Product Overview

The 330780-50-CN is a high-precision signal conditioning module belonging to the Bently Nevada 3300 XL 11 mm Proximity Transducer System. This Proximitor sensor is specifically engineered to provide an extended linear measurement range, making it the primary choice for monitoring axial thrust position and radial vibration on large-scale rotating machinery. By converting the eddy current signal from a non-contacting probe into a linear voltage output, it facilitates the early detection of mechanical faults. This specific model is factory-calibrated for a 5.0-meter total system length, offering high-fidelity signal conversion for critical assets where standard 8 mm sensors lack the necessary measurement envelope.

Technical Performance and Electrical Integrity

The 330780-50-CN is designed to deliver consistent diagnostic data within Turbine Supervisory Instrumentation (TSI) frameworks:

• Extended Linear Range: Features a 4.0 mm (160 mil) linear measurement window, nearly doubling the capacity of standard proximity systems.

• Scale Factor: Provides a nominal Average Scale Factor (ASF) of 3.94 V/mm (100 mV/mil).

• System Calibration: Configured for a 5.0-meter (16.4 ft) total loop length (50 option).

• Power Supply Requirements: Operates efficiently between -17.5 Vdc and -26 Vdc (barrier-free) or -23 Vdc to -26 Vdc (with barriers).

• Signal Stability: Maintains output accuracy within 2 mV per volt of input fluctuation, ensuring reliable readings despite power supply noise.

• Environmental Tolerance: Ruggedized for industrial climates, supporting an operational temperature range of -35°C to +85°C.

Engineering Design and Field Integration

Built for the rigors of power generation and heavy manufacturing, the 330780-50-CN incorporates several structural innovations:

• High-Density Mounting: The slim-profile housing is designed for efficient 35 mm DIN-rail mounting or traditional bulkhead installation, maximizing cabinet space.

• SpringLoc Terminal Strips: Features tool-free, vibration-resistant wiring terminals that simplify field connections and prevent signal loss due to mechanical loosening.

• Electrical Isolation: The integrated mounting base provides inherent isolation from the rail or panel, eliminating the need for separate isolator plates and reducing installation complexity.

• Advanced Shielding: Engineered with superior RFI/EMI immunity, meeting European CE standards without the requirement for specialized shielded conduits.

• Regional Compliance: The CN suffix indicates specific regional certification and compliance, ensuring the unit meets local regulatory standards for industrial monitoring equipment.

Primary Industrial Applications

As a critical component for protecting high-capital rotating assets, the 11 mm Proximitor is utilized for:

• Large Steam and Gas Turbines: Monitoring axial displacement where significant thermal expansion or rotor movement is expected.

• Hydroelectric Units: Tracking radial shaft motion and centerline position on large-diameter vertical or horizontal shafts.

• Centrifugal Pumps and Compressors: Early identification of rotor imbalance, misalignment, and bearing degradation.

• Machinery Protection Systems: Direct integration with Bently Nevada 3500 series racks for real-time asset analytics and automated protection trips.