Bently Nevada 330851-06-000-070-50-00-05 3300 XL 25 mm Proximity Probe with M39x1.5 Metric Thread and 5.0 Metres Integrated Triaxial Cable

The Bently Nevada 330851-06-000-070-50-00-05 is basically a 3300 XL 25 mm proximity probe used in rotating machinery monitoring. You’ll usually find it installed on steam turbines, gas turbines, compressors, and large generators, where shaft condition needs to be tracked continuously. In practice, it sits in the machinery protection system measuring shaft vibration and displacement without physical contact. So it’s watching shaft movement, axial position, and vibration trends in real time — nothing fancy in concept, but critical in operation for industrial rotating machinery condition monitoring.

It works with eddy current sensing technology. The probe doesn’t touch the shaft — it reads the gap between the probe tip and the conductive target surface. That raw signal then goes through the Bently Nevada Proximitor system, where it gets converted into usable vibration and displacement data. This setup is pretty standard in API 670 compliant systems for turbine monitoring.

In this configuration, the “50” simply refers to an integrated 5.0-meter triaxial cable. So instead of separate extension wiring, the probe already comes with a fixed cable length. It plugs directly into a compatible Bently Nevada 3300 XL system setup.

Yes, the 330851-06-000-070-50-00-05 is generally compatible with Bently Nevada 3500 systems, as long as it’s used with the right Proximitor input modules such as 3500/40M or 3500/42M. In real setups, it’s usually part of a machinery protection loop on turbines or compressors, where the 3300 XL 25 mm proximity probe feeds vibration and displacement signals into the 3500 monitoring system for continuous condition tracking.

Mostly in heavy-duty rotating equipment. Things like steam turbine differential expansion measurement, generator shaft vibration monitoring, and compressor condition monitoring. Power plants and oil & gas facilities use it a lot, especially where critical asset condition monitoring is required.

The full part number breaks down into configuration details of a 3300 XL 25 mm proximity probe — housing type, probe structure, cable length, and unarmored design. It’s basically Bently’s way of defining exact build options inside the 3300 XL transducer system, so every segment of the code maps to a specific hardware choice.