Bently Nevada 330900 Series Modules – 330906-02-12-05-02-00 NSv Reverse Mount Probe

Technical Dossier

Product Details And Specifications

Bently Nevada 330900 Series Technical Notes

The Bently Nevada 330900 Series represents one of the most widely deployed eddy-current proximity probe systems in global heavy industry. Installed across petrochemical refineries, nuclear power stations, LNG terminals, offshore platforms, and rotating machinery facilities, the 330900 Series forms the sensing backbone of Bently Nevada's 3300 and System 1 condition monitoring architectures. These probes operate on the eddy-current principle to deliver non-contact, continuous measurement of shaft radial vibration, axial position, and differential expansion — parameters that are mandatory under API 670 machinery protection standards.

The 330900 Series is engineered for environments where measurement reliability is non-negotiable: high-temperature bearing housings, high-pressure turbine casings, and chemically aggressive atmospheres. The NSv (Non-Standard voltage) reverse-mount configuration, as represented by 330906-02-12-05-02-00, is specifically designed for installations where the probe must be inserted from the back of the mounting bracket, a geometry common in retrofitted machinery or space-constrained bearing pedestals.

The Evolution of 330900 Series Architecture

The 330900 Series was introduced as part of Bently Nevada's transition from the legacy 7200 Series probe systems toward a unified, API 670-compliant sensing platform. Early 330900 variants used standard voltage (Sv) output configurations compatible with the 3300 XL 8mm proximitor sensor drivers. As machinery OEMs began specifying tighter installation envelopes, Bently Nevada introduced the NSv (Non-Standard voltage) sub-family, which operates with modified sensitivity coefficients and requires matched NSv-designated proximitor drivers — the two are not interchangeable without recalibration.

Compatibility note: 330900 Series probes require matched extension cables (330130 Series) and proximitor sensors (3300 XL 8mm or equivalent NSv-rated drivers). Mixing Sv and NSv components without system reconfiguration will produce calibration errors and false trips.

330900 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced configurations within the Bently Nevada 330900 Series. All are eddy-current proximity probes in the 8mm tip diameter class unless otherwise noted.

330906-02-12-05-02-00: NSv reverse-mount probe, 12-inch cable, 5-meter extension, standard connector, no armor — the subject of this listing.
330906-00-12-05-02-00: NSv standard-mount probe, 12-inch integral cable, 5-meter extension, unarmored.
330906-02-24-05-02-00: NSv reverse-mount probe, 24-inch integral cable, 5-meter extension, unarmored.
330906-02-12-10-02-00: NSv reverse-mount probe, 12-inch cable, 10-meter extension, unarmored.
330906-02-12-05-02-05: NSv reverse-mount probe, 12-inch cable, 5-meter extension, armored cable variant.
330905-02-12-05-02-00: Sv (standard voltage) reverse-mount probe, 12-inch cable, 5-meter extension — requires Sv-rated proximitor.
330905-00-12-05-02-00: Sv standard-mount probe, 12-inch integral cable, 5-meter extension.
330905-02-24-05-02-00: Sv reverse-mount probe, 24-inch integral cable, 5-meter extension.
330905-02-12-10-02-00: Sv reverse-mount probe, 12-inch cable, 10-meter extension, unarmored.
330905-02-12-05-02-05: Sv reverse-mount probe, 12-inch cable, 5-meter extension, armored cable.
330904-02-12-05-02-00: 5mm tip diameter NSv reverse-mount probe, compact bearing housing applications.
330903-02-12-05-02-00: 3mm tip diameter NSv reverse-mount probe, high-frequency response variant.
330130-080-00-00: 330900 Series matched extension cable, 8-meter, unarmored — required accessory.
330130-050-00-00: 330900 Series matched extension cable, 5-meter, unarmored.
330130-100-00-05: 330900 Series matched extension cable, 10-meter, armored, high-vibration conduit grade.
330180-91-00: 3300 XL 8mm NSv Proximitor Sensor — the matched driver module for NSv 330900 probes.
330180-90-00: 3300 XL 8mm Sv Proximitor Sensor — matched driver for standard-voltage 330900 probes.

Sourcing Hard-to-Find & Obsolete 330900 Series Parts

DriveKNMS maintains a dedicated inventory of 330900 Series probes, extension cables, and proximitor sensors sourced from decommissioned plant shutdowns, OEM overstock, and certified refurbishment pipelines. Our procurement team cross-references part number suffixes against Bently Nevada's configuration matrices to ensure that NSv and Sv variants are never substituted without explicit customer authorization. For plants operating under API 670 machinery protection requirements, we provide full traceability documentation upon request.

Quality Control for the 330900 Series Range

The 330900 Series probe system presents specific quality verification challenges due to the interdependency between probe tip geometry, integral cable impedance, extension cable characteristics, and proximitor driver calibration. A probe that passes basic continuity testing may still produce out-of-specification output if the cable assembly has been subjected to mechanical damage, thermal cycling fatigue, or connector corrosion.

DriveKNMS applies the following verification protocol to all 330900 Series units prior to dispatch: (1) Tip impedance measurement at 1 MHz to verify eddy-current coil integrity against Bently Nevada factory specification bands. (2) Cable insulation resistance test at 500V DC across the full integral-plus-extension cable assembly. (3) System-level calibration check using a matched proximitor driver and calibrated target material (AISI 4140 steel) to verify output sensitivity within ±0.5% of the nominal scale factor. (4) Connector pin-out verification against Bently Nevada wiring diagrams for the specific suffix configuration. (5) Visual inspection of probe tip, cable jacket, and connector body for mechanical damage, corrosion, or unauthorized repair. Units that do not pass all five stages are quarantined and not offered for sale.