BENTLY NEVADA 330500-02-CN – Proximitor sensor for shaft vibration and position monitoring

The BENTLY NEVADA 330500-02-CN is a Proximitor sensor used with 3300-series eddy-current probes to measure radial shaft vibration, shaft position (gap), and axial thrust position on critical rotating equipment. From my experience, plants choose this model when they want a dependable, drop-in proximity system that plays nicely with 3500 rack monitors and similar protection systems. You might notice that it keeps the familiar 200 mV/mil (≈7.87 mV/µm) scaling, making it straightforward to retrofit or expand existing 3300 XL installations.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week if 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

• Proven proximity measurement – Eddy-current system typically scaled at 200 mV/mil (≈7.87 mV/µm) for vibration and position monitoring.
• Compatible with 3300 XL probes – Works with 5 mm and 8 mm probe systems when matched with the proper extension cable lengths.
• Reliable gap and vibration outputs – Delivers a clean analog signal to protection and condition monitoring systems like the 3500 series racks.
• Industrial-grade build – Designed for continuous service near rotating machinery; good electrical shielding and grounding provisions.
• Flexible installation – Typically panel/surface mounted close to the machine to minimize noise and cable runs.

Technical Specifications

Application Fields

Typically used on turbines, compressors, pumps, fans, blowers, gearboxes, and generators. A common setup is radial probes in two orthogonal directions for shaft vibration, plus a thrust probe on the thrust bearing for axial position. In many cases, plants retrofit this model to standardize on a single scale factor across lines and simplify spares.

Advantages & Value

• Compatibility – Works seamlessly with Bently Nevada 3500 series monitors and existing 3300 XL probe systems.
• Reduced downtime risk – Stable scaling helps avoid reconfiguration errors during swaps or expansions.
• Lifecycle confidence – Broad installed base; spares and support are typically straightforward to source.
• Procurement-friendly – Clear specifications, standard approvals, and a one-year warranty simplify vendor approval.

One thing I appreciate is how forgiving the signal is when the module is mounted close to the machine. A maintenance lead at a steel mill told us they cut nuisance alarms by relocating the Proximitor from a remote cabinet to a bracket near the bearing housing—same hardware, just better practice.

Installation & Maintenance

• Mounting – Install the Proximitor in a clean, dry location as close to the probe as practical to minimize noise pickup. Use shielded, correctly grounded cabling.
• Cabinet standards – For centralized panels, use well-ventilated enclosures; maintain separation from high-voltage power lines and VFD outputs.
• Wiring – Maintain exact system length (probe + extension + Proximitor) per 3300 XL configuration; avoid tight bends and mechanical stress on coax.
• Safety – De-energize associated monitors before wiring changes; follow local hazardous-area practices if applicable.
• Routine checks – Verify gap voltage at the monitor (it should sit in the mid-range), inspect cable insulation, clean connectors, and document any drift.
• Calibration & updates – After probe replacement or machine work, re-verify scale/phase on the monitor channel; apply firmware updates to the rack system when recommended.

Quality & Certifications

• CE and RoHS compliance; hazardous area approvals (e.g., ATEX/IECEx/CSA) are typically available by option
• Manufacturing and quality processes aligned with ISO-based systems from the OEM
• Standard manufacturer’s warranty coverage; 365-day warranty provided on supply

Compatible Accessories & Related Models

• 3300/3300 XL Probes (5 mm / 8 mm)
• Extension Cables matched to the selected probe and system length
• 3500 Series Monitoring Racks for protection and condition monitoring
• Mounting brackets and protective hardware for machine-side installation