Bently Nevada 330877-080-36-05 8m Triaxial Cable

Product Overview

The 330877-080-36-05 is a premium, high-integrity 3300 XL 50 mm Proximity Extension Cable manufactured by Bently Nevada (a Baker Hughes business). This highly specialized component is engineered for demanding machinery protection systems, where it continuously transmits raw eddy-current signals from a 50 mm proximity probe to a remote Proximitor sensor. Unlike standard consumer components, this industrial cable features option **05 (Multiple Approvals)**, making it fully certified for installation within hazardous, explosive, and intrinsically safe areas globally. Comprising an 8.0-meter unarmored FluidLoc triaxial line, it offers long-distance routing flexibility on critical asset skids such as gas turbines, large compressors, and heavy hydro-turbines. Maintained in original factory packing with a full 12-month factory warranty, this brand-new unit has a net hardware weight of approximately 1.35 lbs (approx. 0.61 kg).

The visual highlights the unarmored, lightweight design of the core FluidLoc configuration. Its distinct light-blue outer jacket is highly visible inside industrial wiring conduits, while the integrated protective caps shield the precision miniature coaxial interfaces from field debris and contamination prior to final loop installation.

Core Technical Advantages

• Global Hazardous Area Certifications (Option 05): Specifically designed and validated to meet strict international standards (including ATEX, IECEx, and North American CSA/FM rules). This ensures the cable can safely operate in Class I, Division 1/Zone 0 environments when connected via an approved intrinsic safety barrier.
• FluidLoc Ingress Prevention: Features an engineered internal wicking barrier along the triaxial core. If the outer jacket suffers a cross-sectional cut in the field, this barrier stops lubricating oil, moisture, or process gases from migrating inside the cable sheath into clean instrument enclosures.
• Advanced Noise-Rejecting Architecture: Formed with a 75 Ω triaxial layout insulated with top-tier Perfluoroalkoxyethylene (PFA). This premium multi-shielded design provides extreme immunity to electromagnetic interference (EMI) and radio frequency interference (RFI) generated by nearby heavy-duty machinery.
• Broad Temperature Resilience: Designed to maintain constant electrical properties across an extreme operating spectrum of -51°C to +200°C (-31°F to +392°F), resisting degradation from bitter sub-zero exposures or intense radiant machinery heat.

Technical Specifications

Model Number Breakdown

The catalog structure for 330877-080-36-05 translates directly to the following hardware matrix criteria:

• 330877: Base model designation for the heavy-duty 3300 XL 50 mm Extension Cable lineup.
• 080: Designates a physical cable extension length of exactly 8.0 meters (26.2 feet).
• 36: Specifies the proprietary, unarmored FluidLoc triaxial design, maximizing chemical resistance while maintaining a flexible physical footprint.
• 05: Implements the **Multiple Approvals** option block, providing full hazardous zone explosion protection compliance (Intrinsically Safe and Non-Incendive ratings).

Field Installation & Loop Calibration Guidelines

• Total Matched Tuning Rule: To maintain strict system calibration linearity, the cumulative electrical length of the extension cable plus the proximity probe must perfectly match the total system length configured on your Proximitor Sensor. Because this extension cable is precisely 8.0 meters long, it must be paired with a 1.0-meter proximity probe to achieve a standard 9.0-meter loop setup. Running a mismatched combination will alter the circuit's base impedance, rendering your vibration and thrust displacement measurements highly inaccurate.
• Hazardous Location Verification: Because this model is configured with the option 05 approval block, ensure that all installation parameters align perfectly with the factory-supplied intrinsic safety control drawings. Maintain clean, segregated routing away from non-intrinsically safe cabling inside junction boxes, and verify that ground-loop isolation is verified before powering the monitoring system.
• Connector Protection & Handling: When connecting the high-precision miniature coaxial interfaces, prevent twisting or scraping the central conductor pin. To prevent loosening caused by heavy machinery vibration, ensure the connectors are fully seated. Bently Nevada strongly recommends wrapping the mated connection in self-fusing silicone tape or housing it in an external connector protector sleeve to shield the unarmored connection point from oil mist ingress.

Technical FAQs

Q1: What separates the option "05" approval code from the standard option "00" cable?
A1: Physically, the cables look and perform identically under normal conditions. However, the option 05 variant undergoes strict quality control and regulatory certification audits to verify its safe electrical profile in explosive environments. Option 00 lacks these certificates and cannot be used legally in hazardous plant areas that mandate explosion-proof or intrinsically safe equipment.

Q2: Why are the DC resistance values higher on this model than on shorter cables?
A2: Electrical resistance is directly proportional to line length. This 8.0-meter assembly exhibits a center conductor resistance of 2.0 ± 0.5 Ω, which is exactly double that of a 4.0-meter cable (1.0 ± 0.25 Ω). Field technicians performing loop diagnostic checks must cross-reference these values to prevent false failure conclusions.

Q3: Does the unarmored FluidLoc jacket offer enough physical defense without a steel conduit?
A3: The PFA jacket provides superb defense against chemical splash, cutting, and tearing. However, since it is an unarmored cable weighing just 1.35 lbs, it should always be routed through dedicated conduit pipes or cable trays if it passes through open areas exposed to flying metal debris, heavy tool drops, or maintenance foot traffic.