Bently Nevada 330101-37-57-10-02-05 – Proximity Probe for Vibration and Shaft Displacement Monitoring

The Bently Nevada 330101-37-57-10-02-05 is a 3300 XL-series 5 mm eddy-current proximity probe designed for continuous vibration, shaft radial position, and axial thrust measurements on critical rotating machinery. It pairs with a matching 3300 XL Proximitor sensor and extension cable to deliver a precise, stable analog signal that most condition monitoring and protection systems recognize.

From my experience, this model is typically chosen when you need reliable non-contact measurement in tight spaces or where an 8 mm probe won’t fit. It seems to be a solid choice for compressors, steam/gas turbines, large pumps, and gearboxes where consistent scale factor and long-term stability matter.

• Non-contact eddy-current sensing – Measures dynamic vibration and static shaft position without touching the rotor, minimizing wear and installation complexity.

• Factory-matched system – Probe, extension cable, and Proximitor are matched for system length to maintain linearity and the standard 200 mV/mil (7.87 mV/µm) scale factor.

• 5 mm tip for tighter spaces – Typically preferred where probe real estate is limited or on smaller journal bearings.

• Stable output – When paired with the correct 3300 XL Proximitor, delivers a steady analog voltage suitable for API 670 protection systems and most data acquisition racks.

• Industrial-grade build – Rugged probe construction and cable options designed for harsh temperatures, oil environments, and continuous service.

• Drop-in compatibility – Works within the established Bently Nevada 3300 XL ecosystem that many plants already standardize on.

You might notice this probe turning up in units where downtime costs are heavy and signal stability matters. Typical uses include:

• Steam and gas turbines – radial vibration and thrust position

• Compressors and expanders – bearing vibration and shaft centerline

• Pumps and fans – early detection of rubs, misalignment, and imbalance

• Gearboxes and generators – monitoring dynamic behavior under load

• Reliability – Proven 3300 XL lineage that plants typically standardize on for API 670 protection.

• Compatibility – Works with existing 3300 XL systems; simplifies spares and training.

• Lifecycle Costs – Stable calibration helps reduce nuisance trips and investigative maintenance time.

• Technical Support – Widely documented, with clear setup practices and ready availability of accessories.

“Swapping in the 330101 probe on our compressor bearing gave us clean bias voltage and steadier vibration trending. No need to rework the bracket—saved us a shift.” — Maintenance Supervisor, petrochem client

• Mounting – Use the correct threaded boss and jam nut; ensure a rigid bracket with minimal mechanical resonance. Align the probe tip normal to the rotor surface.

• Gap setting – Set the initial gap to achieve the recommended DC bias at the monitor (in many cases around mid-range). Verify with your Proximitor/monitoring system.

• Wiring & routing – Keep probe and extension cables away from high-voltage lines and VFD outputs. Maintain shielding continuity and proper grounding.

• Cabinet & ventilation – Install Proximitor modules in a clean, ventilated cabinet per manufacturer guidance; 24 Vdc supplies should be clean and well regulated.

• Routine checks – Periodically confirm bias voltage, inspect probe tip for fouling, and verify tightness of the jam nut. Clean oil/varnish buildup gently; avoid abrasive contact.

• Calibration – When possible, validate scale factor using a calibrated target (typically AISI 4140 steel) and confirm linearity across the working gap.

• Manufactured under ISO 9001 quality systems

• CE and RoHS compliant; hazardous-area approvals (such as ATEX/IECEx) available on specific configurations

• Standard manufacturer’s limited warranty (commonly 1 year); extended coverage may be available

• 330180 Proximitor Sensor (3300 XL, 5 mm) – Provides the drive/signal conditioning for the probe; outputs the standard 200 mV/mil (7.87 mV/µm) signal.

• 330130 Extension Cable (3300 XL) – Factory-matched to complete the specified system length coded in your model number for best accuracy.

If your current bracket, thread form, or system length differs, we can match the probe to your installed hardware and keep the same calibration performance. One thing I appreciate is how consistent the 3300 XL family stays across different configurations—less hassle during turnarounds.