Model: 330854-040-24-CN
Product Overview
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Datasheet Preview
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Commercial Path
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Technical Dossier
The Bently Nevada 330854 series comprises armored extension cables engineered for use within the 3300 Series proximity transducer system — one of the most widely deployed vibration and position monitoring platforms in global heavy industry. These cables serve as the signal-transmission link between the proximity probe (330100/330130/330180 series) and the proximitor sensor (3300 XL 8mm, 11mm, 25mm). Installed across petrochemical refineries, nuclear power stations, LNG terminals, offshore platforms, and rotating machinery in steel and pulp mills, the 330854 series is a critical infrastructure component with a global installed base measured in the hundreds of thousands of units. The cable's armored construction and defined characteristic impedance are mandatory for maintaining the calibrated gap voltage and scale factor required by API 670 machinery protection standards.
The 330854 extension cable series was introduced alongside the original Bently Nevada 3300 proximity transducer system in the 1980s, designed to standardize the electrical interface between field-mounted probes and rack-mounted proximitor drivers. Early versions were specified in imperial lengths (feet) and used a single-ended coaxial construction with a defined 100 Ω characteristic impedance. As the 3300 XL platform matured through the 1990s and 2000s, the cable specification was refined to accommodate higher-frequency eddy-current driver circuits and tighter EMI shielding requirements in nuclear-classified environments.
The part number structure encodes critical application parameters: the first numeric block (330854) identifies the series; the second block specifies length in feet (e.g., 040 = 40 ft, 025 = 25 ft); the third block identifies the connector termination style (24 = standard); and the suffix (CN, TN, etc.) designates the cable jacket and armor material. CN denotes a standard conduit-ready armored construction. TN variants use a Teflon-jacketed armor for high-temperature or chemically aggressive environments.
The following SKUs represent the primary catalog of the 330854 extension cable series, organized by cable length and jacket specification. All units are 100 Ω characteristic impedance, armored coaxial construction, compatible with 3300 XL 8mm, 11mm, and 25mm proximitor sensors.
330854-025-24-CN: 25 ft armored extension cable, CN jacket, standard connectors.
330854-030-24-CN: 30 ft armored extension cable, CN jacket, standard connectors.
330854-035-24-CN: 35 ft armored extension cable, CN jacket, standard connectors.
330854-040-24-CN: 40 ft armored extension cable, CN jacket, standard connectors — current SKU.
330854-050-24-CN: 50 ft armored extension cable, CN jacket, standard connectors.
330854-060-24-CN: 60 ft armored extension cable, CN jacket, standard connectors.
330854-075-24-CN: 75 ft armored extension cable, CN jacket, standard connectors.
330854-100-24-CN: 100 ft armored extension cable, CN jacket, standard connectors.
330854-025-24-TN: 25 ft Teflon-jacketed armored cable, high-temperature service.
330854-040-24-TN: 40 ft Teflon-jacketed armored cable, high-temperature service.
330854-050-24-TN: 50 ft Teflon-jacketed armored cable, high-temperature service.
330854-100-24-TN: 100 ft Teflon-jacketed armored cable, high-temperature service.
330854-025-24-QA: 25 ft cable, nuclear-qualified armor, QA documentation package.
330854-040-24-QA: 40 ft cable, nuclear-qualified armor, QA documentation package.
330854-050-24-QA: 50 ft cable, nuclear-qualified armor, QA documentation package.
330854-100-24-QA: 100 ft cable, nuclear-qualified armor, full traceability documentation.
For nuclear power station clients requiring QA-documented traceability (10 CFR 50 Appendix B compliance), DriveKNMS can provide full material traceability packages, calibration certificates, and country-of-origin documentation. For petrochemical and refinery clients operating under planned turnaround schedules, we support bulk pre-order programs with staged delivery to minimize on-site storage requirements. All 330854 units shipped by DriveKNMS are inspected for connector integrity, jacket continuity, and shield termination before dispatch.
The 330854 extension cable is a passive component, but its electrical characteristics are critical to system accuracy. DriveKNMS applies the following test protocol to all 330854 units prior to shipment:
Characteristic Impedance Verification: Time-domain reflectometry (TDR) measurement to confirm 100 Ω ± 2 Ω along the full cable length. Deviations indicate damaged dielectric or connector termination faults.
DC Resistance Check: Center conductor and shield resistance measured end-to-end. Out-of-specification readings indicate broken conductors or corroded terminations.
Shield Continuity and Isolation: Shield-to-center-conductor isolation verified at 500 VDC to detect dielectric breakdown in aged cables.
Connector Inspection: Visual and dimensional inspection of both male and female connectors for thread damage, pin alignment, and O-ring condition.
Length Verification: Physical length confirmed against part number specification. Incorrect cable length directly affects the proximitor calibration gap voltage.
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