The BENTLY 330980-51-00 is part of the NSv (Narrow Side view) line, developed for machinery with small shafts or restricted installation envelopes. Standard proximity probes require a specific "clear space" around the tip to avoid side-loading the magnetic field. The NSv Proximitor is tuned to handle the smaller 3300 NSv probes, which have a tighter field pattern, allowing them to provide accurate vibration and gap data in cramped quarters such as centrifugal compressors and aero-derivative turbines.
Like all Bently Nevada proximitors, the 330980-51-00 converts the RF signal from the probe into a DC voltage (the Gap) and an AC voltage (the Vibration). The "51" option indicates the system length and mounting configuration, typically a 5.0-meter system for DIN rail mounting. It provides a linear output of 200 mV/mil (7.87 V/mm), ensuring compatibility with standard 3500 and 3300 monitoring racks.

Electrical isolation is a hallmark of the 330980-51-00. It is designed to be mounted on a DIN rail while maintaining isolation between the sensor signal and the rack power supply. This prevents ground loops that can occur in large industrial complexes. The module includes transient protection to shield the internal electronics from voltage spikes on the power line (-24VDC), ensuring consistent operation in unstable electrical environments.
The 330980-51-00 is calibrated for specific shaft materials (typically AISI 4140 steel). However, its advanced circuitry allows it to provide reliable readings on a variety of metallic targets with minimal error. The "00" option indicates it is the standard version without specialized regional hazardous area certifications, though it is built to the same high quality as certified units.
The 330980-51-00 features an "OK" circuit that monitors the proximity probe and extension cable for open or short circuits. This proactive diagnostic ensures that the monitor only processes valid data. Because the NSv system is often used in high-precision, small-clearance bearings, the reliability of the 330980-51-00 is essential for preventing catastrophic rotor-to-stator contact during high-vibration events.



