Bently Nevada 330106-05-30-90-12-CN Proximity Probe for Non‑contact Vibration & Shaft Displacement Monitoring

The Bently Nevada 330106-05-30-90-12-CN is a non-contact eddy-current proximity probe designed for continuous monitoring of shaft vibration, radial/axial displacement, and rotor position on critical rotating machinery.    Paired with a matching 3300 XL Proximitor Sensor and an extension cable, it delivers the familiar 200 mV/mil system sensitivity many plants rely on for API 670-compliant measurements.    From my experience, the right‑angle cable exit (-90) and the integral 5 m lead (-05) make routing inside tight machine guards much easier.

• Non-contact eddy-current sensing – Measures shaft vibration and displacement without mechanical wear, ideal for high-speed rotors.

• System sensitivity typically 200 mV/mil (7.87 mV/µm) – When used with the matching 3300 XL Proximitor Sensor, enabling consistent diagnostics and trending.

• Right‑angle cable exit (-90) – You might notice this helps in compact bearing housings and congested cable trays.

• Integral 5 m cable (-05) – Reduces junctions and potential noise ingress; in many cases it simplifies installation inside API 610/617 machines.

• Robust, industrial build – Probe and cable materials resist oil, vibration, and temperature swings common around turbines and compressors.

• Compatible with 3300/3500 series monitors – Maintains continuity with installed Bently Nevada systems for orbit, Smax, and axial position measurements.

• API 670-aligned practices – The transducer system is widely used in API 670 applications for critical protection and condition monitoring.

This probe is typically selected for turbines, compressors, pumps, gearboxes, and large fans where continuous vibration and position monitoring are mandatory.    In many cases, maintenance teams use it for radial vibration on bearings, thrust position on axial probes, and shaft phase reference when combined with Keyphasor inputs.

• Reliability – Proven Bently Nevada transducer performance; stable readings that trend well across shutdowns and startups.

• Compatibility – Works with installed 3300/3500 monitors, so you keep your diagnostics, alarm setpoints, and existing historian tags.

• Installation flexibility – The -90 cable exit and integral -05 lead help reduce cable stress and junction noise, which seems to be a frequent source of nuisance trips.

• Lifecycle cost – Fewer retrofits, easier spares pooling, and strong local support typically reduce long-term maintenance costs.

One thing I appreciate is how consistent the readings are after machine reassembly. A maintenance lead at a gas processing plant told us: “We swapped to the 330106 series on our compressor trains; the 90-degree exit saved us from repeated cable chafing at the bearing cap.”

• Mounting – Use the specified thread and locknut; maintain the recommended standoff and gap to the shaft (set with feeler gauges). Avoid bending the cable below the minimum radius.

• Cabinet & wiring – Route the probe cable to the Proximitor in shielded conduit where possible. Keep separation from high-voltage lines. Properly ground the Proximitor and monitor.

• Ventilation – Ensure monitor/protection panels have adequate ventilation; ambient heat near the machine often creeps higher than expected.

• Safety – De-energize the monitor loop before touching terminations. Lockout/tagout moving equipment. Verify insulation and shielding continuity.

• Routine care – Periodically verify gap and bias voltage, inspect for insulation damage or oil ingress, and clean probe tips gently if fouling occurs. Firmware updates on the monitoring rack can improve filtering and diagnostics.

• Calibration – Perform system checks with a known target material and distance blocks; document bias and scale to maintain API 670 audit trails.

• Quality – Built to Bently Nevada’s transducer system standards for industrial machinery protection.

• Certifications – CE and RoHS compliance are typical for this series; hazardous area options may be available depending on suffix. Please confirm required approvals before ordering.

• Warranty – Manufacturer’s standard warranty applies (commonly 1 year for new sensors).

• Matching 3300 XL Proximitor Sensor (for the same tip type and length code)

• Extension Cable (e.g., 330130 series) in the required length to reach the Proximitor

• Mounting brackets and locknuts matching the thread code (-30 / -12 suffixes)

• 3300/3500 monitoring rack channels for vibration and axial position as needed