Bently Nevada 330851‑02‑000‑060‑50‑01‑CN 3300 XL 25mm Eddy‑Current Proximity Probe

Product Description

330851‑02‑000‑060‑50‑01‑CN is a 3300 XL series 25 mm non‑contact eddy‑current proximity probe manufactured by Bently Nevada. It is part of the 3300‑XL‑25 transducer system, paired with matching extension cable and proximitor sensor. This M30×2 threaded probe features 60 mm case length, 5‑meter armored cable, CN connector version. It provides 0.787 V/mm (20 mV/mil) output and wide linear measuring range, specially designed for differential expansion, shaft displacement and vibration measurement on large rotating machinery under high‑temperature and heavy‑vibration industrial environments.

Product Features

• 25 mm eddy‑current proximity probe, linear measurement range up to 12.7 mm (500 mils) for large gap variation measurement
• Sensitivity: 0.787 V/mm (20 mV/mil), compatible with 3300 XL 25 mm proximitor and matched extension cable
• M30×2 mounting thread, 60 mm probe case, 5‑meter stainless‑steel armored cable, CN connector interface
• Operating temperature range: ‑35 °C ~ +200 °C, short‑term peak temperature resistance up to 250 °C
• Full mechanical and electrical interchangeability within 3300‑XL‑25 system without field recalibration
• Non‑contact measurement, no mechanical wear on rotating shaft surface
• Robust armored cable resists abrasion, oil contamination and mechanical pulling stress in turbine cabinets
• Designed for machinery protection system, outputs gap‑proportional DC voltage signal for monitoring rack input
• NIST‑traceable factory calibration, suitable for safety‑critical rotating equipment protection applications

Application Scenarios

• Differential expansion measurement for large steam turbine‑generator sets in power plants
• Shaft displacement, axial position and vibration monitoring for heavy‑duty centrifugal compressors
• Condition monitoring for gas turbines, large industrial turbo‑machinery in petrochemical plants
• Rotating machinery protection system interfaced with Bently Nevada 3500 monitoring rack
• High‑temperature machinery compartments where long‑range non‑contact displacement measurement is required
• Power generation, oil & gas and process industry critical rotating equipment online health monitoring

Common Problems & Troubleshooting

• No valid gap voltage output: Check probe‑extension‑cable‑proximitor full matching set; inspect CN connector pin condition for dirt, oxidation or loose locking; verify proximitor power supply.
• Signal drift or unstable reading: Check probe mounting gap; inspect cable squeezing, crushing or sharp bending; avoid high‑power cable parallel routing; check local high‑temperature over‑range condition.
• Low / abnormal gap voltage value: Verify target shaft material is ferrous metal; check probe tip surface contamination by oil, dust or metal debris; confirm correct mechanical installation gap.
• Monitoring rack reports probe fault status: Perform loop test to distinguish probe, cable or proximitor failure; check armored cable inner conductor open‑circuit or short‑circuit failure.
• Measurement error after replacement: Ensure complete matched 3300‑XL‑25 series set; do not mix‑use 8 mm or other size probe accessories; confirm factory calibration version consistency.
• Mechanical damage: Inspect probe‑tip collision scratch after unit overhaul; check armored‑cable fatigue crack under long‑term vibration; replace physically damaged probe assembly.