Bently Nevada 330180-50-05 Proximitor Pre-amplifier for Critical Machinery Monitoring

The Bently Nevada 330180-50-05 is a Proximitor-style pre‑amplifier designed to condition eddy-current proximity probe signals for shaft vibration and position measurements. It’s typically used on compressors, turbines, and high‑speed pumps where reliable gap and dynamic vibration data are essential for protection systems and predictive maintenance. From my experience, this variant fits neatly into existing 3300‑series style transducer chains and keeps scaling consistent for plant historians and rack monitors.

• Proximitor pre‑amp for eddy-current probes – Conditions the probe signal and delivers both DC gap and AC vibration outputs used by monitors and PLCs.

• Standard vibration scaling – Typically 200 mV/mil (≈7.87 mV/µm), so you can trend displacement data consistently across assets.

• Buffered dynamic output – Allows connection of analyzers or portable data collectors without interrupting the protection loop.

• Robust industrial design – Appears to be intended for cabinet mounting with good immunity to electrical noise in most cases.

• Works with matched probe/cable sets – Typically paired with 3300‑series 5 mm or 8 mm probe systems (depending on option codes).

• 24 Vdc supply (negative supply conventions common) – Simple two‑wire power makes panel integration straightforward.

• Steam and gas turbines – shaft vibration and axial position monitoring tied to trip logic.

• Centrifugal and screw compressors – radial vibration and thermal growth (gap) trending.

• High‑speed pumps and fans – condition monitoring for cavitation and imbalance detection.

• Gearboxes and expanders – dynamic displacement for early fault identification.

• Generators and large motors – proximity probes on bearings for protection systems.

One thing I appreciate is how consistently these pre‑amps behave across mixed fleets. Even when machines differ, the scaling and buffered outputs stay predictable, which in many cases simplifies multi‑site data analysis.

• Reliability in harsh cabinets – Built for industrial noise environments; fewer nuisance readings when wiring is done correctly.

• Compatibility – Pairs with matched 3300‑series proximity probes and extension cables; keeps legacy and modern racks aligned.

• Lifecycle savings – Stable calibration and standardized scale factor reduce setup time and re‑work during turnarounds.

• Supportability – Clear analog outputs make it easy for maintenance teams to validate with a multimeter or scope.

• Cabinet & mounting – Install in a ventilated panel (IP54 or better is typical). Keep high‑voltage and VFD cables well separated to minimize EMI.

• Power & grounding – Provide a clean 24 Vdc supply (negative supply convention may apply). Bond shields at the monitor end and follow single‑point grounding practices.

• Cabling – Use the matched probe and extension cable lengths defined by the option codes; avoid mixing lengths as it changes system calibration.

• Gap setup – Set mechanical gap per machine OEM guidelines, then verify DC gap voltage (it should align with the expected mV/µm conversion).

• Verification – Check dynamic output with a portable analyzer during commissioning; confirm ~200 mV/mil scale on a known displacement.

• Routine care – Periodically inspect terminals for looseness, clean dust from the cabinet, and check cable integrity. Re‑verify scale after any probe replacement.

• Safety – De‑energize before wiring; follow site electrical safety and lockout procedures. In hazardous areas, ensure barriers and approvals are properly observed.

• CE compliant; RoHS alignment commonly available on current supply.

• Manufactured under ISO 9001 quality systems.

• Warranty: typically 1 year from shipment (terms may vary by region and supply channel).

• 3300‑series proximity probes (5 mm or 8 mm) matched to the system option codes.

• Matched extension cables in the specified length to maintain calibration.

• Rack monitors or protection systems expecting 200 mV/mil proximity inputs.

• 
  

If you’re aligning spares across multiple machines, this model seems to hit the sweet spot for compatibility and serviceability. You might notice your commissioning time drops simply because the scaling behaves exactly as the team expects.