The Bently Nevada 330180-51-05 is a 3300 XL Proximitor Sensor with 51 series configuration and 5-meter system rating, featuring specialized electrical specifications and connector options adapted for particular application requirements. This compact proximitor sensor provides high-precision signal conditioning for 8mm eddy current proximity probes, converting the probe's impedance changes into a linear voltage output that accurately represents the distance between the probe tip and the conductive target surface. The 51 series configuration includes specific calibration settings, output characteristics, or connector configurations that distinguish it from standard 12 series units, often tailored for particular machinery OEM specifications or system integration requirements. The compact housing design allows for flexible installation in equipment racks, junction boxes, or field-mounted enclosures where space is limited. The 330180-51-05 operates on standard -24 VDC supply voltage and provides a buffered output signal with 7.87 V/mm sensitivity for 8mm probe systems, ensuring accurate measurement of shaft vibration, axial position, and rotational speed. The unit includes comprehensive electrical protection features including overvoltage protection, reverse polarity protection, and output short-circuit protection, ensuring reliable operation in industrial environments. Rated for temperatures from -40°C to +85°C, this proximitor sensor is designed for use with 3300 XL 8mm probes and extension cables in 5-meter total system length configurations. The complete transducer system maintains API 670 compliance and delivers the proven reliability required for critical rotating machinery protection and condition monitoring applications.