Product Overview

The 330878-50-00 is a high-precision signal conditioning unit belonging to the Bently Nevada 3300 XL Narrow Side View (NSv) Transducer System. This Proximitor sensor is specifically engineered for critical machinery applications where standard 8 mm or 5 mm proximity systems cannot be utilized due to restricted internal clearances. The NSv system is uniquely designed to operate in tight counterbores and areas with limited "side-view" clearance, as it is immune to the magnetic interference from surrounding metal that often distorts signals in standard eddy-current sensors. This model is factory-calibrated for a 5.0-meter total system length, providing a linear voltage output proportional to the gap between the probe tip and the target material.

Technical Performance and Signal Integrity

The 330878-50-00 facilitates advanced diagnostic data for Turbine Supervisory Instrumentation (TSI) applications:

• Signal Output: -4 to -20 Vdc linear output, facilitating direct integration with Bently Nevada 3500 series racks or PLC/DCS systems.

• Average Scale Factor (ASF): 7.87 V/mm (200 mV/mil), offering high sensitivity for detection of minute vibration levels.

• System Calibration: Fixed for 5.0-meter system length (50 option), requiring matching 5m probes and extension cables for verified accuracy.

• Linear Range: 1.5 mm (60 mils), delivering consistent measurement across a wide operating gap.

• Small Target Accuracy: Optimized for monitoring radial vibration on shafts as small as 51 mm (2 inches) or axial position on targets down to 15 mm (0.6 inches).

Engineering for Challenging Environments

Constructed to withstand the rigors of heavy industrial sectors, the 330878-50-00 features:

• Electromagnetic Compatibility: Built-in RFI/EMI immunity that meets European CE standards, ensuring stable measurement signals without the need for specialized shielded conduits in high-noise environments.

• Mounting Versatility: The compact housing supports both high-density DIN-rail mounting and traditional bulkhead installation, maximizing cabinet space efficiency.

• Field Connection Stability: Utilizes SpringLoc terminal strips to provide tool-free, vibration-resistant wiring connections, significantly reducing the risk of signal loss due to mechanical loosening.

• Legacy Compatibility: Serves as a modern, high-performance replacement for older 3300 RAM, 3000-series, and 7000-series transducer systems, simplifying facility modernization.

Primary Industrial Applications

The 3300 XL NSv system is a vital component for protecting high-speed rotating assets, including:

• Centrifugal Air Compressors: Reliable vibration monitoring in the restricted internal housings of air and process gas compressors.

• Refrigeration Units: Monitoring thrust position and radial motion in compact chilling equipment.

• Fluid-Film Bearing Machinery: Essential for tracking shaft dynamic motion, misalignment, and bearing wear in medium-sized rotating assets.

• Phase Reference Generation: Providing the clean, stable pulse signals necessary for Keyphasor measurements and advanced rotor dynamic diagnostics.