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Help CenterBently Nevada 330101-00-20-10-02-05 Proximity Probe for Vibration and Shaft Displacement
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The Bently Nevada 330101-00-20-10-02-05 is a non-contact eddy-current proximity probe designed for precise measurement of shaft vibration and relative displacement in rotating equipment. It’s widely used with Bently Nevada 3300/3500 condition monitoring systems for turbomachinery, compressors, pumps, and large motors. From my experience, this series is chosen when plants need dependable measurements in hot, oily, and high-vibration environments, without constant adjustment.
Key Features3300 XL family compatibility – Works with Bently Nevada Proximitor sensors and monitors (e.g., 3500 and legacy 3300) for a proven, end-to-end measurement chain.
8 mm probe tip with standard calibration – Typically calibrated to AISI 4140 steel; delivers the classic 200 mV/mil (≈7.87 mV/µm) system sensitivity with the correct Proximitor and extension cable.
Wide linear range – In many cases, the 8 mm system provides about 80 mils (≈2.0 mm) of linear measurement for both vibration and position readings.
High-temperature capability – Probe and cable are typically rated up to around 177 °C, so hot bearing housings aren’t a problem.
Rugged, sealed construction – Designed for industrial environments; oil, moisture, and dust are common but rarely troublesome when installed correctly.
Flexible mounting options – Available in common metric and UNF thread formats and lengths to match your machine geometry.
Stable bias and low noise – When paired with the right Proximitor, you get a stable DC gap voltage and clean dynamic signal for accurate trending and alarms.
| Brand / Model | Bently Nevada 330101-00-20-10-02-05 (3300 XL series proximity probe) |
| Probe Type | Non-contact eddy-current proximity probe, 8 mm tip (typ.) |
| System Sensitivity | 200 mV/mil (≈7.87 mV/µm) with matching 3300 XL Proximitor and extension cable |
| Linear Range | ≈80 mils (≈2.0 mm), application-dependent |
| Power Requirements | Probe itself passive; Proximitor typically powered by +24 VDC |
| Operating Temperature | Typically −51 to +177 °C for probe/cable assemblies |
| Signal I/O | Probe coil to Proximitor; Proximitor provides DC gap voltage and dynamic vibration output (voltage) |
| Thread / Mounting | Threaded mount with locknut and spacer; common options include M8x1 or 3/8–24 UNF (as ordered) |
| Dimensions & Weight | 8 mm tip diameter; probe lengths vary by option code; lightweight stainless-steel body |
| Communication Interfaces | N/A (analog signal chain via Proximitor) |
| Installation Method | Threaded probe into bracket/boss, set gap with feeler/spacer, route to extension cable and Proximitor |
You’ll typically find the 330101 on critical rotating assets where early fault detection matters. It measures relative shaft vibration for protection and trending, and can also capture slow-moving position (axial thrust) when configured that way.
Steam and gas turbines – radial vibration monitoring at bearings, axial position with thrust collars
Compressors and expanders – casing-mounted brackets for shaft vibration and rub detection
Pumps and fans – early warning on imbalance, misalignment, and fluid-induced instabilities
Large motors and generators – bearing pedestal monitoring for shaft motion and looseness
A maintenance supervisor in a petrochemical plant told us they swapped a worn probe with the 330101 during a short outage and were trending clean signals within the hour—no rewiring of the rack, just a re-gap and go.
Advantages & ValueHigh reliability – The 3300 XL line is a go-to in refineries and power plants; failure rates are low when cabling is protected and bend radius respected.
System compatibility – Plays nicely with existing Bently Nevada Proximitors and 3500/1900 monitors, which often means zero re-engineering.
Total lifecycle savings – Durable construction and predictable calibration reduce retests and unplanned trips, which in many cases matters more than initial unit price.
Technical support and parts availability – Spares, brackets, and extension cables are commonly stocked, so turnarounds are faster.
Mounting – Use a rigid bracket or boss; thread the probe and lock with the supplied nut. Set the initial gap (often ~1.0 mm / 40 mil) using the spacer. Keep at least one probe diameter of side clearance from adjacent metal when possible.
Wiring – Route the probe lead to the matched extension cable, then to the Proximitor in a ventilated cabinet. Keep low-level probe wiring separated from high-voltage lines, and ground per plant standards to minimize noise.
Environment – The probe is sealed, but good practice is to avoid sharp bends; maintain bend radius per datasheet and protect leads from hot surfaces and mechanical damage.
Safety – In hazardous areas, verify the exact option code approvals before installation. De-energize the cabinet before servicing the Proximitor wiring.
Routine checks – Periodically verify DC bias voltage at the Proximitor and confirm sensitivity with a micrometer fixture (200 mV/mil target). Inspect connectors for oil ingress and retorque locknuts during outages.
Firmware/monitoring – If paired with a 3500 rack, keep module firmware current and document alarm setpoints as part of your MOC process.
CE and RoHS compliance on standard variants; UL/CSA and hazardous area approvals are available on selected option codes
Manufactured under ISO 9001 quality systems (manufacturer)
Typical manufacturer’s warranty: 12 months from shipment (varies by region and option)
Bently Nevada 3300 XL Proximitor Sensor – converts probe/extension signals to usable DC gap and dynamic outputs
Bently Nevada 3300 XL Extension Cable – matched length to maintain system calibration
Mounting brackets, spacers, and locknuts – to position the probe correctly on bearing housings
3500 Monitoring System modules – for protection relays, trending, and condition monitoring
If you can share your existing extension cable length and Proximitor part number, I can confirm system length and sensitivity for this exact 330101-00-20-10-02-05 option code and make sure it drops in without recalibration surprises.
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