330707-00-20-90-01-05 Bently Nevada Proximity 11mm 3300 XL Series

Engineering Overview: High-Precision Displacement Sensing

The 330707-00-20-90-01-05 is an industry-standard 3300 XL 11 mm Proximity Probe by Bently Nevada. Designed for precise non-contact measurement of shaft displacement and vibration, this 11mm transducer offers an extended linear range compared to 8mm counterparts. Housed in a durable 304 stainless steel casing with a PPS tip, it provides the structural integrity required for high-speed machinery monitoring in aggressive environments.

Configuration Breakdown

The following table summarizes the technical configuration for the 330707-00-20-90-01-05:

• Model: 330707 (3300 XL 11mm Proximity Probe)
• Unthreaded Length (00): 0 in
• Overall Case Length (20): 2.0 in
• Total Length (90): 9.0 meters (29.5 ft)
• Connector (01): Miniature coaxial ClickLoc with protector
• Agency Approvals (05): Multiple Approvals

Global PLC Spare HUB’s Insight

The 330707-00-20-90-01-05 is engineered for larger bearing clearances where the standard 8mm probe's linear range might be insufficient. Our experience shows that the ClickLoc™ connector significantly reduces installation time and eliminates the risk of "finger-tight" connections vibrating loose over time. This probe is the primary choice for large-frame utility turbines where precise gap monitoring is non-negotiable for machine protection.

Industrial Applications, Diagnostics & Logistics

• Suitable Equipment: Hydro-electric generators, large centrifugal compressors, and multi-stage axial turbines.
• Diagnostic Capability: The 11mm probe tip provides a broader linear range, allowing for the detection of deeper shaft motion profiles and transient thermal shifts that smaller probes might miss.
• Warranty: 12-month factory-standard quality assurance.
• Shipping: Expedited global transit via FedEx, UPS, or DHL; 24–48 hour dispatch.

Model Comparison & Technical Advice

Technical comparison for your selection process:

• 330707-00-20-90-01-05 (Current Selection): Standard configuration with ClickLoc connector and 9m cable.
• 330707-00-20-90-11-05: Identical physical length, but utilizes a different connector/cable termination configuration.

Technical Suggestion: When replacing probes, always verify the probe tip material compatibility with your existing extension cable series. The 330707-00-20-90-01-05 is optimized for high-reliability systems; if you are retrofitting, ensure your extension cable matches the 01 ClickLoc interface to avoid signal mismatch.

Expert Frequently Asked Questions

Why is the 11mm probe size chosen over the standard 8mm size?
The 11mm tip offers a wider linear range (up to 4mm). This is essential for machines with larger bearing clearances or shafts that undergo significant thermal expansion during start-up.

Does the Viton® O-ring require special lubrication during installation?
It is recommended to use a thin film of clean machine oil or a compatible lubricant to ensure the O-ring seats correctly without twisting, which could jeopardize the pressure seal.

What is the maximum torque allowed for the 5/8-18 probe case threads?
The maximum rated torque is 45.2 N•m (400 in•lb). We strongly recommend using the recommended 15.2 N•m (133 in•lb) to ensure the probe remains removable without damaging the casing threads.

Can the probe cable be shortened in the field to match the exact distance?
No. The 3300 XL system is "calibrated" as a matched set (probe, extension cable, and proximity driver). Shortening the cable will alter the impedance, leading to significant signal errors.

How does the "ClickLoc" connector improve system reliability?
ClickLoc connectors feature a positive-locking mechanism that prevents vibration-induced loosening. It eliminates the need for safety wire or electrical tape, which were common points of failure in older systems.

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