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Help CenterBently Nevada 330105-02-12-10-02-05 Proximity Probe – Non-contact Vibration and Shaft Displacement for Critical Rotating Assets
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The Bently Nevada 330105-02-12-10-02-05 is a 3300 XL series 8 mm eddy-current proximity probe designed for continuous, non-contact measurement of shaft vibration and position. It’s built for reliability in demanding environments—typically paired with a 3300 XL 5 mm/8 mm Proximitor sensor and an extension cable for a fully matched transducer system. From my experience, this model is a straightforward choice for compressors, turbines, and high-speed pumps where dependable radial vibration and shaft displacement data really matters.
Key Features3300 XL system compatibility – Works with Bently Nevada 3300 XL 5 mm/8 mm Proximitor sensors for consistent 200 mV/mil (≈7.87 mV/μm) scaling.
8 mm probe tip – A practical choice for radial shaft vibration; provides robust linear range and good standoff tolerance in most cases.
Matched probe–cable–driver architecture – The probe is factory matched to the extension cable and Proximitor, helping maintain calibration accuracy on AISI 4140 steel targets.
Industrial-grade build – Typically rated for high temperatures and harsh conditions when correctly installed; sealed construction resists oil and contaminants.
Flexible mounting – Threaded body with jam nuts; commonly installed through machine housings or brackets for radial or axial monitoring points.
Stable linear range – Typically up to 2.0 mm (80 mil) with the proper Proximitor, giving reliable dynamic vibration and DC gap data.
Service-friendly – Microdot-style coax connection at the probe end and clear terminal/BNC access at the Proximitor reduce downtime during checks.
| Brand / Model | Bently Nevada 330105-02-12-10-02-05 (3300 XL series proximity probe) |
| Measurement Principle | Non-contact eddy-current (proximity) measurement on ferromagnetic targets (calibrated to AISI 4140 steel) |
| Sensitivity (with matched Proximitor) | ≈ 200 mV/mil (≈ 7.87 mV/μm) nominal |
| Linear Range (typical) | Up to ~2.0 mm (80 mil), dependent on full transducer matching |
| Probe Tip / Body | 8 mm tip; threaded body with jam nuts (thread form per build code; commonly M10×1 or UNF variants) |
| Operating Temperature (probe) | Typically up to +177 °C (probe/cable options vary by build); consult the specific code for exact rating |
| Power Requirements | Via 3300 XL 5 mm/8 mm Proximitor Sensor (driver typically powered at about −24 VDC) |
| Signal I/O (system) | Dynamic vibration voltage + DC gap voltage from Proximitor; probe connects by Microdot-style coax to extension cable |
| Communication Interfaces | Not applicable at probe level; Proximitor provides terminal strip and test jack (BNC) on many versions |
| Installation Method | Threaded insertion through machine casing or bracket; lock with jam nuts; gap set with feeler gauge |
| Environmental Protection | Sealed design for oil/contaminant exposure; IP rating depends on build and installation quality |
Typical installations include API 610 pumps, steam/gas turbines, centrifugal compressors, motors, gearboxes, fans, and expanders. You might notice that maintenance teams use this probe mostly for radial vibration on critical bearings, shaft relative displacement, and phase reference points when integrated into a full Bently Nevada monitoring system.
Radial shaft vibration on journal bearings (most common use case)
Shaft position (DC gap) trending for slow thermal growth and alignment checks
Axial movement on thrust bearings (where 8 mm clearance and geometry permit)
Condition monitoring and protection systems in refineries, power plants, and chemical facilities
Feedback we hear a lot: “After upgrading our compressor train, the 3300 XL 8 mm probes have been repeatable and stable—no drift after shutdowns,” which seems to be consistent with what we see in most field audits.
Reliability in harsh service – Proven in oil-lubricated, high-temperature bearing housings where cheaper probes struggle.
Drop-in ecosystem compatibility – Pairs with 3300 XL Proximitor sensors and standard extension cables to maintain calibration and scaling.
Reduced lifecycle risk – Stable sensitivity and linearity help keep protection trip points consistent after outages or rebuilds.
Procurement-friendly – Common spares strategy across multiple machines; simplifies stocking and technician training.
Technical support – Clear documentation and widely-known installation practices shorten commissioning time.
3300 XL 5 mm/8 mm Proximitor Sensor – The driver that powers the probe and outputs the vibration and gap signals (−24 VDC supply, panel or DIN mounting).
330130 Extension Cable – Coaxial cable between probe and Proximitor; available in standard lengths (e.g., 5 m, 7 m, 9 m). Correct matching is essential for calibration.
Probe mounting hardware – Brackets, sleeves, and protective armor as required by the machine casing and routing path.
Cabinet and environment – Mount the Proximitor in a dry, ventilated panel; follow EMC practices; avoid routing probe cables near high-voltage drives when possible.
Mechanical mounting – Use the specified thread and jam nuts; keep the probe orthogonal to the shaft surface. A rigid bracket minimizes vibration-induced bias.
Gap setting – Set the cold gap to the recommended range (often around 1.0 mm / 40 mil) using a feeler gauge; verify DC gap voltage after warm-up.
Target material – Calibrated for AISI 4140 steel; if your target differs, consider correction factors or consult for application-specific calibration.
Wiring – Use the matched extension cable; ensure clean Microdot connections and proper strain relief. Keep connectors clean and dry.
Routine checks – Periodically confirm gap, inspect cable jacket/armor, clean probe tips if fouled, and document readings for trend analysis. Firmware updates apply to the monitoring rack, not the passive probe.
Safety – De-energize machinery and follow lockout-tagout before insertion/removal; confirm clearance from rotating parts.
CE and RoHS compliance (typical for 3300 XL transducer systems)
UL/CSA or equivalent safety approvals on associated Proximitor hardware (varies by build)
Hazardous area approvals (ATEX/IECEx/CSA) available on designated variants; check the full build code
Manufacturer’s limited warranty: typically 1 year on new units
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