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Help CenterBently Nevada 330851-04-000-023-10-01-05 Proximitor Sensor – 8 mm Proximity Measurement for Critical Rotating Equipment
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The Bently Nevada 330851-04-000-023-10-01-05 is a 3300 XL Proximitor Sensor designed to work with 8 mm eddy-current proximity probes for precise shaft vibration and axial position monitoring. It’s the workhorse you pair with 3500 and 1900 series monitors when you need stable gap voltage, dependable –200 mV/mil output, and long, trouble-free service in harsh environments. From my experience, it’s typically chosen for turbines, compressors, large pumps, and gearboxes where reliability isn’t optional.
3300 XL 8 mm compatibility – Pairs with 8 mm proximity probes and extension cables for standard –200 mV/mil (7.87 mV/μm) transducer systems.
Stable output and linearity – Delivers a linear range typically up to 2 mm (80 mil), helping the monitor calculate both gap and dynamic vibration accurately.
Rugged for industrial duty – Good immunity to EMI/RFI and temperature swings; suited for continuous operation in machinery protection.
Monitor-ready power – Powered directly from Bently Nevada monitors (typically –24 Vdc nominal), no separate power supply to manage.
Option-coded flexibility – The option string (…-04-000-023-10-01-05) defines approvals and build details, so you can match plant standards without redesign.
Drop-in serviceability – Field-proven footprint and wiring scheme allow quick swap-outs during outages, minimizing machine downtime.
| Brand / Model | Bently Nevada 330851-04-000-023-10-01-05 |
| Sensor type | 3300 XL Proximitor Sensor for 8 mm proximity probe systems |
| Sensitivity | –200 mV/mil (7.87 mV/μm) nominal |
| Linear range | Typically 2 mm (80 mil) for 8 mm systems |
| Power requirements | Supplied by monitor, typically –24 Vdc nominal (approx. 18–27 Vdc) |
| Operating temperature | Typically –35 °C to +100 °C (application dependent) |
| Signal I/O | Input: 8 mm probe via extension cable; Output: gap voltage + dynamic vibration signal to monitor |
| Communication interfaces | None (analog transducer output to monitoring system) |
| Compatible monitors | Bently Nevada 3500 series, 1900 series, and other 3300 XL-compatible monitors |
| Installation method | Panel/surface mounting with screws; DIN-rail adapter available in many cases |
You’ll typically find the 330851 in continuous machinery protection on:
Steam and gas turbines – Shaft vibration and axial position measurement for trip and alarm logic.
Centrifugal compressors – Close coupling with dry-gas seals and critical bearings where linear accuracy matters.
Large motors and pumps – Early detection of rotor rubs or misalignment through reliable gap and dynamic signals.
Gearboxes and fans – Trending of vibration to support predictive maintenance in mixed-speed machines.
Proven reliability – The 3300 XL platform is widely adopted; parts are consistent and, in most cases, easy to source or replace during turnarounds.
Compatibility reduces risk – Works with established Bently Nevada monitors, wiring conventions, and probe/extension cable kits.
Lower lifecycle cost – Stable calibration and long service intervals mean fewer reworks and less time in the cabinet.
Standards and approvals – Option codes typically cover factory approvals and hazardous area needs, so procurement stays aligned with site standards.
A maintenance lead shared with us that after moving to a fresh 330851 unit, the bias (gap) voltage stabilized immediately and vibration trending on the 3500 returned to expected values without reconfiguring channel parameters—exactly what you want in a short outage window.
Installation & MaintenanceCabinet and mounting – Install in a clean, ventilated enclosure (IP/NEMA-rated to your site standard). Secure the Proximitor on a rigid surface; avoid high-vibration mounting plates.
Wiring practice – Use the matched 8 mm probe and extension cable set. Keep cable runs away from high-voltage lines, maintain bend radius, and verify shield terminations per Bently Nevada guidelines.
Initial checks – Set probe gap within the recommended midrange; confirm bias voltage at the monitor and check dynamic signal with the machine coasting down.
Routine care – Periodically inspect connectors for corrosion, confirm tightness of terminal screws, and validate channel scale (–200 mV/mil). No firmware applies to the sensor; if used with digital monitors, keep monitor firmware current.
Safety – De-energize the monitor channel before servicing. In hazardous areas, follow your site’s hot work permits and intrinsic safety practices aligned to the installed approval options.
CE compliant; UL/cUL and CSA recognition typically available per option code.
ATEX/IECEx hazardous area approvals available on selected configurations.
Manufactured under ISO-certified quality systems by the Bently Nevada brand.
Standard manufacturer’s warranty: typically 1 year (verify per shipment/region).
If you’re standardizing spares, confirm the option string (…-04-000-023-10-01-05) against your installed probes, extension cables, and site approvals. It seems to be the quickest way to avoid mix-and-match headaches during a shutdown.
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