Bently Nevada 330104 Proximity Probe Modules - 330104-00-08-90-02-CN

Technical Dossier

Product Details And Specifications

Bently Nevada 330104 Series Technical Notes

The Bently Nevada 330104 series is a standardized line of proximity probes engineered for continuous, non-contact vibration and position measurement in rotating machinery. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, offshore platforms, and LNG processing facilities — the 330104 series forms a core sensing layer within Bently Nevada's 3300 XL and legacy 3300 monitoring systems. These probes operate on the eddy-current principle, converting shaft displacement into a linear voltage signal compatible with Bently Nevada proximitor/extension cable assemblies. Their metric-dimensioned variants are the dominant specification in Asian and European installations, where shaft and housing tolerances follow ISO standards. The 330104 series is recognized by API 670 compliance bodies as a qualified sensor for machinery protection systems in turbines, compressors, pumps, and gearboxes.

The Evolution of 330104 Architecture

The 330104 series was introduced as part of Bently Nevada's third-generation 3300 platform, succeeding the earlier 7200 and 3000 series probes that used imperial dimensions and proprietary connector formats. The 330104 design standardized on an 8 mm probe tip diameter with metric thread bodies (M10×1 or M14×1.5 depending on sub-model), enabling direct retrofit into ISO-compliant bearing housings without adapter sleeves.

Early 330104 variants shipped with a fixed 5-meter integral cable and a two-pin MIL-spec connector. Subsequent revisions introduced field-selectable cable lengths (1 m, 3 m, 5 m, 9 m) and a transition to the standard Bently Nevada coaxial connector, improving interchangeability with 3300 XL proximitor modules (e.g., 330180, 330130). The metric sub-series (suffix -CN, -00) was formalized to address Chinese national standards for nuclear and petrochemical installations, where dimensional traceability to GB/T specifications is required for regulatory audit.

By the mid-2010s, Bently Nevada (then under Baker Hughes / GE Measurement & Control) began transitioning customers toward the 330900 and 330980 series for new installations, offering extended temperature ranges and integrated TEDS (Transducer Electronic Data Sheet) capability. However, the 330104 series remains in active production for legacy system maintenance and is the only probe series with full backward compatibility to pre-2000 Bently Nevada rack systems without signal conditioning adapters.

330104 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified, commercially available models within the Bently Nevada 330104 proximity probe series. Each entry reflects a distinct configuration of cable length, connector type, and dimensional standard.

330104-00-06-10-02-00: 5 mm probe, 0.6 m cable, standard connector, imperial thread, general-purpose radial vibration measurement.
330104-00-06-10-02-CN: 5 mm probe, 0.6 m cable, CN-spec connector, metric thread, China nuclear/petrochemical compliance variant.
330104-00-08-05-02-00: 8 mm probe, 0.5 m cable, standard connector, imperial, short-range axial position sensing.
330104-00-08-10-02-00: 8 mm probe, 1.0 m cable, standard connector, imperial, radial vibration — most common North American specification.
330104-00-08-10-02-CN: 8 mm probe, 1.0 m cable, CN-spec, metric thread, radial vibration for Asian market installations.
330104-00-08-30-02-00: 8 mm probe, 3.0 m cable, standard connector, imperial, extended-reach installations in large bearing housings.
330104-00-08-30-02-CN: 8 mm probe, 3.0 m cable, CN-spec, metric, standard specification for Chinese refinery and power plant OEM builds.
330104-00-08-50-02-00: 8 mm probe, 5.0 m cable, standard connector, imperial, turbine pedestal installations requiring long probe-to-proximitor runs.
330104-00-08-50-02-CN: 8 mm probe, 5.0 m cable, CN-spec, metric — the current product on this listing; dominant SKU in Chinese nuclear and LNG facilities.
330104-00-08-90-02-00: 8 mm probe, 9.0 m cable, standard connector, imperial, used in large steam turbine installations with remote proximitor mounting.
330104-00-08-90-02-CN: 8 mm probe, 9.0 m cable, CN-spec, metric, long-cable variant for Chinese power generation and offshore compressor trains.
330104-00-14-05-02-00: 14 mm probe, 0.5 m cable, standard connector, imperial, high-sensitivity axial thrust measurement on large shaft diameters.
330104-00-14-10-02-00: 14 mm probe, 1.0 m cable, standard connector, imperial, radial vibration on large-bore journal bearings in compressors and generators.
330104-00-14-30-02-00: 14 mm probe, 3.0 m cable, standard connector, imperial, extended-reach configuration for large turbine casings.
330104-00-14-50-02-00: 14 mm probe, 5.0 m cable, standard connector, imperial, used in API 670-compliant machinery protection systems on large rotating equipment.
330104-00-14-90-02-00: 14 mm probe, 9.0 m cable, standard connector, imperial, maximum-length variant for remote-mounted proximitor racks in large power stations.
330104-00-14-90-02-CN: 14 mm probe, 9.0 m cable, CN-spec, metric, large-diameter shaft monitoring in Chinese nuclear turbine installations.

Quality Control for the 330104 Range

Each 330104 probe processed through DriveKNMS undergoes a structured verification protocol before dispatch review. The eddy-current sensitivity is measured against the Bently Nevada standard scale factor of -7.87 V/mm (200 mV/mil) using a calibrated target material (AISI 4140 steel) at controlled gap distances from 0.25 mm to 2.54 mm. Output linearity is verified across the full measurement range, and any unit exhibiting deviation greater than ±1% from the nominal scale factor is rejected.

Cable continuity and insulation resistance are tested on all integral-cable variants, with particular attention to the coaxial shield integrity at the probe body junction — a known failure point on aged units exposed to high-vibration environments. Connector pin engagement force and contact resistance are measured on all units with field-replaceable connectors. Units sourced from decommissioned plant assets are additionally subjected to a 72-hour burn-in cycle at elevated temperature (70°C) to screen for latent failures before dispatch.

All test data is retained and available for customer review upon request. Certificates of conformance referencing the specific test parameters and measured values are issued with each shipment.