Bently Nevada 330876-03-50-00-00 50 mm Proximity Probe – Long‑reach non-contact sensing for critical rotating machinery

The Bently Nevada 330876-03-50-00-00 is a 50 mm proximity probe designed for reliable, non-contact measurement of shaft vibration and position on turbines, compressors, pumps, and other high-value assets. From my experience, this 50 mm body format is especially useful when you need a recessed or protected install while keeping a clean line of sight to the target. It connects to a matching Bently Nevada Proximitor sensor to deliver both gap and dynamic vibration signals used in API 670–style protection and condition monitoring systems.

Company’s Order Placement Process and Guarantees

Key Features

• 50 mm probe body – Gives extra reach for recessed installations or thicker machine casings without sacrificing signal quality.
• Non-contact eddy-current measurement – Stable, repeatable readings on conductive targets (typically steel) for both gap and dynamic vibration.
• Engineered for harsh environments – Robust probe construction and low-noise coaxial cable routing help maintain signal integrity near high-speed rotating parts.
• System compatibility – Works with matching Bently Nevada Proximitor sensors and extension cables in the 3300/3300 XL family, enabling simple drop-in replacements in many cases.
• API 670–style applications – Commonly used for radial vibration, axial position, and phase reference when configured with appropriate targets and drivers.
• Procurement-friendly – Standard dash-code configuration for cable/threads; you might notice that it streamlines maintenance spares stocking across multiple assets.

Technical Specifications

Application Fields

This model is used across oil & gas, petrochemical, power generation, pulp & paper, marine, and metal processing. Typical use cases include:

• Radial vibration on journal bearings for compressors and steam turbines
• Axial position and thrust clearance on pumps and gearboxes
• Phase/once-per-turn reference when used with appropriate target wheels and drivers
• Slow-roll and shaft centerline plots in machinery monitoring systems

Advantages & Value

• Reliability – Built for continuous-duty operation around heat, vibration, and oil mist; in many cases it outlasts generic probes.
• Compatibility – Seamless with Bently Nevada Proximitor sensors and monitors, which reduces setup time and calibration headaches.
• Cost Savings – The 50 mm body can avoid custom brackets or deep machining, which typically lowers modification costs during retrofits.
• Technical Support – We assist with dash-code verification and replacement matching so your spares align with plant standards.

A maintenance lead at a gas plant told us this 50 mm version “seems to be the easiest drop‑in when casing thickness varies between machines,” especially where clearance is tight and cable routing needs to stay protected.

Installation & Maintenance

• Mounting – Use a proper sleeve or threaded bracket; set the cold gap per the Proximitor calibration (typically checked by DC output voltage).
• Cabinet & Wiring – Route the coaxial cable away from high-voltage lines; maintain bend radius and strain relief; ensure monitor cabinet is ventilated to avoid heat soak.
• Safety – Lock out and tag out rotating equipment; verify the probe isn’t touched by the shaft at thermal growth or runout peaks.
• Routine Checks – Inspect probe tip cleanliness, verify gap voltage trends, and confirm secure connectors during shutdowns.
• Calibration – System calibration is determined by the Proximitor and monitor; document any changes after probe replacement to keep API 670 compliance.

Quality & Certifications

• Manufactured under ISO 9001–style quality systems
• Typically CE and RoHS compliant for industrial use
• Warranty: 365 days