Bently Nevada 330930-065-01-01 3300 XL NSv Proximity Extension Cable (6.5m)

Field Engineering Overview

The Bently Nevada 330930-065-01-01 is a high-frequency, 75-ohm impedance-matched 3300 XL NSv Extension Cable engineered specifically for confined machinery envelopes where standard 5mm or 8mm proximity probes physically cannot fit. The NSv (Narrow Side-view) sub-series is critical for fluid-film bearing systems on machines like high-speed centrifugal refrigeration compressors, turbo-expanders, and small-diameter pump shafts (less than 51 mm or 2 in) that exhibit strict cross-talk and sideview restrictions.

Unlike shorter standard runs, this specific variant delivers an extended 6.5-meter (21.3 feet) physical line length. It is built using the -01 unarmored configuration, featuring a highly flexible, low-friction fluorinated ethylene propylene (FEP) dielectric jacket without the heavy outer stainless steel interlocking armor. This unarmored design is critical for complex field marshalling where the cable must be pulled through tight, multi-bend conduit networks. It is certified under the -01 standard agency option for non-hazardous general plant zones or installations utilizing existing flameproof enclosures.

Mechanical Profile & Exact Weight Formulas

In large-scale industrial retrofits, relying on arbitrary box dimensions or generic "length x width x height" specifications leads to critical errors in cable tray loading and strain-relief math. For advanced engineering documentation, the accurate physical metrics of this 6.5-meter unarmored FEP cable assembly are defined below:

• Linear Mass Density of Cable: 45 grams per meter (0.50 oz/foot)
• Net Cable Core Mass: 45 g/m x 6.5 m = 292.5 grams (10.32 oz)
• ClickLoc Terminal Hardware Mass: Approx. 7.5 grams (0.26 oz) per calibrated connector pair
• Total Net Assembly Weight: 300.0 grams (10.58 oz) absolute net hardware weight
• Maximum Rigid Clearance Profile: The absolute outer diameter of the integrated male/female gold-plated ClickLoc coaxial connector is 7.2 mm (0.285 in), which dictates the minimum clearance required for conduit pass-through pulling.
• Minimum Field Bend Radius: 25.4 mm (1.0 in). Bending the FEP jacket beyond this boundary permanently alters the internal coaxial capacitance, distorting the Proximitor’s RF resonance.

Target Applications

• Extended-run radial vibration sensing inside deep-well or multi-stage centrifugal gas compressors with distant junction boxes.
• Axial thrust position tracking loops where the 3300 NSv probe must route out through deep internal structural machine bulkheads.
• Speed, zero-speed, and Keyphasor phase reference signal cross-routing across complex balance-of-plant skids.

Functional Verification Matrix (Option Suffixes)

Technical Specifications

Strategic Field Installation Guidelines

• The 7.0-Meter Total Loop Rule: This 6.5-meter extension cable must only be matched with a 0.5-meter physical length 3300 NSv proximity probe to build an exact 7.0-meter total system loop. Pairing a 6.5m cable with a 1.0m probe, or hooking it up to a Proximitor tuned for a 5.0m system, shifts the circuit's resonant frequency, rendering the 200 mV/mil average scale factor (ASF) completely invalid.
• Vertical Drop Tension Relief: Because this unarmored cable weights 292.5 grams without armor support, vertical drops over 4 meters inside smooth conduits require mid-point intermediate clamping or loop drops to prevent gravity-induced structural stretching of the internal copper core over years of high-temperature exposure.
• Isolation from Cable Trays: Ensure the coaxial ClickLoc metal couplings are insulated from contact with aluminum or steel instrumentation trays. Use factory connector protectors or high-grade self-fusing silicone wraps to maintain absolute isolation from structural earth loops.