Bently Nevada 330108-91-05 – 3300 XL 8 mm Proximity Probe for Precise Shaft Vibration and Position

The Bently Nevada 330108-91-05 is part of the 3300 XL proximity measurement family, designed for critical rotating machinery where reliable shaft vibration, thrust position, and clearance monitoring really matter. From my experience, this probe is typically paired with a 3300 XL Proximitor Sensor (such as 330180) to deliver stable eddy-current displacement measurements with the classic 200 mV/mil nominal sensitivity many plants standardize on. You might notice that the -05 suffix indicates a 5 m integral cable, while the -91 option usually relates to the probe’s connector/armor configuration. It seems to be a popular fit for turbines, compressors, large pumps, and gearboxes that run hot, fast, and continuously.

Our Order Placement Process & Guarantees

• Warranty: 365 days
• Delivery: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• 3300 XL 8 mm probe head – Built for eddy-current displacement measurement on steel targets; widely used for shaft vibration and axial/thrust position.
• 5 m integral cable (suffix -05) – Helps reach junction boxes or proximitor locations with fewer splices, improving signal integrity in many cases.
• Pairs with 3300 XL Proximitor Sensors – Commonly used with Bently Nevada 330180; delivers nominal 200 mV/mil system sensitivity and a typical linear range around 2 mm (80 mil) when configured correctly.
• High-temperature capability – Probe and cable assemblies in this family are typically rated for elevated temperatures; well-suited for steam turbines and hot compressor bearings.
• Rugged, threaded mounting – Threaded body with jam nut allows secure installation and repeatable gap setting in harsh environments.
• Installed base compatibility – Designed to integrate with the 3300 XL ecosystem (proximitor and extension cables), simplifying replacements and spares strategies.
• Hazardous area variants available – ATEX/IECEx options are commonly available across the 3300 XL line (verify the exact approvals for your part code).

Technical Specifications

Application Fields

This probe is typically deployed on:

• Steam and gas turbines (radial vibration, thrust position)
• Compressors and expanders (bearing vibration, rotor clearance)
• Pumps and fans (overall vibration, shaft orbit analysis)
• Gearboxes and generators (shaft displacement and runout)
• High-speed spindles and specialty rotating assets

A maintenance lead on a 20 MW compressor line mentioned that switching to a 330108 probe with a 330180 proximitor stabilized their gap readings through seasonal temperature swings—small detail, big confidence boost during startups.

Advantages & Value

• Reliability under harsh conditions – The 3300 XL architecture is well proven on high-temperature, high-vibration machinery.
• Installed-base compatibility – Works within the Bently Nevada 3300 XL ecosystem, easing replacements and mixed-fleet standardization.
• Lifecycle savings – Fewer nuisance trips and stable calibration typically reduce unplanned downtime and callouts.
• Technical support – We can help match probe, extension cable, and proximitor to your required system length and targets.

Installation & Maintenance

• Environment & cabinet – Mount the Proximitor in a clean, ventilated enclosure; keep probe cable routing away from high-voltage lines where possible.
• Mechanical mounting – Install the probe with the supplied jam nut; observe the recommended minimum bend radius for the cable and avoid sharp edges.
• Gap setting – Set the nominal gap (often ~1.0 mm / 40 mil) with feeler gauges; verify linear range with your proximitor per commissioning procedures.
• Wiring – Use matched 3300 XL extension cables (e.g., 330130) to achieve the intended system length; maintain connector integrity and proper shielding.
• Routine checks – Periodically confirm gap, inspect cable armor/strain relief, clean probe tip if fouling is suspected, and document any rubs or runout changes.
• Spare strategy – Keep a spare probe and extension cable with the same option codes; it saves time during shutdowns.

Quality & Certifications

• Certifications: CE and RoHS compliance are typical for the 3300 XL family; ATEX/IECEx hazardous area approvals are available on specified options.
• Manufacturing system: Produced under ISO 9001 quality systems.
• Warranty: 365 days from delivery.

Related Components (for a complete chain)

• 330180 – 3300 XL Proximitor Sensor (pairs with the 330108 probe)
• 330130 – 3300 XL extension cable (select length to match your required system length)

Note: Exact thread type, armor, and approvals can vary by the -91 option code and regional availability. If you share your existing part codes or required system length, we’ll double-check compatibility before shipping.