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Help CenterBently Nevada 330105-02-12-90-12-CN – Proximity Probe for Critical Vibration and Shaft Position Monitoring
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The Bently Nevada 330105-02-12-90-12-CN is a non-contact eddy-current proximity probe engineered for continuous monitoring of rotating machinery. Paired with the matching 3300 XL Proximitor Sensor and extension cable, it typically delivers stable, API 670–grade measurements for shaft vibration, radial position, and thrust (axial) position. From my experience, this model is a go-to choice when you need dependable data in demanding environments—compressors, turbines, high-speed pumps, and gearboxes.
The “-CN” suffix usually indicates a China-market labeling/packaging variant; the probe performance itself remains consistent with the 3300 XL transducer system family. You might notice that different option codes in the part number specify thread type, cable length, and other mechanical details, which is helpful when matching existing installations.
Key FeaturesNon-contact eddy-current measurement – Provides continuous vibration and position feedback on metal targets without physical contact, reducing wear and drift.
System sensitivity typically 200 mV/mil (≈7.87 mV/µm) – When used with the matching 3300 XL Proximitor Sensor, enabling precise, field-proven signal scaling.
Usable linear range – In many cases 2–4 mm depending on tip size and setup, suitable for both radial vibration and axial (thrust) measurements.
Integrated low-noise coaxial cable – Option codes define length and armor; the “-90-” position often denotes a longer integral cable for flexible routing in large machines.
Rugged probe construction – Typically stainless-steel body with robust sealing; designed for harsh temperature and vibration environments found in heavy industry.
Wide system compatibility – Works with Bently Nevada 3300/3500 series monitors and commonly used in API 670-compliant protection systems.
Threaded mounting – Straightforward installation into brackets or bearing housings with locknut positioning for repeatable gap setting.
| Parameter | Details |
|---|---|
| Brand / Model | Bently Nevada 330105-02-12-90-12-CN |
| Measurement Principle | Non-contact eddy-current proximity probe for metal targets |
| System Sensitivity | Typically 200 mV/mil (≈7.87 mV/µm) with matched 3300 XL Proximitor Sensor |
| Usable Linear Range | Commonly 2–4 mm depending on probe tip and setup; verify with final configuration |
| Power Requirements | Powered via Proximitor/monitor (probe itself requires no direct power) |
| Signal Input/Output | Probe connects by coax to Proximitor; Proximitor outputs DC gap and dynamic vibration to the monitor |
| Operating Temperature (probe) | Typically -35 °C to +177 °C depending on variant; high-temp versions available |
| Cable / Length | Integral low-noise coax; length and armor as defined by option codes (the “-90-” option generally indicates a longer cable) |
| Communication Interfaces | N/A (analog transducer system) |
| Installation Method | Threaded mounting into rigid bracket/housing; locknut to set nominal gap per API 670 practices |
| Dimensions & Weight | Varies by option codes (tip diameter and body length). In many cases 8–11 mm tip and 50–80 mm body length; confirm before build. |
This probe is typically specified across oil & gas, petrochemical, power generation, steel, paper, and general rotating equipment OEMs. It’s widely used on steam/gas turbines, centrifugal compressors, critical pumps, fans, gearboxes, and motors where protection systems demand reliable, low-noise signals.
A common scenario I see: a refinery replaces aging probes on a 2–5 MW compressor train and pairs the 330105 series with a 3500 rack. Feedback has been consistent—cleaner dynamic signals and fewer nuisance alarms after proper gap reset and cable dressing.
Reliability in harsh service – From my experience, these probes hold calibration well and resist electrical interference when the cable is routed correctly.
System compatibility – Seamless with 3300/3500 monitors and common protection/condition monitoring setups, simplifying spares and commissioning.
Lower lifecycle risk – Proven signal stability typically reduces unscheduled callouts and helps keep API 670 compliance straight.
Configuration flexibility – Option-coded lengths, threads, and armor make retrofits easier without reworking brackets.
Global support – Documentation, calibration guidance, and replacement availability are solid in most regions.
Mounting – Install in a rigid, vibration-free bracket; set the nominal gap to the recommended range (often around 1.0 mm for 8 mm systems) using feeler gauges or a dial indicator.
Wiring – Use the specified Bently Nevada extension cables and Proximitor; avoid splices. Route away from high-voltage leads and VFD outputs; keep bend radius gentle.
Cabinet & ventilation – House Proximitor/monitor modules in a clean, ventilated panel. Maintain grounding and shield termination per manufacturer guidance.
Safety – Lockout/tagout rotating equipment. In hazardous areas, ensure the complete transducer loop and monitoring hardware meet the required area classifications.
Routine checks – Periodically verify bias (gap) voltage at the Proximitor, inspect cable armor and connectors, and confirm linearity with a proximity calibrator if available.
Cleaning – Keep the probe tip and target area free of oil/scale. Use non-residue solvents; avoid abrasive cleaning that could alter the target surface.
Firmware & records – Keep monitor firmware current and document probe/cable part codes to maintain traceability for future replacements.
CE marking and RoHS compliance are standard for most Bently Nevada 3300 XL components.
Designed for use in API 670–compliant protection systems when paired with matching Proximitor and monitors.
Manufacturer’s limited warranty typically 1 year from shipment (region and configuration dependent).
Quick note on the code: 330105-02-12-90-12-CN includes option fields for mechanical thread and cable configuration. It appears the “-90-” portion commonly denotes a longer integral cable; please share your existing bracket thread and the required cable length so we can confirm exact compatibility before order.
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