Bently Nevada 330500 Series Piezo-Velocity Sensors – 330500-02-01

Technical Dossier

Product Details And Specifications

Bently Nevada 330500 Series Technical Notes

The Bently Nevada 330500 Series Piezo-Velocity Sensors are precision vibration measurement transducers engineered for continuous deployment in heavy industrial environments. These sensors are installed across global critical infrastructure including petrochemical refineries, nuclear power stations, offshore platforms, and large-scale chemical processing facilities. The 330500 Series operates as a core component within Bently Nevada's 3300 System architecture, providing velocity-based vibration signals compatible with the 3300 XL and ADAPT.wind monitoring platforms. Their robust stainless-steel construction and wide operating temperature range make them a standard specification in rotating machinery protection systems worldwide, including steam turbines, compressors, pumps, and fans operating under API 670 machinery protection standards.

The Evolution of 330500 Series Architecture

The 330500 Series was introduced as part of Bently Nevada's third-generation vibration monitoring platform, designed to replace earlier velocity transducer designs that relied on electrodynamic (moving-coil) technology. The shift to piezoelectric sensing elements provided a significant improvement in high-frequency response, eliminating the mechanical resonance limitations inherent in earlier designs.

Early 330500 variants were designed for direct integration with the 3300 Series monitoring racks using 4-wire shielded cable configurations. Subsequent revisions introduced extended cable length options and improved EMI shielding to address compatibility requirements in high-noise industrial environments such as motor control centers and variable frequency drive (VFD) installations.

As the 3300 System platform matured into the System 1 software ecosystem, the 330500 Series maintained backward compatibility with legacy rack-mounted monitors including the 3300/16 and 3300/20 series. Current installations frequently interface with the 3500 Series monitoring system via signal conditioning modules, extending the operational life of 330500 sensors in modernized plant environments. The series is now in a mature/end-of-production lifecycle phase; Baker Hughes (Bently Nevada) no longer actively manufactures all variants, making third-party MRO sourcing critical for long-term plant maintenance programs.

330500 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented 330500 Series product range. Each model is differentiated by cable length, connector type, and mounting configuration:

330500-02-01: Piezo-velocity sensor, 2m integral cable, standard industrial connector, 100 mV/in/s sensitivity.
330500-02-05: Piezo-velocity sensor, 5m integral cable, standard connector, 100 mV/in/s sensitivity.
330500-02-10: Piezo-velocity sensor, 10m integral cable, extended reach for remote mounting applications.
330500-02-15: Piezo-velocity sensor, 15m integral cable, suitable for large turbine housings.
330500-02-20: Piezo-velocity sensor, 20m integral cable, long-run installation variant.
330500-02-25: Piezo-velocity sensor, 25m integral cable, maximum standard cable length option.
330500-03-01: Piezo-velocity sensor, 2m cable, armored cable jacket for high-abrasion environments.
330500-03-05: Piezo-velocity sensor, 5m armored cable, chemical plant and refinery specification.
330500-03-10: Piezo-velocity sensor, 10m armored cable, extended armored variant.
330500-04-01: Piezo-velocity sensor, 2m cable, high-temperature housing rated to 120°C continuous.
330500-04-05: Piezo-velocity sensor, 5m cable, high-temperature variant for steam turbine bearing housings.
330500-05-01: Piezo-velocity sensor, 2m cable, stainless steel body, ATEX/IECEx certified for Zone 1 hazardous areas.
330500-05-05: Piezo-velocity sensor, 5m cable, ATEX Zone 1, suitable for gas compression facilities.
330500-06-01: Piezo-velocity sensor, 2m cable, side-exit connector configuration for restricted mounting clearance.
330500-06-05: Piezo-velocity sensor, 5m cable, side-exit connector, extended cable variant.
330500-07-01: Piezo-velocity sensor, 2m cable, metric thread mounting (M8), European plant specification.
330500-08-01: Piezo-velocity sensor, 2m cable, dual-output configuration for redundant monitoring channels.
330500-09-01: Piezo-velocity sensor, 2m cable, low-frequency optimized variant, 2–1000 Hz response range.

Quality Control for the 330500 Series Range

Each 330500 Series sensor processed through DriveKNMS undergoes a structured inspection and functional verification protocol prior to shipment:

Visual and Mechanical Inspection: Housing integrity check, cable jacket condition assessment, connector pin inspection, and thread gauge verification for mounting compatibility.
Sensitivity Verification: Output sensitivity (mV/in/s or mV/mm/s) is verified against the manufacturer's published specification using a calibrated reference shaker at 79.6 Hz (500 RPM equivalent).
Frequency Response Check: Swept-sine testing across the rated frequency band (typically 2 Hz to 1000 Hz) to confirm flat response within ±3 dB tolerance.
Insulation Resistance Test: Cable shield and conductor insulation resistance measured at 500 VDC to detect cable degradation or moisture ingress.
Connector Continuity Test: Pin-to-pin continuity verified against the 330500 wiring diagram to confirm correct signal and shield routing.
Bias Voltage Check: Internal IEPE circuit bias voltage measured to confirm active element functionality prior to dispatch.