Bently Nevada 330854-040-24-CN 3300 XL 25 mm Extension Cable

Bently Nevada 330854-040-24-CN 3300 XL 25 mm Extension Cable

The Bently Nevada 330854-040-24-CN serves as the primary 3300 XL 25 mm Extension Cable utilized to execute absolute differential expansion data routing across 3300 XL 25 mm Transducer System platforms. This factory-calibrated coaxial assembly establishes physical electrical continuity between a 25 mm eddy-current proximity probe and a matching 3300 XL Proximitor Sensor, maintaining transmission integrity within steam turbine casing environments.

Hardware Specifications

Machinery Monitoring & Eddy-Current Probe Scaling

The Bently Nevada 330854-040-24-CN features a precise 50 ohm characteristic output resistance, critical for preserving the factory calibration scale factor of 0.787 V/mm (20 mV/mil). This precise impedance profile suppresses high-frequency reflections and signal cross-talk suppression errors across the extended 12.7 mm linear measurement range. Designed as a FluidLoc cable variant, the physical construction blocks moisture migration along the interior core lines, preventing fluid leaks from the pressurized interior of medium-to-large steam turbine casings. This stability ensures that the baseline gap voltage validation remains stable, preventing drift during high-amplitude thermal fluctuations when tracking differential growth between the turbine rotor and machine stator.

Frequently Asked Questions

Q: Can the 330854-040-24-CN extension cable be combined with standard 5 mm or 8 mm proximity probes?

A: No. The physical electrical parameters, electrical length, and tuning properties of this cable are matched explicitly to the 3300 XL 25 mm proximity probe and Proximitor sensor network. Interchanging with smaller proximity probe types will disrupt the linear scaling entirely.

Q: What is the purpose of the High Temperature FluidLoc option on this cable?

A: The FluidLoc structural design integrates an interior barrier substance that blocks the travel of oil or process fluids through the inside of the cable assembly, ensuring machine room fluids cannot migrate past containment boundaries while enduring continuous operational heat exposure.

Field Installation Guidelines

1. Connector Protection: Ensure that the coaxial connectors remain entirely dry and free from contaminants during routing. Apply a layer of self-vulcanizing tape or silicon rubber boots over connections located inside oil mist zones.
2. Minimum Bend Radius: Do not exceed a minimal bend radius of 25.4 mm (1.0 inch) during structural physical routing to prevent kinks or damage to the internal 50 ohm conductors.
3. Isolate Ground Paths: Do not allow the exterior coaxial connectors of the cable assembly to contact metallic conduit or machine casing elements. An unisolated junction can initiate common-mode ground loop currents that degrade signal tracking accuracy.
4. Physical Support Anchoring: Secure the physical cable length at intervals of less than 1.0 meter inside structural conduit channels to limit whipping or friction wear caused by structural machinery operational harmonics.