Bently Nevada 330878-90-05 3300 XL 50mm Proximitor Sensor

The model 330878-90-05 is a part of the 3300 XL 50 mm proximity transducer system. Unlike standard sensors, the 50 mm design is built to withstand extreme temperatures, operating continuously at up to 200°C (392°F) and surviving intermittent exposure up to 250°C (482°F) . This makes it the ideal choice for high-temperature applications like turbine case expansion or differential expansion monitoring where standard sensors would fail .

Key Specifications

Part Number: 330878-90-05

System Length: 9.0 meters (29.5 feet) 

Mounting Configuration: Panel mount 

Temperature Rating: Operates continuously up to 200°C (392°F)

Approvals: Standard configuration (typically "00" for no specific approvals or "05" for specific certifications) 

Advanced Features and Design

High-Temperature FluidLoc Cable

The 330878-90-05 utilizes FluidLoc cable technology, which is standard for all 50mm probes. This specialized cable construction prevents moisture ingress into the probe tip, ensuring signal integrity and longevity even in condensing or wet environments .

Enhanced Reliability

The sensor features improved RFI/EMI immunity, allowing it to operate in electrically noisy environments without special installation considerations. This ensures the sensor maintains CE compliance and delivers clean, accurate signals for your monitoring systems .

Flexible Installation

Designed for versatility, the 330878-90-05 features a slim profile that supports both high-density DIN rail mounting and traditional panel mounting configurations . The SpringLoc terminals allow for fast, secure field wiring connections without the need for specialized installation tools, significantly reducing setup time and ensuring reliable connectivity .

System Compatibility

This Proximitor is fully backward compatible with other non-3300 XL series components, providing flexibility for system upgrades and replacements. It works seamlessly with 3300 XL 50 mm probes and extension cables to output a voltage signal proportional to the gap between the probe tip and the observed conductive surface .

Applications

The Bently Nevada 330878-90-05 is essential for measuring both static (position) and dynamic (vibration) values, specifically for:

Fluid Film Bearing Machines: Vibration and position monitoring .

Steam Turbines: Differential expansion and case expansion measurements .

Keyphasor Reference: Providing a timing reference for speed measurement and phase analysis .

For industrial facilities requiring uncompromising reliability in high-temperature environments, the Bently Nevada 330878-90-05 delivers the precision and durability necessary to protect critical rotating assets and avoid unplanned downtime.