Bently Nevada 330850-50-00 Proximity Extension Cable – Reliable link for 3300 XL vibration monitoring

The Bently Nevada 330850-50-00 is a factory-configured proximity extension cable, typically used to connect a 3300 XL proximity probe to its Proximitor sensor. It’s the piece that quietly ensures you get stable, repeatable displacement signals from your rotating assets—compressors, turbines, critical fans—without fuss. One thing I appreciate is how it drops into existing 3300 XL chains with minimal rework, which saves time during turnarounds.

Company’s Order Placement Process and Guarantees

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

Key Features

• Purpose-built for 3300 XL systems – In most cases, mates with 3300 XL 5 mm or 8 mm probes and their Proximitor sensors for consistent eddy-current measurements.
• Stable signal path – Coaxial construction helps maintain low-noise transmission, supporting reliable shaft vibration and position readings.
• Factory length configuration (5.0 m) – The -50-00 variant is typically 5.0 meters, simplifying spares planning and one-for-one replacements.
• Rugged connectors – Designed for secure locking and quick service; you might notice fewer intermittent faults after proper routing and strain relief.
• Harsh-environment tolerance – From my experience, these cables handle plant conditions well when routed correctly away from high EMI and heat sources.

Technical Specifications

Application Fields

Commonly used in machinery protection and condition monitoring across:

• Steam and gas turbines (bearing and shaft vibration)
• Compressors and expanders in oil & gas and petrochemical plants
• Large motors, generators, blowers, and vertical pumps
• Balance-of-plant equipment where 3300 XL proximity probes are installed

A maintenance lead told us they swapped this cable during a planned outage and saw the shaft runout values stabilize immediately—no need to rewire the cabinet, which seems to be a common benefit with the 3300 XL family.

Advantages & Value

• Reliability – Consistent shielding and connector integrity reduce noise pickup and intermittent trips.
• Compatibility – Typically works seamlessly with existing Bently Nevada 3300 XL probes and Proximitor sensors, minimizing engineering changes.
• Lower lifecycle cost – Using the right length and series avoids improvised splices and rework, which in many cases lowers downtime risk.
• Supportable spares strategy – Standard lengths like 5.0 m keep inventory simple for multi-unit plants.

Installation & Maintenance

• Environment – Route in grounded metallic conduit or tray where possible. Keep clear of high-voltage lines and VFD outputs to minimize EMI.
• Cabinet & wiring – Land the cable cleanly to the Proximitor sensor; maintain proper shield continuity. Avoid tight bends; follow a gentle minimum bend radius.
• Connections – Ensure connectors are fully seated and locked. From my experience, most drift issues trace back to connectors under vibration.
• Routine checks – Inspect for abrasion and compression points during shutdowns. Do not field-splice; replace as an assembly if damaged.
• Calibration – The cable itself doesn’t need calibration, but system verification (probe-gap and linearity) after replacement is a good practice.

Quality & Certifications

• Manufacturer quality systems typically aligned with ISO
• CE marking and RoHS compliance are common for this series
• Warranty provided: 365 days (our service policy)

Related Components (often paired)

• Bently Nevada 330130 series proximity probes (5 mm / 8 mm)
• Bently Nevada 3300 XL Proximitor sensors
• Mounting brackets and probe housings for confined installations

If you’re standardizing spares, you might also consider keeping a matching probe (same tip diameter) and a Proximitor sensor on the shelf. That way, you can swap any element in the chain and re-verify the gap quickly.