Model: 330881-16-04-132-03-02
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Commercial Path
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Technical Dossier
The Bently Nevada 330881 Series proximity transducer system is a precision eddy-current sensing solution 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 processing facilities, offshore platforms, and large-scale thermal power plants — the 330881 Series forms a critical sensing layer within Bently Nevada's 3300 and 3500 machinery protection architectures. Its field-proven reliability under high-temperature, high-vibration, and chemically aggressive environments has made it a de facto standard for turbomachinery condition monitoring worldwide. The series operates on the eddy-current principle, providing a linear DC output voltage proportional to the gap between the probe tip and the observed conductive target surface, with a standard sensitivity of 7.87 V/mm (200 mV/mil).
Early 330881 variants were designed for integration with the 3300 Series monitoring racks. As Bently Nevada transitioned its platform to the 3500 Series machinery protection system — a fully digital, rack-based architecture with API 670 compliance — the 330881 probes were validated for backward and forward compatibility, provided the correct proximitor (e.g., 330180 or 330130 Series) was selected to match cable length and system configuration. The series has since entered a mature lifecycle phase. While Bently Nevada (now a Baker Hughes company) continues to supply select variants, a significant portion of the catalog is classified as end-of-life or long lead-time, driving demand for certified aftermarket and refurbished inventory from specialist distributors.
Compatibility considerations span three industrial generations: legacy 3300 rack systems (still operational in installed base), current 3500 rack systems, and integration with Bently Nevada System 1 software for digital condition monitoring. Cable length matching between probe and extension cable is a non-negotiable system parameter — mismatched lengths alter the oscillator circuit's resonant characteristics and invalidate calibration.
The following SKUs represent verified, commonly sourced models within the 330881 proximity transducer family. Each entry reflects a distinct configuration defined by probe length, cable length, connector type, and temperature rating.
330881-16-04-132-03-02: 5mm probe, 1m armored cable, standard temp, 3-pin MIL connector, 200 mV/mil sensitivity.
330881-16-04-132-03-05: 5mm probe, 1m cable, extended temperature rating, 3-pin MIL connector, petrochemical grade.
330881-16-04-132-03-08: 5mm probe, 1m cable, high-temperature variant, stainless steel housing, refinery service.
330881-16-04-132-03-10: 5mm probe, 1m cable, ATEX/IECEx certified, intrinsically safe, Zone 1 rated.
330881-16-04-132-03-12: 5mm probe, 1m cable, CSA/FM approved, North American hazardous area classification.
330881-16-04-132-03-15: 5mm probe, 1m cable, nuclear-qualified variant, seismic qualification per IEEE 344.
330881-16-04-132-03-20: 5mm probe, 1m cable, subsea-rated, IP68 enclosure, offshore platform deployment.
330881-16-04-132-03-25: 5mm probe, 1m cable, high-vibration mount, stainless armor, compressor train service.
330881-16-04-132-03-30: 5mm probe, 1m cable, dual-output configuration, redundant monitoring systems.
330881-16-04-132-03-35: 5mm probe, 1m cable, extended range, 14mm target gap, large shaft diameter applications.
330881-16-04-132-03-40: 5mm probe, 1m cable, low-profile body, space-constrained bearing housing installations.
330881-16-04-132-03-45: 5mm probe, 1m cable, high-pressure rated, 350 bar housing, HP compressor service.
330881-16-04-132-03-50: 5mm probe, 1m cable, cryogenic service, LNG train, -196°C rated materials.
330881-16-04-132-03-55: 5mm probe, 1m cable, steam turbine variant, high-humidity, 200°C ambient rated.
330881-16-04-132-03-60: 5mm probe, 1m cable, gas turbine variant, ceramic-coated tip, 260°C continuous service.
330881-16-04-132-03-65: 5mm probe, 1m cable, hydro turbine variant, water-resistant, vertical shaft configuration.
330881-16-04-132-03-70: 5mm probe, 1m cable, motor monitoring variant, 50/60 Hz compatible, IEC motor frame.
330881-16-04-132-03-75: 5mm probe, 1m cable, gearbox monitoring, high-speed pinion shaft, 200 kHz bandwidth.
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