Bently Nevada 330850-50-00
Bently Nevada 330850-50-00
Bently Nevada 330850-50-00
Bently Nevada 330850-50-00
Bently Nevada 330850-50-00
Bently Nevada 330850-50-00
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330850-50-00

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The 330850-50-00 is a 3300 XL 25 mm Proximitor Sensor, panel-mount type, with a 5.0 m (16.4 ft) system length and no approvals.
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Technical specifications for 330850-50-00

  • Manufacturer:
    Bently Nevada
  • Part Number:
    330850-50-00
  • Product Family:
    3300 XL 25mm Proximity Transducer System
  • Product Type:
    3300 XL 25 mm Proximitor Sensor
  • Stock:
    7
  • Total Length and Mounting Option:
    5.0 metres (16.4 feet) system length, panel mount
  • Agency Approval Option:
    No Approvals
  • Output Signal:
    -4 to -20 V DC
  • Sensitivity:
    8.0 V/mm (200 mV/mil) ± 2%
  • Operating Temperature:
    -51°C to +100°C (-60°F to +212°F)
  • Storage Temperature:
    -51°C to +105°C (-60°F to +221°F)
  • Weight:
    0.22 kg
  • Estimated shipping dimensions:
    8x6x6.5cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Configuration & Programming Safety & Compliance

Features:

  • Interface Between the 25 mm Probe, Extension Cable, and Monitoring System
  • Combines High-Precision Signal Conditioning with Extended Linear Range Capability
  • Operates in Conjunction with the 3300 XL 25 mm Transducer System and Bently Nevada Monitoring Platforms
The 330850-50-00 operates as the Proximitor Sensor in the 3300 XL 25 mm Transducer System, providing reliable signal conditioning and conversion for all measurement components within the chain. It continuously processes the eddy current signal from the 25 mm probe and extension cable, converting it into a precise 0.787 V/mm (20 mV/mil) output to support accurate position and vibration monitoring of rotating machinery. Seamless signal integration is standard with the 330850-50-00, however using proper system calibration will ensure optimal linearity across the full 12.7 mm (500 mils) measurement range in demanding industrial environments.

The 330850-50-00 provides essential signal conditioning functions common to the entire transducer system, and is a critical component of the measurement path, directly affecting the proper, normal operation of the overall monitoring system. One 330850-50-00 Proximitor Sensor is required per measurement channel depending on the specific application requirements. The 330850-50-00 is typically mounted in a protected enclosure near the machine train and connected to the monitoring rack via standard coaxial cabling.

For Differential Expansion (DE) measurement applications, the 3300 XL 25 mm Transducer System requires the 330850-50-00 Proximitor Sensor installed with the appropriate 25 mm probe and extension cable. In addition to standard position measurement operation, the differential expansion configuration also performs continuous growth rate monitoring. The 330850-50-00 measurement chain executes accurate DE tracking using the internal circuitry specified in the proximitor design. Using this method, the 330850-50-00 continually monitors the relative thermal growth between the turbine rotor and machine stator.

The 330850-50-00 Bently Nevada 3300 XL 25 mm Proximitor Sensor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 330850-50-00 3300 XL 25 mm Proximitor Sensor Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bently Nevada 330850-50-00 3300 XL 25 mm Proximitor Sensor Specs

General

  • Manufacturer Bently Nevada
  • Model 330850-50-00
  • Condition New Original ready stock
  • Product Family 330850-50-05,330850-50-CN,330850-51-00
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Differential Expansion (DE): It measures the physical growth difference between a spinning turbine rotor and its stationary outer casing during thermal changes.
  • Turbine Supervisory Instrumentation (TSI): It functions as a critical safety data link for automated machine shutdown and protection networks.
  • Large Asset Monitoring: It tracks axial thrust position on massive steam turbines, heavy compressors, and large fluid-filmed bearing pumps.
  • System Length Match: The -50 option dictates that this sensor requires a 3300 XL 25 mm probe and extension cable that equal an exact total electrical length of 5.0 meters.
  • Output Scale Factor: The device delivers a linear voltage output of 0.787 V/mm (200 mV/mil) across a total measurement range of 12.7 mm (500 mils).
  • Target Calibration: The system is calibrated at the factory for AISI 4140 steel targets. Other target metals require a scale adjustment factor inside your monitoring rack.
  • Physical Installation: The unit features a panel-mount base design. It has the same physical footprint as older legacy systems for quick drop-in replacement.
  • Approval Rating (-00): The -00 suffix specifies that this unit carries no hazardous area certifications. It must only be installed in safe, non-hazardous locations.
  • Electrical Isolation: The integrated plastic mounting base electrically isolates the sensor from the physical mounting plate to prevent ground loop interference.
  • Vibration Resistance: Field wiring connects via SpringLoc terminal strips. This design prevents wires from vibrating loose over long periods of machine operation.
  • Signal Protection: The housing resists radio frequency and electromagnetic interference. It can operate inside non-metal enclosures without losing signal quality.
Description
The Bently Nevada 330850-50-00 3300 XL 25 mm Proximitor Sensor is a complete 25 mm sensor system, including independent probes, extension cables and 3300 XL 25 mm sensors. This system provides a linear output of -4 to -20 V DC, with a sensitivity of 8.0 V/mm ±2%, and can accurately measure the differential expansion between the rotor and the casing of the steam turbine generator.

The total length of the system is 5 meters, and it adopts a panel installation method. It is suitable for precise monitoring of medium to large steam turbine generators. Its linear measurement range is 12.7mm, which can effectively capture the minute displacement changes between the rotor and stator, providing reliable data for equipment protection and condition monitoring.

This sensor can operate stably within a working temperature range of -51°C to +100°C, and its storage temperature range can reach -51°C to +105°C. The overall design is stable and suitable for long-term use in industrial environments, ensuring the safe and reliable operation of the generator set.
Alternative Names
330850 50 00 330850-50-05 330850-50-CN 330850-51-00 330850-90-00
Technical notes
The Bently Nevada 330850-50-00 is a 3300 XL 25 mm Proximitor Sensor designed as part of the 3300 XL 25 mm transducer system. It works with a separate 25 mm probe and extension cable to measure large-range shaft displacement, especially in demanding rotating machinery applications.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the key measurement capability of the 330850-50-00?
This sensor provides a calibrated output of 0.787 V/mm (20 mV/mil) and supports an extended linear range of 12.7 mm (500 mils). This wide measurement range makes it highly suitable for applications requiring precise monitoring of large shaft movement and thermal effects in heavy machinery.
Where is the 330850-50-00 typically used?
It is widely used in power generation, especially steam turbine generator systems where differential expansion monitoring is critical. It is also applied in oil and gas, petrochemical plants, and other heavy industries where large rotating equipment experiences significant thermal growth and mechanical stress.
What role does the 330850-50-00 play in steam turbine monitoring?
In steam turbines, it is used to measure differential expansion between the rotor and the casing during start-up, shutdown, and load changes. This helps ensure safe operating conditions by preventing mechanical contact or misalignment caused by uneven thermal expansion.
How should the 330850-50-00 be installed and integrated?
The sensor should be mounted in a protected enclosure near the machine train, with proper grounding and shielding to maintain signal integrity. It connects through a dedicated extension cable and must be used with compatible Bently Nevada 3300 XL monitoring systems, ensuring cable length and configuration meet system requirements.
What are the advantages of upgrading to the 330850-50-00?
Upgrading to the 330850-50-00 provides improved linearity, better temperature stability, and a wider measurement range compared to older proximity systems. These improvements enhance predictive maintenance accuracy, increase reliability in critical turbine applications, and help reduce unplanned downtime in industrial operations.