Bently Nevada 330101 Proximity Probe Modules - 330101-15-27-05-02-05

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 manufactured by Baker Hughes (formerly GE Bently Nevada), designed for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery. These probes are a core component of the 3300 XL monitoring system and are deployed across critical rotating equipment in petrochemical plants, refineries, nuclear power stations, LNG terminals, and offshore platforms worldwide.

The 330101 probe operates on the eddy-current principle: a high-frequency oscillating magnetic field is generated at the probe tip, and changes in the gap between the probe tip and a conductive target surface produce proportional changes in output voltage. Standard sensitivity is 7.87 mV/µm (200 mV/mil), with a linear measurement range of 0.25 mm to 2.25 mm (10 to 90 mil). The series is fully compatible with the 3300 XL 8mm Extension Cable (330130) and the 3300 XL Proximitor Sensor (330180), forming a calibrated three-component system.

The Evolution of 330101 Architecture

The 330101 series traces its lineage to the original Bently Nevada 7200 series probes introduced in the 1970s, which established the eddy-current proximity measurement standard for industrial turbomachinery. The 3300 series succeeded the 7200 series in the 1980s, introducing improved EMI shielding, tighter dimensional tolerances, and a standardized connector interface (TNC-type) that enabled field interchangeability across probe, cable, and Proximitor assemblies.

The 3300 XL generation, of which the 330101 is the primary probe family, was introduced in the mid-1990s and remains the current production standard. Key architectural changes from the legacy 3300 series include: a revised tip geometry for improved linearity at the extremes of the measurement range, an upgraded jacket material (ETFE/Tefzel) for enhanced chemical resistance in hydrocarbon and H2S environments, and a revised calibration protocol that ties probe, cable, and Proximitor as a matched system rather than interchangeable components.

Following the GE acquisition of Bently Nevada in 2002 and the subsequent Baker Hughes integration in 2017, the 330101 series has entered a mature lifecycle phase. Production continues for current variants, but several early 3300-series configurations have been discontinued. Plant operators running legacy 3300 (non-XL) systems face increasing difficulty sourcing direct replacements and must evaluate cross-compatibility with 3300 XL components or migrate to the current System 1 / 3701 platform.

330101 Full Catalog & Functionalities (SKU List)

The following SKUs represent the primary configurations within the Bently Nevada 330101 proximity probe series. Part numbers encode probe length, cable length, and connector/jacket options.

330101-00-06-10-02-00: 5 mm probe, 0.5 m integral cable, standard jacket, no armor, TNC connector.
330101-00-06-10-02-05: 5 mm probe, 0.5 m integral cable, standard jacket, armored, TNC connector.
330101-00-06-10-02-CN: 5 mm probe, 0.5 m integral cable, standard jacket, armored, CN connector variant.
330101-00-12-10-02-00: 5 mm probe, 1.0 m integral cable, standard jacket, no armor.
330101-00-12-10-02-05: 5 mm probe, 1.0 m integral cable, armored jacket, TNC connector.
330101-00-18-10-02-05: 5 mm probe, 1.5 m integral cable, armored, TNC connector.
330101-00-24-10-02-05: 5 mm probe, 2.0 m integral cable, armored, TNC connector.
330101-00-30-10-02-05: 5 mm probe, 2.5 m integral cable, armored, TNC connector.
330101-15-27-05-02-00: 8 mm probe, 2.25 m integral cable, standard jacket, no armor.
330101-15-27-05-02-05: 8 mm probe, 2.25 m integral cable, armored jacket, TNC connector — current listing SKU.
330101-15-27-10-02-05: 8 mm probe, 2.25 m integral cable, high-temperature jacket, armored.
330101-15-27-10-CN-05: 8 mm probe, 2.25 m integral cable, high-temperature jacket, CN connector.
330101-15-36-10-02-05: 8 mm probe, 3.0 m integral cable, high-temperature jacket, armored.
330101-15-48-10-02-05: 8 mm probe, 4.0 m integral cable, high-temperature jacket, armored.
330101-15-60-10-02-05: 8 mm probe, 5.0 m integral cable, high-temperature jacket, armored.
330101-15-72-10-02-05: 8 mm probe, 6.0 m integral cable, high-temperature jacket, armored.
330101-15-90-10-02-05: 8 mm probe, 7.5 m integral cable, high-temperature jacket, armored, extended-reach configuration.

Sourcing Hard-to-Find & Obsolete 330101 Parts

For plant operators running legacy 3300 (non-XL) systems, we provide cross-reference analysis to identify compatible 3300 XL replacements and document any recalibration requirements. For sites requiring exact OEM part number matches for regulatory or insurance compliance (common in nuclear and offshore applications), we maintain traceability documentation including original manufacturer certificates of conformance where available.

Quality Control for the 330101 Range

Each 330101 probe processed through DriveKNMS undergoes a structured verification protocol prior to dispatch. Static gap voltage output is measured across the full linear range (0.25 mm to 2.25 mm) using a calibrated target fixture and a reference 3300 XL Proximitor, with output linearity verified against the OEM specification of ±0.5% full scale. Sensitivity is confirmed at 7.87 mV/µm ±0.1 mV/µm.

Cable jacket integrity is inspected for cuts, abrasion, and chemical degradation. Connector bodies are inspected for thread damage and center pin alignment. Armored variants are checked for armor continuity and end-termination integrity. Units with integral cables are tested for shield continuity and insulation resistance (minimum 100 MΩ at 500 VDC).