Bently Nevada 330930-045-03-CN 3300 NSv Extension Cable

Description

Designed for high-reliability transmission of displacement signals in Turbine Supervisory Instrumentation (TSI) architectures, the Bently Nevada 330930-045-03-CN serves as the vital connection link between a 3300 NSv proximity probe and its matching proximitor sensor. This premium-grade coaxial cable is engineered specifically for applications with restricted installation clearances or small shaft diameters where standard proximity systems are incompatible. Constructed with a 75 ohm coaxial FEP insulation, the cable provides consistent electrical performance, shielding critical machinery health data from electromagnetic interference and harsh industrial environments.

This specific configuration features a 4.5-meter cable length, an unarmored outer design with integrated connector protectors to shield junctions from fluid ingress, and specialized country-specific agency certifications. By maintaining strict impedance matching across its entire length, it ensures maximum linearity and accuracy in dynamic vibration and position measurements.

Key Features

• Fluoroethylene Propylene (FEP) Insulation: Offers exceptional thermal stability and robust resistance to corrosive industrial solvents, chemicals, and moisture.
• Connector Protectors (Option 03): Provides localized environmental sealing at the probe-to-cable connection point, eliminating the risk of grounding faults or signal degradation.
• Matched Impedance Performance: Maintained at 75 ohms to eliminate signal reflection and ensure precise signal transmission back to the monitoring rack.
• Wide Thermal Envelope: Rated for operation across extreme temperature swings common in rotating machinery casings.

Target Applications

• Radial vibration and axial position measurements on high-speed fluid-film bearing machines.
• Restricted-space installations including small-diameter industrial pumps, fans, and compressors.
• Steam and gas turbine supervisory instrumentation systems requiring localized CN approval compliance.
• Aeroderivative gas turbines and auxiliary power unit monitoring.

Ordering Information

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

It is critical to note that the 3300 NSv series is electrically and physically distinct from the standard 3300 XL 5mm or 8mm series. Extension cables designed for the 3300 XL system cannot be swapped with the 3300 NSv cables due to differences in nominal probe target sizes and electrical tuning parameters. Ensure that you are pairing this 4.5m extension cable with a 0.5m proximity probe to maintain the mandatory 5.0m overall system length calibrated for your specific proximitor model.

Application Pitfalls & Engineering Notes

The -03 option designates an unarmored configuration. While FEP insulation offers superior chemical resistance to machine oils and coolants, this cable is susceptible to crushing or shearing if routed directly through high-traffic machine areas without conduit protection. In environments with heavy mechanical risk or dynamic physical wear, run this cable inside a dedicated protective flexible conduit to prevent signal interruptions or physical conductor breaks.

Commissioning & Wiring Tips

When joining the extension cable to the proximity probe, verify that the connector protectors are fully seated and free of dirt, oil, or condensation. A common commissioning error is allowing moisture into the coaxial junction, which degrades isolation resistance to the machine casing, causing ground loops and spurious vibration spikes. Use a high-quality connector insulation kit or silicone self-fusing tape to lock the connector protectors in place once connection torque is reached.

Installation Guidelines