Bently Nevada 330709-000-050-10-02-00 | 3300 XL 11 mm Proximity Probe for Harsh Conditions

The Bently Nevada 3300 XL 11 mm proximity probe is built for tough machinery environments—hot oil, vibration, and tight spaces where you still need clean, reliable shaft vibration and position data. From my experience, the 11 mm tip gives you a longer linear range and a bit more mechanical robustness than the 8 mm system, which is why it’s typically chosen for large turbines, compressors, and heavy-duty pumps. The model shown here, 330709-000-050-10-02-00, appears to be a 5.0 m integral-cable probe variant designed to pair with 3300 XL Proximitor sensors and matching extension cables for a 5/7/9 m system length.

Company’s Order Placement Process and Guarantees

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

Key Features

• 11 mm sensing tip – Extended linear range, typically up to 4 mm (160 mil), ideal for large shaft diameters and heavy rotors.
• Harsh-environment design – Robust probe construction with sealed coax and chemically resistant jacket; holds up in oil and contaminants.
• High temperature capability – Probe/head and integral cable typically rated to -51 to +177 °C, which suits hot bearing housings.
• Stable, industry-standard scaling – When paired with a 3300 XL Proximitor sensor, you get the familiar 200 mV/mil (≈7.87 mV/µm) output used in most API 670 systems.
• System-length matched – Works as part of 5 m, 7 m, or 9 m systems; components must be matched for accuracy (probe + extension cable + Proximitor).
• Flexible mounting – Installs with threaded sleeves and jam nuts; options exist for forward or reverse-mount setups to suit restricted spaces.
• Excellent immunity to electrical noise – Coaxial cabling and sensor design help maintain a clean signal close to high-current equipment.

Technical Specifications

Application Fields

You’ll typically see the 11 mm probe on large rotating assets where extra linear range and ruggedness pay off:

• Steam/gas turbines and large compressors (radial vibration, axial position, and thrust measurements)
• High-pressure, hot-oil pumps and API 610 machinery in refineries and petrochemical plants
• Gearboxes and paper mill rolls where shaft runout and thermal growth need stable tracking
• Balance-of-plant fans, blowers, and motors in dusty or oil-laden environments

A maintenance supervisor told us, “We swapped to the 11 mm system on two hot-end compressors. The signal stayed clean past the shutdown temperatures where our previous probes drifted.”

Advantages & Value

• Reliability in harsh service – Fewer false alarms and less drift reduces unnecessary stops.
• Compatibility – Works with 3300 XL Proximitor and standard Bently Nevada monitoring racks (e.g., 3500/3701) when system length is matched.
• Lifecycle cost savings – Durable probe design means longer service intervals, typically fewer maintenance callouts.
• Technical support – We can help validate system length, mounting hardware selection, and gap setup to speed commissioning.

Installation & Maintenance

• Cabinet/monitor environment – Install Proximitor and monitor in ventilated panels; keep ambient within the monitor’s specified range.
• Wiring and routing – Use only matched 3300 XL extension cables; route coax away from VFDs and high-current runs; maintain bend radius.
• Mounting – Use the correct threaded sleeve; tighten jam nut to spec; set nominal gap (you’ll typically target ~2 mm with the 11 mm system, then verify bias voltage at the monitor).
• Safety – Lockout/tagout rotating equipment; confirm tip is perpendicular to the target surface; avoid metallic debris on the tip.
• Routine checks – Periodically verify DC bias/gap voltage and sensitivity; clean the probe tip if oil varnish builds up; update monitor firmware per OEM guidance.

Quality & Certifications

• Manufacturer certifications typically include CE and RoHS; production under ISO 9001 quality systems
• Meets common API 670 practices when used within a complete 3300 XL system
• Warranty: 365 days from our side

Notes on Compatible Components

• 3300 XL Proximitor sensor (11 mm system) – Provides drive/signal conditioning and the 200 mV/mil output to your monitor.
• 3300 XL extension cables (5 m / 7 m / 9 m) – Match length with the probe and Proximitor; mixing lengths can affect calibration.
• Mounting hardware – Threaded sleeves, reverse-mount adaptors, and armor options are available for high-abrasion routes.