Product Overview

The Bently Nevada 330850-50-05 is a high-precision signal conditioner belonging to the 3300 XL 25 mm Proximity Transducer System. Unlike standard 8 mm sensors, this 25 mm proximitor is engineered for "Extended Range" applications, offering a much larger linear measurement window. It functions as the electronic core of an eddy current measurement chain, providing the necessary excitation for the probe and converting the resulting impedance changes into a stable, linear voltage output. This system is indispensable for monitoring massive rotating assets where significant thermal expansion or large shaft displacements occur, ensuring that critical safety data remains accurate even during extreme mechanical shifts.

Hardware Parameters and Key Technical Characteristics

The 330850-50-05 is designed to maintain high linearity and temperature stability, fulfilling the requirements of API 670 for machinery protection systems.

• Model Number 330850-50-05

• Transducer Compatibility Calibrated specifically for 3300 XL 25 mm Proximity Probes

• Total System Length 5.0 Meters (Option -50)

• Mounting Option DIN rail and bulkhead mounting hardware included (Option -05)

• Linear Range 12.7 mm (500 mils), starting at approximately 0.63 mm (25 mils) from the probe face

• Scale Factor 0.787 V/mm (20 mV/mil)

• Frequency Response 0 Hz (DC) to 2.5 kHz

• Input Voltage -17.5 Vdc to -26 Vdc

• Output Signal -1.0 Vdc to -17 Vdc (Gap dependent)

• Environmental Protection Technopolymer housing provides resistance to moisture and chemical contaminants

Industrial Applications and Operational Use Cases

Due to its extended measurement range, the 330850-50-05 is the primary choice for monitoring large-scale Turbine Supervisory Instrumentation (TSI) parameters.

• Differential Expansion (DE) Measuring the relative growth between a steam turbine’s rotor and its casing during thermal cycles to prevent internal contact.

• Ramp Differential Expansion Tracking shaft movement in specialized turbine designs where standard proximity sensors lack the necessary range.

• Large-Scale Hydroelectric Generators Monitoring shaft vibration and displacement in hydro turbines where large mechanical clearances are present.

• Thermal Growth Analysis Quantifying the physical expansion of machine housings and supports in high-temperature process environments.

• Structural Displacement Tracking the movement of large industrial components in refineries and power plants where sub-millimeter precision is required over a centimeter-scale range.

The 330850-50-05 integrates seamlessly with Bently Nevada 3500 series racks, allowing for advanced diagnostic trending and automated machinery protection logic to safeguard high-value industrial infrastructure.