Bently Nevada 330850-51-00 3300 XL 25 mm Proximitor Sensor

The Bently Nevada 330850-51-00 is a high-performance Proximitor® sensor from the 3300 XL 25 mm proximity transducer system series. This signal conditioning unit serves as the interface between a 25 mm eddy current proximity probe and your machinery monitoring system, converting raw probe signals into a precise, linear voltage output proportional to the distance between the probe tip and the target surface .

Unlike standard 8 mm systems with limited range, the 25 mm system is specifically engineered for long-range displacement measurements required in large rotating machinery applications such as steam turbines, axial compressors, and generators.

  • Item No :

    330850-51-00
  • Order(MOQ) :

    1
  • Payment :

    EXW/CIF
  • Product Origin :

    USA
  • Shipping Port :

    Wuhan, Hubei, China
  • Lead Time :

    3-5 days
  • Weight :

    2kg
  • Product Overview

    Bently Nevada 330850-51-00 3300 XL 25 mm Proximitor Sensor

     

    Long-Range Signal Conditioner for 25 mm Proximity Transducer System

    More details

    Country of origin

    USA

    Product condition

    New

    Warranty

    one year

    Payment Method

    T/T, Western Union

    Shipping Method

    DHL/FedEX/UPS/TNE/EMS

    Key Features & Benefits

    • Extended Linear Range: Provides an 12.7 mm (500 mils) linear measurement range — significantly larger than standard 8 mm systems, essential for tracking thermal expansion and axial shaft displacement in large turbines 

    • Tailored Sensitivity: Delivers a scale factor of 0.787 V/mm (20 mV/mil) , optimized for long-range displacement measurements 

    • High Noise Immunity: Improved RFI/EMI immunity allows the sensor to achieve European CE mark approvals without special mounting considerations 

    • Tool-Free Wiring: SpringLoc™ terminal strips require no special tools, facilitating faster and more robust field wiring connections 

    • Flexible Installation: Thin design supports both high-density DIN rail and traditional panel mount configurations 

    • Wide Operating Temperature: Engineered for harsh industrial environments with a −51°C to +100°C operating range 

    • Low Supply Sensitivity: < 2 mV output change per 1V input voltage change ensures stable operation under fluctuating power conditions 

    Part Number Breakdown

    The part number 330850-51-00 provides specific configuration details :

     
     
    Suffix Code Meaning
    330850 - Base model for 3300 XL 25 mm Proximitor Sensor
    -51 - 5 = 5.0-meter total system length; 1 = DIN rail mount
    -00 - No agency approvals required

    Technical Specifications

     
     
    Category Specification
    Manufacturer Bently Nevada (Baker Hughes)
    Model Number 330850-51-00
    Product Type 3300 XL 25 mm Proximitor Sensor
    System Compatibility 3300 XL 25 mm Transducer System
    Total System Length 5.0 meters (16.4 feet)
    Mounting Option 35 mm DIN rail mount
    Agency Approval None (No Approvals)
    Linear Measurement Range 12.7 mm (500 mils)
    Scale Factor 0.787 V/mm (20 mV/mil)
    Power Supply (Without Barriers) -17.5 VDC to -26 VDC
    Power Supply (With Barriers) -23 VDC to -26 VDC
    Maximum Current Draw 12 mA
    Output Resistance 50 Ω
    Supply Sensitivity < 2 mV per 1V input change
    Housing Material A308 or A380 aluminum
    Operating Temperature (Sensor) -51°C to +100°C (-60°F to +212°F)
    Storage Temperature -51°C to +105°C (-60°F to +221°F)
    Relative Humidity 100% condensing, non-submersible (when connectors are protected)
    Weight Approximately 0.25 kg (8.8 oz)
    Country of Origin USA

    Important System Requirements

    The Proximitor sensor is one-third of a complete 3300 XL transducer system. For optimal performance and proper calibration, it must be used with matching components :

     
     
    Critical Item Requirement
    Probe Type 3300 XL 25 mm Proximity Probe
    System Length Total electrical length must equal exactly 5.0 meters (probe + extension cable)
    Sensitivity Match 20 mV/mil scale factor system

     

    CRITICAL: System Length Match Required — The 330850-51-00 is specifically calibrated for a 5.0-meter total electrical length. Pairing it with a 9.0-meter probe/extension cable combination will result in significant scale factor errors and system nonlinearity. Always match the Proximitor length option to the physical sum of your probe and extension cable .

    Voltage Range Warning — Operation at a voltage more positive than −23.5 VDC when barriers are present can result in reduced linear range .

    Applications

    The 25 mm system is the preferred choice for applications requiring extended measurement range beyond the capability of standard 8 mm systems :

     
     
    Industry Application
    Power Generation Differential expansion monitoring in large steam and gas turbines during startup and thermal cycling
    Oil & Gas Casing expansion tracking on high-pressure axial compressors and pipeline compressors
    Petrochemical Centralized monitoring cabinets for balance-of-plant machinery in hazardous locations
    Mining & Heavy Industry Rotor growth and position monitoring in heavy-duty rotating equipment

    Key Measurement Functions:

    • Differential Expansion (rotor-to-casing axial movement)

    • Shell Expansion / Casing Expansion (thermal growth monitoring)

    • Shaft Position Tracking (rotor axial position)

    System Integration

    The 330850-51-00 integrates seamlessly with Bently Nevada monitoring systems:

     
     
    Compatible Monitoring System Application
    3500/45 Position Monitor Position measurement module
    3500/42M Proximitor/Vibration Monitor Vibration monitoring
    1900/65 General Purpose Equipment Monitor General-purpose monitoring

    Installation Notes:

    • The Proximitor can be mounted on a standard 35 mm DIN rail

    • For optimal measurement, the probe should be "gapped" to the center of its linear range (typically corresponding to -10.0 VDC output)

    • Gold-plated ClickLoc connectors ensure reliable signal transmission

    • Coaxial connectors must be kept clean and dry; microscopic oil or moisture contamination can cause signal drift 

    Ordering & Shipping Information

     
     
    Detail Information
    Condition New & Original
    Stock Status In Stock
    Warranty 12 Months
    Shipping Port Wuhan, China
    Lead Time 5-7 Working Days
    Payment Terms T/T, Western Union
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