Description

The Bently Nevada 330878-90-00 is a 3300 XL 50 mm Proximitor Sensor designed for high-precision, non-contact position measurement in industrial rotating machinery. As a core component of the 3300 XL 50 mm Proximity Transducer System, it is specifically engineered to measure differential expansion (DE) or rotor expansion (RX) in large steam turbine generators. This system monitors the critical difference in thermal growth rates between the turbine rotor and the machine stator casing.

Features

• System Configuration: Includes a 50 mm probe, extension cable, and the 3300 XL 50 mm Proximitor Sensor.
• Extended Linear Range: Provides a maximum linear range of 27.9 mm (1100 mils), the longest in the Bently Nevada eddy current transducer line.
• Advanced RFI/EMI Immunity: Designed for high-frequency radio signal immunity, meeting European CE mark requirements without special mounting considerations.
• Installation Versatility: Features a thin design suitable for high-density DIN-rail or traditional panel mount configurations.
• Robust Connectivity: Equipped with SpringLoc terminal strips for tool-free, reliable field wiring and gold-plated ClickLoc connectors.

Applications

• Steam & Gas Turbines: Monitoring thermal growth and rotor vibration.
• Centrifugal & Process Compressors: Shaft stability monitoring in high-pressure oil, gas, and chemical environments.
• Large Industrial Pumps: Detecting bearing friction and misalignment in boiler feed and water pumps.
• Generators & Alternators: Protection against electrical faults that cause rotor imbalance.
• Large Fans & Blowers: Monitoring cooling tower and induced-draft fan performance.

Technical Specifications

Installation Guidelines

• System Length: The 330878-90-00 requires a precise 9.0-meter total electrical loop length. The combined physical length of the probe and extension cable must match this requirement to maintain calibration accuracy.
• Connector Care: Keep disposable connector protectors on the gold-plated ClickLoc connectors during cable routing to prevent contamination.
• Mounting: The unit supports both DIN-rail and panel mounting. Ensure the mounting surface is clean and secure.
• Handling: As a precision electronic sensor, handle with care to avoid damage to the probe tip or connector pins. Always power down the system before disconnecting or connecting the sensor.

FAQs

What is the 330878-90-00?

The Bently Nevada 330878-90-00 is a 3300 XL 50 mm Proximitor Sensor used for non-contact vibration and position measurement in industrial machinery.

What is the 330878-90-00 designed to measure?

It is specifically engineered for measuring differential expansion (DE) or rotor expansion (RX) in large steam turbine generators.

Does this sensor require special shielded conduit?

No, the 3300 XL Proximitor Sensor has high RFI/EMI immunity, satisfying European CE mark approvals without requiring special shielding or metallic housings.

Is the 330878-90-00 compatible with older systems?

Yes, it is designed for both high-density DIN-rail installation and traditional panel mounts, sharing the same 4-hole mounting footprint as older designs.