Bently Nevada 330705-02-18-90-02-00 11 mm Reverse Mount Proximity Probe with 9.0 Meters Cable and 4.0 mm Linear Range

A1: The Bently Nevada 330705-02-18-90-02-00 sits in the 3300 XL 11 mm Probe family, more on the reverse mount side of things. In practice it’s used for eddy current proximity measurement, mainly for vibration and shaft displacement on machines with fluid film bearings.

You’ll usually see it around big rotating equipment — steam turbine monitoring, centrifugal or reciprocating compressor monitoring, that kind of environment. It handles axial thrust position measurement and also longer-range movement cases like ramp differential expansion tracking on steam turbines or rod drop monitoring on reciprocating compressors. Nothing unusual in application, just typical heavy rotating machinery protection work.

A2: The code looks heavy but it’s basically a configuration breakdown.

330705-02-18 → reverse mount 3300 XL 11 mm probe setup, with 3/8-24 UNF-2A threads, around 46 mm case length, and a small 5.0 mm unthreaded section
-90 → gives the 9.0 meters total length option (integrated probe cable)
-02 → gold-plated brass Miniature ClickLoc coaxial connector
-00 → no agency approval requirement, meant for non-hazardous installations

In real ordering work, people usually just treat it as a full fixed code, not something they “decode” every time.

A3: Installation-wise, it’s fairly straightforward but still needs proper tightening control. The probe uses a built-in Viton O-ring for sealing, mainly to stop oil migration or pressure leakage around the mounting point. Torque is usually set around 7.5 N·m (66 in·lb), and there’s a hard ceiling at 22.6 N·m (200 in·lb), beyond that risk starts to go up quickly. One thing to note — because it’s a reverse mount design, it doesn’t really support extras like stainless armor or FluidLoc style cable options. So the setup stays pretty fixed.

A4: Yes, and this is actually one of its common use cases. It often shows up in legacy 7200-series 11mm upgrade projects where older probes are being replaced. But it’s not just a drop-in swap — the whole measurement chain usually gets aligned to 3300 XL 11 mm Proximitor sensor standards. On the system side, it typically connects into a Bently Nevada 3500 monitoring system, and the calibration has to match the standard 3.94 V/mm (100 mV/mil) scale factor. If that part is ignored, the signal scaling won’t line up correctly, so most engineers will treat it as a full loop upgrade rather than a single component change.