Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com
  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power specializes in sourcing hard-to-find components like the 330878-51-00. As this model is obsolete, our supply ensures you can maintain your existing infrastructure without costly full-system retrofits.

330878-51-00

/ 4.9
1001 reviews | Need a Specific Revision?
The 3300 XL 50 mm proximity sensor is a key component of the 3300 XL 50 mm transmitter system, designed for high-precision measurement applications in large industrial machinery.
In Stock
Ships by Thursday, October 29
Fast Shipping Available
Get a quick price for 330878-51-00
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for 330878-51-00

  • Manufacturer:
    Bently Nevada
  • Part Number:
    330878-51-00
  • Product Family:
    3300 XL 50mm Proximity Transducer System
  • Product Type:
    Proximitor Sensor
  • Stock:
    1
  • Total Length:
    5.0 meters (16.4 feet) system length
  • Mounting Option:
    DIN mount
  • Agency Approval:
    No Approvals
  • Proximitor Sensor Material:
    A380 aluminum
  • Compliance / Certification:
    European CE Mark approval
  • Wiring Interface:
    SpringLoc terminal strips
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    7.8x6x6.2cm
  • 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 Use Cases Firmware & Updates Humidity Range

Features:

  • Interface Between the 50 mm Probe, Extension Cable, and Signal Conditioning Electronics
  • Combines Large Diameter Coil Technology with Extended Linear Range Measurement Capability
  • Operates in Conjunction with the 3300 XL 50 mm Probe and Extension Cable Components
The 330878-51-00 operates as the Proximitor Sensor in the 3300 XL 50 mm Transducer System, providing reliable signal conditioning and processing for eddy current proximity measurements. It continuously converts impedance variations from the 50 mm probe into usable output signals and distributes this processed data through standard industrial interfaces to support steady state operation of monitoring systems. Seamless integration with machinery protection systems is standard with the 330878-51-00, and its extended linear range capability allows precise measurement of large axial movements in critical rotating equipment. The 330878-51-00 incorporates advanced design improvements over previous proximity sensor generations, including the longest linear range of 27.9 mm (1100 mils) within the eddy current transducer product line.

The 330878-51-00 provides essential measurement functions for differential expansion and rotor expansion monitoring applications, and is a critical component of the protection path, directly affecting the proper, normal operation of large steam turbine generator monitoring systems. One 330878-51-00 Proximitor Sensor is required per measurement channel, working in conjunction with a dedicated 50 mm probe and extension cable to form a complete transducer system. The 330878-51-00 occupies a standard mounting configuration with DIN rail installation capability and is typically located within equipment enclosures near the measurement point.

For Differential Expansion applications requiring extended range measurement, the 330878-51-00 system supports dual transducer configurations observing opposite sides of a collar. In addition to standard single transducer operation, the complementary input arrangement effectively doubles the measurable range from 27.9 mm to 56 mm (1.1 to 2.2 inches). The 330878-51-00 dual transducer configuration executes measurement using the extended linear range specified in the system specifications. Using this method, the redundant measurement system continually monitors the relative position between turbine rotor and machine stator. If the system detects that differential expansion exceeds normal operating parameters (outside configured tolerance levels based on thermal growth differentials), it will automatically generate alerts for machinery protection systems and place an event in the monitoring system event log.

The 330878-51-00 Bently Nevada 3300 XL 50 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 330878-51-00 3300 XL 50 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 330878-51-00 3300 XL 50 mm Proximitor Sensor Specs

General

  • Manufacturer Bently Nevada
  • Model 330878-51-00
  • Condition New Original ready stock
  • Product Family 330878-50-00,330878-51-05,330878-90-05
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): Measuring the difference in growth rates between a turbine rotor and its casing.
  • Rotor Expansion (RX): Monitoring the axial growth of large steam turbine generator rotors.
  • Harsh Environments: Specifically engineered for the extreme conditions inside large steam turbine generators.
  • Retrofitting: Serving as a direct, high-performance replacement for older 7200 series 50 mm and 130713 DE transducer systems.
  • Analog Operation: As an eddy current proximity sensor, the Proximitor Sensor is an analog device and does not typically utilize user-serviceable firmware or software updates in the way a digital controller would.
  • Maintenance: Physical verification of the transducer system's operation is recommended during installation and periodically thereafter by simulating shaft motion.
  • Field Notifications: While the sensor itself is not "updated," Bently Nevada may issue Field Notification Letters regarding system-wide improvements or technical advisories that can be found on the Baker Hughes Document Archives.
  • Humidity: The sensor experiences less than a 3% change in Average Scale Factor (ASF) when tested according to IEC 68-2-66 standards.
  • Moisture Resistance: The 50 mm probe features front and rear seals combined with High Temperature FluidLoc cable to prevent moisture ingress into the tip.
Description
The 3300 XL 50 mm Proximitor Sensor is a critical component of the 3300 XL 50 mm Transducer System, designed specifically for high-precision measurement applications in large-scale industrial machinery. The 330878-51-00 represents a complete system configuration featuring a total length of 5.0 meters (16.4 feet), with DIN mount installation capability and no additional agency approvals required.

This 330878-51-00 transducer system comprises three essential elements: a separate 50 mm probe, an extension cable, and the 3300 XL 50 mm Proximitor Sensor itself. The system's large diameter coil technology delivers an exceptional maximum linear range of 27.9 mm (1100 mils), establishing it as the longest linear range solution within the eddy current transducer product line. This extended measurement capability makes the 330878-51-00 particularly suitable for monitoring differential expansion (DE) and rotor expansion (RX) in large steam turbine generators, where precise tracking of thermal growth differentials between the turbine rotor and machine stator (casing) is essential for operational safety and efficiency.

The 330878-51-00 excels in differential expansion measurement applications where two proximity transducers monitor a collar or ramp positioned at a distance from the thrust bearing. This 330878-51-00 system accommodates various mounting configurations based on specific machinery requirements: utilizing two transducers observing the same side of a collar for applications with sufficient collar height and measurement ranges under 27.9 mm (1.1 inches), or deploying complementary input transducers on opposite sides of a collar to effectively double the measurable DE range when total measurement requirements extend from 28 mm to 56 mm (1.1 to 2.2 inches). The selection criteria for these 330878-51-00 mounting arrangements depend on available target size, anticipated rotor axial movement magnitude, and the specific differential expansion target configuration present in the machine.
Alternative Names
330878-51-05 330878-51-CN 330878-50-00 330878-50-05 330878-91-00 330878-90-00 330878-51-BR
Technical notes
The Bently Nevada 330878-51-00 requires strict adherence to system matching (probe, extension cable, and Proximitor) to maintain specified accuracy and ensure proper calibration. The Bently Nevada 330878-51-00 must be installed in a protected, non-hazardous area or verified against specific regional explosion-proof certifications for use in Class I, Div 2 hazardous locations.
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

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.
How is the 330878-51-00 used in differential expansion measurement setups?
The system typically uses two proximity transducers to monitor a collar or ramp located away from the thrust bearing. These transducers detect axial movement and expansion differences during operation.
What configuration options are available during the installation of 330878-51-00?
The 330878-51-00 supports multiple configurations. Two transducers can be mounted on the same side of a collar for redundant measurement when the required range is below 27.9 mm. Alternatively, transducers can be installed on opposite sides of the collar to create a complementary setup that effectively doubles the measurement range.
Does the Bently Nevada 330878-51-00 require a specific cable length to maintain calibration?
Yes, the Bently Nevada 330878-51-00 is calibrated for a total system length of 5.0 meters (probe + extension). Using a different cable length will degrade the linear range and accuracy, requiring a system-wide recalibration.
Can the Bently Nevada 330878-51-00 be integrated with non-Bently monitoring systems?
While the Bently Nevada 330878-51-00 is designed for the 3300 XL platform, its -17.5V to -26V output is compatible with standard industrial signal converters, provided the impedance matching of 50 ohms is respected.
Is the Bently Nevada 330878-51-00 suitable for retrofitting older monitoring systems?
The Bently Nevada 330878-51-00 is designed for DIN-rail mounting, which makes it highly adaptable for retrofitting. However, ensure that the existing transducer probes are compatible with the 50 mm XL series requirements.