Description

1. Bently Nevada 330876-03-50-00-00 | 1.99″ Smooth Stainless Housing Probe for Turbine Shaft Monitoring

Product Core Brief

• Model: 330876-03-50-00-00
• Brand: Bently Nevada
• Series: 3300 XL 50 mm Proximity Transducer System
• Core Function: Non-contact eddy current measurement of shaft vibration and axial position
• Type: 50 mm proximity probe complete assembly
• Key Specs: 5.0 m total cable, side exit smooth housing, high-temperature FluidLoc triaxial cable
• Condition: New Surplus, fully bench tested before shipment ⚠️ Original production phase-out, limited available stock

Product Introduction

Rotating equipment protection relies on stable gap signal collection, and this 330876-03-50-00-00 forms the sensing front end of the 3300 XL 50mm eddy current system. It works with matched 5-meter Proximitor sensor to convert shaft clearance changes into continuous voltage signals for 3500 monitoring racks.

The -03 suffix stands for smooth 1.99 inch stainless steel housing with side cable exit, a practical layout for tight bearing housings with limited straight outlet space. The built-in FluidLoc cable blocks oil and fluid penetration along the cable path, a common pain point on steam turbine bearing compartments. Field data shows stable linear performance within -35 °C to 200 °C continuous operating range, widely adopted on large compressors and turbo-generator sets.

Key Technical Specifications

Bently Nevada 330876-03-50-00-00

Installation & Configuration Guide

Phase 1: Pre-Installation (Estimated 12 minutes)

⚠️ Safety Reminders:

1. Coordinate maintenance window with operation team; lock out rotating machinery.
2. Confirm no hot surfaces near installation positions to avoid cable damage.
3. Strict ESD protection applies to all probe and connector handling.

Tools you need:

• Anti-static wrist strap + anti-static mat
• Calibrated torque wrench for probe mounting
• Mobile phone for photographing original wiring and gap dimensions
• Non-conductive feeler gauges for gap adjustment
• Lint-free cloth for connector cleaning

Backup work:

• Record original probe gap voltage value before removal.
• Photograph cable routing and connector assembly status.

Phase 2: Remove Original Probe (Estimated 15 minutes)

1. Disconnect the triaxial ClickLoc connector between probe and extension cable. Do not twist cable during separation.
2. Loosen the probe mounting nut slowly, support the probe body to avoid rotation.
3. Pull the probe out from the mounting boss. Keep cable free from sharp edges.
4. Inspect the triaxial connector pins; blow away oil contamination with dry clean air.

Important note: Do not bend the cable sharply at connector roots. Permanent kinks degrade signal linearity.

Phase 3: Install New 330876-03-50-00-00 (Estimated 18 minutes)

1. Wear anti-static gear before opening anti-static packaging.
2. Verify complete part number: 330876-03-50-00-00. Mismatched length variants cannot match the Proximitor circuit.
3. Route the cable along pre-planned paths, maintain bend radius above 25 mm, avoid crossing high voltage power cables.
4. Thread probe into mounting boss, set target gap according to site drawing.
5. Tighten lock nut with specified torque; over-tightening may deform probe housing.
6. Connect triaxial ClickLoc connector, push firmly until fully engaged.

Pre-power checklist: [ ] Cable routing without sharp bends or crushing [ ] Probe gap adjusted to design value [ ] Connector fully locked and protected [ ] No mechanical contact between probe tip and rotating shaft

Phase 4: Power-On & Function Test (Estimated 22 minutes)

Pre-power inspection: Visually confirm probe tip maintains safe clearance from shaft surface.

Power-up sequence:

1. Energize the Proximitor sensor and 3500 monitoring rack.
2. Read raw gap voltage from monitoring channel and compare with calculated theoretical value.
3. Check linearity range; confirm gap stays within probe linear interval during full shaft thermal expansion.
4. Run static shaft test first, then perform slow crank turning test to verify continuous signal output.
5. Maintain monitoring for over 30 minutes, check no signal drift caused by temperature rise.

Troubleshooting hints:

• Unstable gap voltage → Check connector contamination or cable crushing
• No signal output → Inspect triaxial connector full engagement
• Deviated linearity → Confirm matching 5m Proximitor sensor variant

Frequently Asked Questions (FAQ)

1. Can I pair this 5-meter probe with a 9-meter Proximitor sensor? Not allowed. The total cable length must match the Proximitor specification. Mixing length combinations breaks eddy current circuit tuning and causes severe linearity error.
2. What benefit does FluidLoc cable bring for turbine bearing installation? The FluidLoc structure stops bearing oil creeping along the cable sheath into the connector. Many field failures come from oil contamination inside triaxial joints; this cable minimizes such risks.
3. Is the side exit housing interchangeable with straight exit probe of the same series? Electrically the sensing performance matches. Mechanical installation differs. Confirm mounting boss geometry before direct replacement; side exit requires extra lateral clearance.
4. How much gap should I set during commissioning? Follow equipment OEM specifications. Common practice sets mid-range gap voltage as the static operating point. Always leave enough margin for shaft thermal growth.
5. Does this probe support Keyphasor speed measurement? Yes. It can be configured for Keyphasor pickup when facing a shaft notch or target, alongside vibration and position monitoring tasks.
6. Can I repair the probe if the cable gets damaged? Field splicing of triaxial cable ruins impedance characteristics. Damaged probes require full replacement; repair is not supported by official specifications.
7. What warranty coverage is available for this proximity probe? We provide 12-month warranty after shipment. Every unit undergoes gap voltage linearity testing before delivery. Test records can be provided upon request.