Model: 330881-16-00-385-06-02
Product Overview
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Datasheet Preview
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Commercial Path
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Technical Dossier
The Bently Nevada 330881 Series is a family of proximity transducers engineered for continuous vibration and position monitoring in rotating machinery. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, offshore platforms, and LNG processing facilities — the 330881 series operates as a core sensing element within Bently Nevada's 3300 XL and legacy 3300 monitoring systems. These transducers conform to API 670 machinery protection standards and are designed for direct integration with Proximitor/Seismics and full-rack monitoring assemblies. The series covers both metric and imperial cable configurations, enabling deployment in both European and North American plant environments.
The 330881 series descends from Bently Nevada's original 7200 and 3300 transducer families, which established the eddy-current proximity sensing standard in industrial turbomachinery monitoring during the 1970s and 1980s. The 330881 generation introduced standardized metric cable assemblies, improved EMI shielding, and tighter gap voltage linearity tolerances (typically –12 VDC nominal at 1.0 mm gap). As the 3300 XL platform matured through the 1990s and 2000s, the 330881 series was refined to support longer cable extensions via the 330130 and 330180 extension cable families, maintaining system accuracy over distances up to 9 meters. With the introduction of the System 1 and Orbit 60 platforms, Bently Nevada transitioned newer installations toward the 330900 and 330780 series; however, the 330881 remains the dominant installed base in brownfield facilities where full system replacement is not economically viable. Compatibility with legacy proximitor drivers (3300 XL 8mm, 3300 XL 11mm) ensures that 330881 transducers continue to serve as long-term maintenance spares across facilities with 20–40 year operational horizons.
The following SKUs represent verified, commonly stocked configurations within the 330881 proximity transducer series. Each unit is an 8mm eddy-current transducer with metric cable assembly unless otherwise noted.
The 330881 proximity transducer operates as a precision analog sensing element; its performance is directly dependent on the integrity of the coil winding, cable shielding continuity, and tip geometry. DriveKNMS applies a multi-stage inspection protocol to all 330881 units prior to dispatch. Coil impedance is measured at 100 Hz and 1 kHz to verify winding integrity and detect internal shorts or open circuits. Gap voltage linearity is tested across the full measurement range (0.25 mm to 2.54 mm) using a calibrated target plate of AISI 4140 steel, confirming output conformance to the standard –200 mV/mil (–7.87 V/mm) sensitivity specification. Cable shield continuity and insulation resistance (IR) are verified at 500 VDC to detect moisture ingress or jacket damage. Connector pin integrity and thread condition on the transducer body are inspected under magnification. All test data is recorded and supplied with each unit as a calibration certificate. Units failing any parameter are quarantined and not released for sale.
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