Bently Nevada 330103-00-05-05-02-00 – 8 mm Proximity Probe for Shaft Vibration and Position Monitoring

The Bently Nevada 330103-00-05-05-02-00 is an 8 mm eddy-current proximity probe from the 3300 XL family, intended for critical machinery measurements such as shaft vibration, radial position, and thrust position when paired with a matching 3300 XL Proximitor sensor and extension cable. From my experience, this configuration is selected when users want the robust mechanical build of the 8 mm tip along with the long-term stability that 3300 XL systems are known for in API 670 environments.

Order Placement Process and Guarantees

Key Features

• 8 mm 3300 XL probe – Designed for heavy-duty turbomachinery where mechanical robustness and stable gap control matter.
• System accuracy with Proximitor – When paired with a 3300 XL Proximitor, the system provides the standard −200 mV/mil (≈7.87 mV/μm) output used by most API 670 monitors.
• Typical linear range – Approximately 2.0 mm (80 mil) linear measurement range on AISI 4140 steel targets.
• High temperature tolerance – Probe tips typically rated up to 177°C; suitable for hot bearing housings and casings.
• Ruggedized cabling – Options for integral armor and threaded mounting help in areas with oil splash, EMI, and vibration.
• System-length matching – Works as part of 5 m / 7 m / 9 m calibrated systems with the correct extension cable and Proximitor.
• API 670 ecosystem – In many cases used in API 670-compliant protection systems (when integrated with compatible monitors).
• Material calibration – Factory calibration for AISI 4140 steel; other target materials typically require correction factors.

Technical Specifications

Application Fields

You might notice this probe most often on rotating assets where downtime costs bite. Typical placements:

• Gas and steam turbines — radial shaft vibration and shaft relative position
• Large compressors and expanders — casing-mounted radial probes with axial thrust pairs
• Pumps and fans — bearing housing vibration and shaft orbit measurements
• Gearboxes — shaft position and relative vibration to catch tooth or bearing defects early

A maintenance lead at a combined-cycle plant shared that swapping to 3300 XL 8 mm probes “stabilized our gap readings through hot restarts,” which seems to be consistent with what we see in high-temperature housings.

Advantages & Value

• Reliability in harsh service – The 8 mm mechanical form handles heat, oil, and vibration better than smaller tips in many cases.
• Compatibility and continuity – Works with the standard 3300 XL ecosystem, simplifying spares and calibration.
• Lifecycle cost – Fewer probe replacements and less drift typically mean lower maintenance spend over multi-year runs.
• Procurement confidence – Widely used on API 670 protection systems; documentation and support are straightforward to obtain.

Installation & Maintenance

• Mounting – Install in a rigid threaded boss; use the jam nut and set a nominal 1.0 mm (40 mil) gap unless your monitor or procedure specifies differently.
• Cabinet & routing – Place the Proximitor in a ventilated cabinet or field enclosure; route probe and extension cables away from high-voltage runs to reduce noise.
• Wiring – Maintain system-length matching (probe + extension cable + Proximitor). Mixing lengths can affect calibration.
• Safety – De-energize associated monitors before connecting/disconnecting; confirm hazardous-area approvals if installed in classified zones (this “-00” is typically general-purpose).
• Routine care – Periodically verify gap, clean the probe face if fouled with oil or debris, and check cable armor integrity. Firmware updates apply to the monitor, not the passive probe.
• Calibration checks – Spot-check output on a micrometer rig or with a rotor kit annually, especially after outages or probe replacements.

Quality & Certifications

• CE marking and RoHS conformity typically available for 3300 XL probes
• UL/CSA and ATEX/IECEx options are available on certain variants; the “-00” code generally denotes non-hazardous approvals
• Manufacturer warranty: 365 days (backed by our sales guarantee terms above)

Commonly Paired Components

• Bently Nevada 3300 XL Proximitor Sensor (matching the system length and probe type)
• Bently Nevada 3300 XL Extension Cable (typically 330130 series for 8 mm probes; length selected to achieve 5 m / 7 m / 9 m systems)
• API 670-compatible protection monitors (e.g., radial vibration, thrust position)

One thing I appreciate is how forgiving this probe is in day-to-day maintenance—gap checks are quick, and the signal is predictable when the system length is correct. If you’d like, share your existing system length and thread requirement, and I’ll confirm that this 330103-00-05-05-02-00 configuration matches your current spares strategy.