. Each model designation encodes probe length, cable length, connector type, and mounting configuration. All are eddy-current proximity probes with 8 mm tip diameter and standard 3300 XL system compatibility.

330105-02-12-05-12-05: Reverse mount, 2 in. probe, 5 ft integral cable, standard connector — the subject SKU; radial vibration measurement in tight-clearance bearing housings.
330105-02-12-10-02-00: Reverse mount, 2 in. probe, 10 ft cable; extended reach for deep-set bearing pedestals.
330105-02-12-05-02-00: Standard mount, 2 in. probe, 5 ft cable; general-purpose radial vibration sensing.
330105-02-12-10-05-05: Reverse mount, 2 in. probe, 10 ft cable, armored jacket; high-vibration environments.
330105-02-12-25-02-00: Standard mount, 2 in. probe, 25 ft cable; long-run installations on large turbine decks.
330105-02-12-05-05-05: Reverse mount, 5 ft cable, dual-connector; redundant measurement configurations.
330105-02-12-10-05-00: Reverse mount, 10 ft cable, single connector; axial position monitoring on compressor trains.
330105-02-12-05-02-05: Standard mount, 5 ft cable, armored; chemical plant corrosive-atmosphere installations.
330105-02-12-15-02-00: Standard mount, 15 ft cable; medium-distance routing in power generation turbines.
330105-02-12-20-02-00: Standard mount, 20 ft cable; large frame gas turbine shaft monitoring.
330105-02-12-05-08-00: Reverse mount, 5 ft cable, high-temperature rated; steam turbine bearing housings up to 177°C.
330105-02-12-10-08-00: Reverse mount, 10 ft cable, high-temperature; nuclear auxiliary feedwater pump monitoring.
330105-02-12-25-05-05: Reverse mount, 25 ft cable, armored, dual connector; offshore platform critical machinery.
330105-02-12-05-12-00: Reverse mount, 5 ft cable, standard connector, non-armored; replacement for legacy 3300 Series installations.
330105-02-12-10-12-05: Reverse mount, 10 ft cable, standard connector, armored; refinery process compressor trains.
330105-02-12-15-05-00: Standard mount, 15 ft cable, single connector; hydro turbine guide bearing radial vibration.
330105-02-12-30-02-00: Standard mount, 30 ft cable; maximum-length standard configuration for large machinery enclosures.