Bently Nevada 330878-90-00 3300 XL Proximitor Sensor

Bently Nevada 330878-90-00 3300 XL Proximitor Sensor

The Bently Nevada 330878-90-00, also cataloged as the 3300 XL 50 mm Proximitor Sensor, operates as a dedicated hardware component for large-range displacement monitoring within TSI (Turbomachinery Supervisory Instrumentation) systems.

Suffix Breakdown & Model Matrix

Hardware Specifications

Mechanical Monitoring & TSI Integration

The 3300 XL 50 mm system utilizes an enlarged coil diameter to provide an extended linear range of 27.9 mm (1100 mils), which is essential for accurate eddy-current probe scaling in high-growth machinery applications. During integration, gap voltage validation is performed to ensure the transducer operates within its linear measurement band for rotor dynamics and differential expansion tracking. The sensor architecture incorporates cross-talk suppression to maintain signal fidelity when monitoring the thermal growth rates of large steam turbine generators, providing reliable output data for stator-rotor gap analysis.

Frequently Asked Questions

Q: Is the 3300 XL 50 mm system suitable for standard radial vibration monitoring?

A: No. This system is specifically engineered for long-range applications such as differential expansion or rotor expansion measurements. Its large tip diameter is not optimized for the high-frequency vibration characteristics typical of fluid-film bearings.

Q: Does this Proximitor require specific system length matching?

A: Yes. The Proximitor sensor, extension cable, and 50 mm probe are calibrated as a matched system. Ensure that the total system length is consistent with the specified configuration to prevent measurement nonlinearity.

Field Installation Guidelines

• Mounting: Install the Proximitor sensor in a dry, accessible area within the instrument rack. Secure the unit using the provided mounting hardware to prevent movement.
• Wiring: Connect the -24 VDC power supply carefully, observing the +/- 10% tolerance to avoid sensor damage or signal drift. Utilize shielded cables to maintain the integrity of the 10 kHz dynamic signal.
• Gap Adjustment: Given the extended linear range, use a precision calibration tool to set the physical gap. Ensure the rotor is at a known position relative to the probe to establish a valid baseline during commissioning.
• Environment: Ensure the installation area adheres to the specified operating temperature range (-40 deg C to +120 deg C) to prevent thermal-induced output errors.