Bently Nevada 330876-01-90-00-RU 3300 XL 50mm Steam Turbine Probe

Product Overview

The Bently Nevada 330876-01-90-00-RU is a heavy-duty proximity probe built for extreme environments. It belongs to the world-renowned 3300 XL 50 mm series. This sensor excels in monitoring large scale industrial machinery. Engineers rely on it for critical vibration and position measurements. 

Global PLC Spare HUB's Insight

Our engineering team identifies the 3300 XL 50 mm probe as a premier solution for high-temperature turbine areas. The differential expansion (DE) zone of a steam turbine exposes sensors to punishing heat and moisture. Standard proximity probes often fail under these conditions. This specific module solves that problem with advanced specialized sealing. The FluidLoc cable prevents steam migration through the internal leads. It ensures long term calibration stability. It operates perfectly alongside standard turbine supervisory instrumentation (TSI) systems.

Target Equipment Compatibility

• Large-scale steam turbines and high-pressure gas turbines
• Utility turboalternators and generator sets
• High-power axial compressors and industrial process air blowers
• Heavy-duty boiler feed pumps and multi-stage fluid pumps

Technical Specifications

• Brand: Bently Nevada
• Model: 330876-01-90-00-RU
• Series: 3300 XL 50 mm Proximity Transducer System
• Measurement Target: Differential Expansion (DE), axial position, and dynamic vibration
• Linear Range: Greater measurement range compared to standard 8mm or 11mm probe systems
• DC Resistance: 8.9 ± 1.1 ohms from center conductor to coaxial outer conductor
• Operating Temperature: -35°C to +200°C (-31°F to +392°F) continuous rating
• Short-Term Temperature: Up to +250°C (+482°F) for durations under 24 hours
• Tip Material: High-performance Polyphenylene Sulfide (PPS)
• Case Material: AISI 304 Stainless Steel (SST)
• Cable Construction: 75 ohm triaxial, perfluoroalkoxyethylene (PFA) insulated FluidLoc cable
• Environmental Protection: Dual front and rear internal seals with hermetic moisture barriers
• Interference Resistance: Triaxial shielding provides excellent immunity against electromagnetic interference (EMI)

Configuration Breakdown

• Base Model: 330876 - 3300 XL 50 mm Proximity Probe
• Probe Case Type Option: -01
  • Thread Style: 1/2-20 English thread
  • Exit Angle: Straight exit configuration
  • Maximum Thread Engagement: 0.750 inches
• Total Length Option: -90
  • Cable Length: 9.0 meters (29.5 feet)
• Armor Option: -00
  • Cable Type: High Temperature FluidLoc unarmored cable
• Agency Approval Option: -RU
  • Certification: Country-specific safety and environmental approvals

Diagnostic and Condition Monitoring Capabilities

• Measures relative thermal growth between turbine rotors and casings accurately
• Detects catastrophic rotor unbalance and severe shaft misalignment hazards
• Provides continuous peak-to-peak displacement values to machinery protection systems
• Prevents false trips through stable electrical output under high thermal stress

Installation Guide

• Verify the thread type matches the machine housing before inserting the probe
• Ensure the maximum thread engagement depth stays within 0.750 inches
• Utilize the predrilled locknut safety wire holes to lock the final position
• Route the cable using the removable ClickLoc connector collar through tight conduits
• Keep the original connector protectors on until you make the final connection

Commissioning and Maintenance Convenience

• The disposable installation tool simplifies clean connector protector placement
• ClickLoc connectors lock securely with a simple click to prevent loose contacts
• Gold-plated connection surfaces reduce electrical noise during routine loop checks

Ordering and Selection Guide

• Always match the total probe length with your specific Proximitor sensor calibration
• This 9.0-meter probe requires a specific extension cable for proper system length matching
• Choose the -01 option when you have deep axial clearance behind the machine case

Shipping, Packaging, and Warranty Terms

• Condition: Brand new and 100% original item in factory sealed packing
• Package Checklist: 330876 probe, connector protectors, and installation tool
• Factory Warranty: Complete 12-month comprehensive warranty coverage
• Dispatch Time: Orders ship swiftly within 24 to 48 hours from stock
• Courier Services: Premium global delivery via FedEx, UPS, and DHL Express

Frequently Asked Questions

• Question: Can I use this 9.0-meter probe with an 11mm Proximitor sensor?
  Answer: No, you must pair this probe with a dedicated 3300 XL 50 mm Proximitor sensor for accurate calibration.
• Question: What happens if the environmental temperature spikes to 240°C?
  Answer: The probe survives short-term exposure up to 250°C if the duration lasts less than 24 hours.
• Question: How does the FluidLoc cable help in steam turbine applications?
  Answer: The FluidLoc design blocks high-pressure steam and moisture from migrating internally through the probe wire core.
• Question: Do I need special tools to route this cable through narrow machine ports?
  Answer: The ClickLoc connector features a removable collar that significantly reduces the clearance width for easier routing.

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