Bently Nevada 330780-51-05 3300 XL 11 mm Proximity Sensor Transducer System

The Bently Nevada 330780-51-05 is a precision Proximitor sensor, a critical component of the 3300 XL 11 mm Proximity Transducer System. Designed and manufactured by Bently Nevada (now part of Baker Hughes), this system is the industry standard for non-contact vibration and displacement measurements on fluid-film bearing machines in critical applications like turbines, compressors, and pumps .

What is the Bently Nevada 330780-51-05?

The model 330780-51-05 refers to a specific 3300 XL 11 mm Proximitor sensor. It serves as the signal conditioning module that receives raw signals from the 11 mm probe and extension cable, converting them into a voltage output proportional to the target gap . This particular configuration features a 5.0 meter (16.4 feet) system length and is designed for DIN-rail mounting . The "-05" suffix indicates a Multi-Approval certification, ensuring compliance with international safety and installation standards .

Key Features and Benefits

Extended Linear Range: The 11 mm probe tip provides a longer linear measurement range (up to 4.0 mm or 160 mils) compared to standard 8 mm systems. This makes it ideal for measuring axial thrust position, differential expansion, and rod drop .

High Output Sensitivity: Delivers a standardized output of 3.94 V/mm (100 mV/mil) , ensuring consistent and accurate data for monitoring systems like the Bently Nevada 3500 series .

Advanced Connectivity: Features gold-plated brass ClickLoc™ connectors that lock securely in place to prevent loosening from vibration. The system supports complete component interchangeability without the need for benchtop calibration .

Durable Design: The rugged, slim-profile Proximitor (330780) is designed for DIN-rail mounting (as specified by the "-51" option), saving space in control panels. It also boasts improved RFI/EMI immunity, meeting CE certification requirements without special installation considerations .

Safety Certified: The 3300 XL system is qualified for safety-instrumented functions, certified for use in applications up to SIL 2 (in HFT=0) and SIL 3 (in redundant HFT=1) configurations per IEC 61508 .

Technical Specifications (System)

Probe Tip Diameter: 11 mm

Linear Range: 0.5 mm to 4.5 mm (4.0 mm total range) 

Frequency Response: 0 to 8 kHz 

Sensitivity: 3.94 V/mm ± 10% 

Power Requirement: -17.5 Vdc to -26 Vdc (without barriers) 

Applications

The 3300 XL 11 mm system is essential for protecting and monitoring critical rotating machinery, specifically in applications requiring a longer linear range :

Axial (Thrust) Position Monitoring: Crucial for measuring shaft position in turbines.

Differential Expansion: Measuring case-to-rotor expansion in steam turbines.

Reciprocating Compressors: Monitoring piston rod position or rod drop.

Speed and Phase Measurement: Providing Keyphasor® signals for tachometer and zero-speed measurements.

Summary

The Bently Nevada 330780-51-05 Proximitor is a vital upgrade or replacement part for any high-reliability machinery protection strategy. As part of the 3300 XL family, it offers superior performance, robust construction, and the interchangeability that modern maintenance teams require. Whether upgrading legacy 7200 series systems or building new monitoring installations, this transducer system delivers the data integrity needed to prevent unplanned downtime .