330876-02-50-01-00 Sensor Bently Nevada 3300 XL 50mm

Product Overview

The 330876-02-50-01-00 is a heavy-duty Bently Nevada 3300 XL 50 mm Proximity Probe built for extreme differential expansion (DE) monitoring. Engine drivers depend on this non-contact eddy current sensor to survive severe thermal stress inside large-scale steam turbine housing assemblies.

Featuring a dual front-and-rear seal design paired with flexible armored PFA-insulated cable, the 3300 XL 50 mm Series prevents moisture and oil penetration into the tip. High-temperature ClickLoc coaxial connectors feature a removable collar that allows hassle-free cable routing through tight machine ports.

Global PLC Spare HUB's Insight

Differential expansion sensors face severe thermal cycles near turbine exhaust hood zones and high-pressure casing glands. In field applications, standard cable jackets melt or degrade from ambient steam exposure. The high-temperature FluidLoc armored cable on the 330876-02-50-01-00 solves this issue by maintaining structural rigidity and signal integrity up to continuous 200°C conditions.

Configuration Breakdown

• 330876 — Base Model: 3300 XL 50 mm Proximity Sensor
  • -02 — Case Thread Option: Metric M14x1.5 thread with predrilled safety locknut
  • -50 — Total Cable Length: 5.0 meters (16.4 feet) continuous line
  • -01 — Armor Sleeve Option: High-Temperature FluidLoc cable with stainless steel armor
  • -00 — Agency Approval: Standard non-approved commercial version

Technical Specifications

Target Machinery & Applications

• Differential expansion tracking on high-pressure and intermediate-pressure utility steam turbines.
• Rotor-to-stator axial displacement measurements during warm-up and cool-down cycles.
• Ramp-up monitoring on large industrial gas turbine expansion joints.
• Casing movement and relative rotor position telemetry on heavy power generation sets.

Installation Guidance

• Use supplied disposable connector protection tools to keep ClickLoc interfaces clean during installation.
• Remove the ClickLoc collar temporarily when pulling sensor cable through narrow conduit passages.
• Secure the predrilled locknut with stainless safety wire to prevent thread loosening under vibration.
• Keep total system cable run matched to a dedicated 5-meter Proximitor Sensor unit.

Diagnostic Capabilities

• Detects thermal growth mismatch between spinning rotor shaft assemblies and static turbine casings.
• Prevents catastrophic internal blade contact during emergency shut-downs or quick cold starts.
• Provides continuous peak displacement data to plant asset monitoring networks.

Commercial Terms & Logistics

Frequently Asked Questions

Q1: Can I connect this 5.0-meter probe directly to a standard 9-meter Proximitor?

A1: No, 5.0-meter probe assemblies require calibrated 5-meter total system Proximitor units to preserve overall scale accuracy.

Q2: What benefit does the armored FluidLoc option provide over unarmored cables?

A2: The option 01 armored sleeve protects the internal line against physical pinches while blocking fluid ingress along the core.

Q3: How long can this probe withstand peak temperatures up to 250°C?

A3: The unit handles short-term thermal spikes up to 250°C (+482°F) safely for duration intervals under 24 hours.

Q4: Why does the ClickLoc connector feature a removable collar?

A4: Detaching the collar reduces outer connector diameter, allowing technicians to thread the lead through tight junction openings easily.

Q5: What is the main selection difference between M14x1.5 and 1/2-20 thread options?

A5: Model option -02 provides metric M14x1.5 threads, whereas option -01 utilizes imperial 1/2-20 threads for mounting block compatibility.

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