330878-91-05 3300 XL 50 mm Proximitor Sensor

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	330878-91-05
Minimum Order Quantity:	1
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 330878-91-05 3300 XL 50 mm Proximitor Sensor is an advanced eddy current transducer system engineered for monitoring differential expansion (DE) and rotor expansion (RX) in large steam turbine generators. Paired with a 50 mm proximity probe and an extension cable, the system provides an exceptionally long linear range of 27.9 mm (1100 mils), the largest in the Bently Nevada 3300 XL series. This extended range allows precise measurement of axial displacement caused by differential thermal expansion between the turbine rotor and the machine stator. Constructed from durable A380 aluminum, the Proximitor Sensor supports DIN-rail mounting or panel installation and accepts one non-contacting 3300 XL 50 mm Proximity Probe and Extension Cable. It features a linear voltage output of 0.394 V/mm (10 mV/mil), compatible with legacy 7200 50 mm systems, enabling seamless upgrades without monitor reconfiguration. The sensor operates reliably from –51°C to +100°C (–60°F to +212°F) and can withstand storage temperatures up to +105°C (221°F). High-temperature FluidLoc cables and ClickLoc connectors ensure moisture protection, robust mechanical stability, and reliable field connections. With superior RFI/EMI immunity and SpringLoc terminals, the 3300 XL 50 mm Proximitor Sensor delivers precise, repeatable measurements in harsh industrial environments, making it ideal for automated vibration monitoring and predictive maintenance in large turbines.

Applications

Differential Expansion Measurement
Measures axial displacement of steam turbine rotors due to thermal growth differences between rotor and stator, ensuring safe operation and reducing unplanned downtime.

Rotor Expansion Monitoring
Monitors rotor growth in real-time during startup and shutdown sequences, allowing turbine operators to manage thermal expansion and avoid shaft interference.

Large Steam Turbine Generators
Integrates with generator monitoring systems to provide precise DE and RX measurements, critical for maintaining performance and extending equipment life.

Automated Vibration Control Systems
Feeds accurate positional data to DCS or PLC systems for predictive maintenance and automated protection of turbine and auxiliary equipment.

Turbine Retrofit and Upgrade Projects
Supports upgrading legacy 7200 50 mm transducer systems without reconfiguring existing monitor wiring or software, reducing installation time and costs.

Specifications

Competitive Advantage

Longest Linear Range
Offers 27.9 mm (1100 mils) linear range, the highest in its class, accommodating large axial displacements in turbine DE applications.

High-Temperature Operation
Operates continuously at up to 200°C (392°F) and intermittent exposure to 250°C (482°F), with FluidLoc cables preventing moisture ingress.

Seamless System Compatibility
Outputs 0.394 V/mm (10 mV/mil), identical to legacy 7200 and DE Integral systems, allowing straightforward upgrades without monitor modifications.

Robust Industrial Design
A380 aluminum housing, high-temperature connectors, and ClickLoc assembly ensure mechanical durability, moisture protection, and reliable field connectivity.

Enhanced EMI/RFI Immunity
Advanced shielding and design enable installation near high-frequency electrical signals without interference, supporting accurate automated measurement.