Bently Nevada 330877-040-36-05 3300 XL 50mm Extension Cable

Product Overview

The 330877-040-36-05 is an authentic, high-performance 3300 XL 50 mm Extension Cable engineered by Bently Nevada (a Baker Hughes business). This heavy-duty industrial component is part of the premium 3300 XL proximity transducer system, which is universally deployed to monitor critical machinery metrics such as axial thrust, fluid-film bearing vibration, and shaft position on large-scale rotating equipment. Built with a robust FluidLoc triaxial jacket, this 4.0-meter cable acts as the vital electrical link transferring high-frequency eddy-current signals from the 50 mm proximity probe to the remote Proximitor sensor module. Safely stored in its original factory packaging, this brand-new unit features a comprehensive 12-month factory warranty and features a net hardware shipping weight of approximately 0.75 lbs (approx. 0.34 kg) per unarmored assembly.

Core Technical Advantages

• Multiple Hazardous Area Approvals (Option 05): Certified with comprehensive global agency approvals (including ATEX, IECEx, and North American standards). This enables safe deployment in Zone 0, Zone 1, and Division 1 explosive atmospheres when integrated into a properly engineered intrinsically safe loop.
• FluidLoc Cable Technology: Utilizes an advanced internal block barrier design that prevents process fluids, moisture, or chemical vapors from wicking through the cable interior into the control panel if the outer jacket is punctured.
• High-Tier Triaxial Shielding: Built with a 75 Ω triaxial structure insulated with Perfluoroalkoxyethylene (PFA). This architecture guarantees exceptional cross-talk isolation and guards low-amplitude signals against severe industrial electromagnetic interference (EMI).
• Extreme Thermal Operating Resilience: Specifically rated to operate flawlessly in ambient environments spanning from -51°C up to +200°C (-31°F to +392°F), making it ideal for the extreme temperatures found inside steam turbine housings, gas compressors, and industrial pump skids.

Technical Specifications

Model Number Breakdown

The part number 330877-040-36-05 conforms to standard Bently Nevada engineering matrix definitions:

• 330877: Core product platform code for the high-precision 3300 XL 50 mm Extension Cable system.
• 040: Specifies a baseline linear length of precisely 4.0 meters of active, raw signal line.
• 36: Selects the proprietary FluidLoc Cable layout, providing high chemical resistance and fluid-wicking barriers without an external interlocking metal conduit.
• 05: Enforces **Multiple Approvals** compliance, qualifying the component for multi-regional certifications across global hazardous locations.

Installation & Loop Tuning Guide

• Total Tuning Length Balancing Rule: Crucial to system accuracy: the combined length of your extension cable and the proximity probe's integrated lead must exactly equal the total calibrated length required by your 3300 XL Proximitor Sensor (typically 5.0 meters or 9.0 meters total loop lengths). For example, pairing this 4.0-meter extension cable with a 1.0-meter probe creates a perfect 5.0-meter matched loop. Mixing lengths will alter the system's impedance and cause significant calibration drift.
• Coaxial Connector Mechanical Protection: Use care when connecting the miniature coaxial interfaces. Avoid over-tightening or twisting the center conductor pin, which can degrade signal clarity. Because the unarmored 4.0m cable has a low mass profile of just 0.75 lbs, it should be anchored along its routing path with soft clamps to avoid mechanical whipping or connector tension in highly turbulent environments. Bently Nevada strongly recommends wrapping the final connector connection in silicone self-fusing tape or installing a dedicated connector protector sleeve to shield the junction from ambient oil or grease contamination.
• Minimum Bend Radius Constraints: When routing the 4.0-meter FluidLoc cable through conduit lines or cable trays, maintain the factory-recommended minimum bend radius. Tight kinks or sharp corners can distort the internal PFA insulation geometries, changing the 75 Ω line impedance and introducing unwanted measurement ripple.

Technical FAQs

Q1: What distinguishes the "-05" approval option from the baseline "-00" option?
A1: The "-00" option represents a standard commercial part with no hazardous area certificates attached. The "-05" option designates that the cable is fully tested and marked for Multiple Approvals (such as ATEX, IECEx, and CSA), which are legally required when routing instrumentation lines directly into explosive or high-risk petrochemical environments.

Q2: Why are the DC resistance values specified so precisely down to fractions of an Ohm?
A2: Proximity systems rely on high-frequency RF signal modulation to measure physical distance. Small changes in resistance can alter the calibration curves. Technicians use the specified values ($1.0 \pm 0.25\ \Omega$ center-to-coax and $0.3 \pm 0.1\ \Omega$ coax-to-coax) during loop inspections to verify cable health and detect internal wire fractures or bad connections.

Q3: Does the unarmored version offer high structural durability given its light 0.75 lbs design?
A3: Yes. The PFA jacket is highly resilient against mechanical abrasion, slicing, and harsh machine oils. However, if your installation path is directly exposed to flying metal debris, worker foot traffic, or heavy environmental impacts, an armored variation (such as option -37 with stainless steel armor) is recommended for enhanced physical defense.