Bently Nevada 330878-50-00 3300 XL 50 mm Proximitor Sensor

The 330878-50-00 is a 3300 XL 50 mm Proximitor Sensor designed as a fundamental signal processing component of eddy current proximity transducer systems. This device accepts a noncontacting input from one 3300 XL 50 mm proximity probe and extension cable, converting the relative distance between the probe tip and target into a proportional voltage output. Engineered specifically for long-range displacement monitoring, the sensor is optimized for key industrial machinery measurements where standard proximity probes lack the required measurement range. It provides seamless system interchangeability, delivering an output scaling identical to older legacy systems to facilitate straightforward retrofitting and modernizing without altering monitor configurations.

Features

• High-Density Deployment: Features a thin physical profile suitable for space-saving installations across traditional and modern control cabinets.
• Robust Toolless Terminals: Equipped with SpringLoc terminal strips that accept field wiring between 0.2 and 1.5 mm² (16 to 24 AWG) without requiring specialized installation tools.
• Advanced RFI/EMI Immunity: Protects signal transmission from nearby high-frequency radio frequencies and complies with European CE mark criteria without specialized mounting considerations.
• Pre-Calibrated Output: Standard default calibration is fine-tuned to AISI 4140 steel targets, outputting a precise average scale factor of 394 mV/mm (10 mV/mil).

Applications

• Differential expansion (DE) monitoring on large steam turbine generators.
• Rotor expansion (RX) tracking relative to the machine stator or casing.
• Complementary input configuration setups to effectively double the measurable displacement range.
• Large-scale axial displacement and thermal growth monitoring on high-power industrial turbomachinery.

Ordering Information

Ordering Option Breakdown for 330878-50-00

Technical Specifications

Installation Guidelines

• Panel Mounting: Secure the sensor to a clean, flat panel surface utilizing appropriate mounting hardware to guarantee rigid fastening and dependable chassis grounding.
• System Calibration Matches: Confirm that the collective mechanical lengths of the proximity probe and extension cable accurately equate to the designated 5.0-meter system length of the sensor.
• Field Wiring Routing: Employ three-conductor shielded triad cables for field terminal links. Keep the sensor wiring separated from high-voltage conduit lines to maintain low noise.
• Power Supply Integrity: Supply steady DC voltage between -17.5 Vdc and -26 Vdc. Operational voltage more positive than -23.5 Vdc must be avoided as it can cause a compression of the system's total linear range.