Bently Nevada 330878-91-00 3300 XL 50 mm Proximity Transducer System Proximitor Sensor

The 330878-91-00 is a 3300 XL 50 mm Proximitor Sensor designed as an essential signal processing interface for eddy current proximity transducer systems. The device accepts a noncontacting input from one 3300 XL 50 mm Proximity Probe and Extension Cable, converting the measured gap between the probe tip and a target into a proportional voltage output. Engineered specifically for long-range displacement monitoring, this sensor is optimized for measuring differential expansion (DE) or rotor expansion (RX) on fluid-filmed bearing machines such as large steam turbine generators. It features a thin layout ideal for high-density configurations and provides complete backwards signal compatibility with older legacy 7200 and 50 mm DE Integral systems by maintaining an identical output scale factor.

Features

• High-Density DIN Rail Mount: Designed with a slim enclosure layout optimized for space-efficient installation on standard 35 mm DIN rails.
• Advanced EMI/RFI Immunity: Restricts high-frequency radio signal disruptions and fulfills European CE mark criteria without specialized installation adjustments.
• Toolless Field Connections: Utilizes SpringLoc terminal strips to facilitate fast, robust field wiring installation without requiring specialized tools.
• Standard Factory Calibration: Pre-calibrated by default to an AISI 4140 steel target for plug-and-play operation in industrial environments.

Applications

• Differential expansion (DE) tracking on high-power steam turbine generators.
• Rotor expansion (RX) measurement resulting from thermal growth variations between rotors and casings.
• Large-scale axial displacement tracking on industrial rotating machines.
• Dual complementary input transducer setups designed to expand the overall measurable displacement range.

Ordering Information

Ordering Option Breakdown for 330878-91-00

Technical Specifications

Installation Guidelines

• DIN Rail Mounting: Mount the device on a 35 mm DIN rail inside a protective industrial control enclosure.
• System Length Verification: Ensure the exact physical lengths of the paired proximity probe and extension cable combined equal the 9.0-meter specified system length of the sensor.
• Field Wiring Material: Use three-conductor shielded triad cable for terminal connections to maintain optimal signal performance. Route sensor wiring separately from high-voltage cables.
• Power Supply Constraints: Maintain a clean DC power input within the -17.5 Vdc to -26 Vdc threshold. Avoid operating voltages more positive than -23.5 Vdc as this can reduce the total linear range.