Bently Nevada 330878-91-05 3300 XL 11 mm Proximitor Sensor

The Bently Nevada 330878-91-05 is a high-performance 11 mm Proximitor sensor from the advanced 3300 XL series. Designed as a direct replacement for older 7200 series 11 mm and 14 mm systems, this sensor is the industry standard for non-contact vibration and displacement measurement in critical machinery protection.

Key Features & Benefits

Extended Linear Range: The 11 mm probe tip provides a longer linear range (approximately 2 mm or 80 mils) compared to standard 8 mm systems, making it essential for demanding applications like axial thrust position and differential expansion measurements .

Superior Environmental Immunity: Features improved RFI/EMI immunity, meeting CE mark approvals without requiring special shielded conduit. This ensures reliable operation in electrically noisy environments and reduces installation costs .

Robust Connectivity: Equipped with gold-plated brass ClickLoc connectors that require only finger-tight torque. The patented locking mechanism prevents loosening due to vibration, ensuring signal integrity .

Flexible Mounting: The slim-profile Proximitor supports both high-density DIN-rail and traditional panel mounting. The SpringLoc terminal strips enable fast, secure field wiring without special tools .

Interchangeable Components: Supports complete component interchangeability (probe, cable, sensor) without the need for individual matching or bench calibration, simplifying maintenance and inventory .

Technical Specifications (Model 330878-91-05)

Product Code: 330878-91-05

System Length: 9.0 meters (29.5 feet) 

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

Linear Range: 0.25 mm to 2.3 mm (10 to 90 mils), approximately -1 to -17 Vdc 

Calibration: Factory calibrated to AISI 4140 steel target 

Mounting: Panel mount configuration 

Protection Rating: IP67 

Applications

The 3300 XL 11 mm system is ideal for fluid-film bearing machines, specifically for:

Axial (thrust) position monitoring

Ramp differential expansion on steam turbines

Rod position/drop measurement on reciprocating compressors

Keyphasor* reference and zero speed measurements