Bently Nevada 330878-91-CN 3300 XL 11 mm Proximitor Sensor

Bently Nevada 330878-91-CN 3300 XL 11 mm Proximitor Sensor: The Industry Standard for Precision Vibration and Displacement Monitoring

The Bently Nevada 330878-91-CN is a critical component of the renowned 3300 XL 11 mm Proximitor Sensor System. Manufactured by Bently Nevada (now part of Baker Hughes), this Proximitor sensor is the interface between the physical probe and your monitoring system, converting mechanical motion into precise electrical signals. Designed for seamless integration with 3300 XL 11 mm probes and extension cables, this unit is essential for protecting critical rotating machinery in industries like power generation, oil and gas, and manufacturing .

Key Benefits & Why Choose the 3300 XL System?

Extended Linear Range: The 11 mm probe tip provides a longer linear measurement range compared to standard 8 mm systems. This makes it the ideal choice for demanding applications such as axial (thrust) position measurements, steam turbine differential expansion, and reciprocating compressor rod drop monitoring .

True Component Interchangeability: Save time and eliminate costly bench calibration. All components of the 3300 XL system—probes, extension cables, and Proximitor sensors—are fully interchangeable without the need for matching or system calibration .

Superior Environmental Immunity: With improved Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) immunity, the 330878-91-CN meets CE certification standards without special installation requirements, ensuring reliable operation even in electrically noisy environments .

Technical Specifications (3300 XL 11 mm System)

Understanding the technical capabilities of the Proximitor system is key to specifying the right part.

Output Signal: 3.94 V/mm (100 mV/mil) 

Frequency Response: 0 to 8 kHz (0 to 8,000 Hz) 

Linear Range: 4 mm (160 mils) 

Operating Temperature: Designed to perform in harsh industrial conditions. (Note: The specific Proximitor model 330878-91-CN may have specific range details, always refer to the official datasheet).

Applications: Where Precision Matters Most

The Bently Nevada 330878-91-CN Proximitor is specifically engineered for machinery protection and condition monitoring where longer linear range is non-negotiable. Common applications include:

Axial (Thrust) Position Monitoring: Critical for detecting thrust bearing wear or failure .

Differential Expansion: Measuring the expansion differential between the rotor and casing in steam turbines .

Reciprocating Compressors: Monitoring piston rod position or rod drop .

Speed Measurement: Providing precise tachometer and zero-speed readings .

Keyphasor Reference: Generating a phase reference signal for synchronous vibration analysis .

Seamless Integration and Advanced Design

The 3300 XL Proximitor sensor features a slim, compact design that allows for flexible mounting options, whether on high-density DIN rails or traditional panels . It utilizes SpringLoc terminal strips, enabling fast, secure field wiring without the need for specialized tools. This ensures a robust connection that withstands industrial vibrations .

When paired with the 3300 XL 11 mm probe and extension cable, the system employs gold-plated brass ClickLoc connectors. These connectors lock positively in place, preventing loosening due to machine vibration, while the patented TipLoc and CableLoc designs ensure mechanical integrity of the probe tip and cable assembly .

Ordering Information: Decoding the Part Number

The part number 330878-91-CN specifically identifies a 3300 XL 11 mm Proximitor sensor. When ordering a complete transducer system, this sensor must be combined with a compatible 3300 XL 11 mm probe (e.g., 330701, 330703) and extension cable (e.g., 330730) to ensure optimal performance and reliability .

Upgrade Note: The 3300 XL 11 mm system is designed as a direct replacement for older 7200 series 11 mm and 14 mm systems. For a successful upgrade, all system components must be replaced simultaneously .

For over half a century, Bently Nevada has set the benchmark for machinery protection. The 330878-91-CN 3300 XL 11 mm Proximitor Sensor continues this legacy, offering unparalleled accuracy, durability, and ease of use. By choosing the 3300 XL system, you are investing in the reliability and longevity of your most critical assets.

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