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330878-91-05

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330878-91-05 3300 XL 50 mm proximity sensor, this system has the longest linear measurement range in the eddy current transmitter product line, reaching 27.9 mm (1100 mils).
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Technical specifications for 330878-91-05

  • Manufacturer:
    Bently Nevada
  • Part Number:
    330878-91-05
  • Product Family:
    3300 XL 50mm Proximity Transducer System
  • Total Length:
    9.0 meters (29.5 feet) system length
  • Mounting Option:
    DIN mount
  • Agency Approval:
    Multiple Approvals
  • Proximitor Sensor Material:
    A380 aluminum
  • Compliance / Certification:
    European CE Mark approval
  • Wiring Interface:
    SpringLoc terminal strips
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    8.8x3.5x7cm
  • 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 Certifications & Standards Performance & Efficiency

Features:

  • Interface Between the 50 mm Probe and 3300 XL Monitoring System
  • Combines Capability of Eddy Current Signal Conditioning with Extended Linear Range Measurement
  • Operates in Conjunction with the 3300 XL 50 mm Probe and Extension Cable
The 330878-91-05 operates as the 3300 XL 50 mm Proximitor Sensor in a 3300 XL transducer system, providing reliable signal conditioning for large steam turbine generator applications. It continuously processes eddy current signals from the 50 mm probe across a total system length of 9.0 meters (29.5 feet) and delivers precise position measurements through the monitoring system to support differential expansion (DE) and rotor expansion (RX) monitoring of all critical machinery components. Seamless integration with 3300 XL monitoring systems is standard with the 330878-91-05, however using complementary transducer configurations will allow extended measurement range up to 56 mm (2.2 inches) in the event of large axial displacement scenarios. The 330878-91-05 has made improvements in several areas over previous proximitor designs in addition to incorporating advanced RFI/EMI immunity within the 3300 XL product line.

The 330878-91-05 provides essential measurement functions critical to turbine protection systems, and is a vital component of the monitoring path, directly affecting the proper, normal operation of the overall machinery protection system. One 330878-91-05 proximitor sensor is required per transducer channel depending on the desired measurement configuration. The 330878-91-05 occupies a compact DIN-rail or panel mount installation and is always located in proximity to the monitored equipment (the dedicated sensor mounting position).

For Dual Complementary Measurement applications, the 3300 XL 50 mm System requires a second 330878-91-05 proximitor sensor installed with a probe observing the opposite side of the collar. In addition to standard single transducer operation, the complementary configuration also performs extended range measurement. The 3300 XL dual transducer configuration executes measurement using the internal circuitry specified in the proximitor options. Using this method, the complementary measurement system continually monitors the position of the rotor relative to the stator. If the system detects that the differential expansion is approaching critical limits (outside configured measurement ranges), it will automatically trigger alarms and place an event in the System Event List.

The 330878-91-05 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 330878-91-05 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 330878-91-05 3300 XL 50 mm Proximitor Sensor Specs

General

  • Manufacturer Bently Nevada
  • Model 330878-91-05
  • 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): Its primary application is measuring the growth rate difference between a turbine rotor and its stator.
  • Large Steam Turbine Generators: Ideal for monitoring rotor expansion in large-scale machinery due to its extended linear range.
  • Harsh Environments: Specifically designed to survive the high-temperature and high-moisture environments typical of steam turbine DE monitoring.
  • Electrical Safety: Complies with the European CE mark for electromagnetic compatibility.
  • The "-05" suffix in the part number indicates Multiple Approvals for hazardous areas.
  • North America: Certified by the Canadian Standards Association (CSA) for Class I, Division 1 and 2 locations.
  • Europe: Certified by Baseefa for ATEX Zone 0 (Ex ia IIC T4/T5) and Zone 2 (Ex nA II T4/T5).
  • Functional Safety: Part of a system capable of achieving SIL 2 (random capability) and SIL 3 (systematic capability) according to IEC 61508.
  • Extended Linear Range: Offers the longest linear range in the Bently Nevada eddy current line at 27.9 mm (1100 mils).
  • Temperature Stability: Maintains accuracy in continuous temperatures up to 200°C (392°F) and intermittent exposure up to 250°C (482°F).
  • RFI/EMI Immunity: Enhanced resistance to radio frequency and electromagnetic interference allows installation in non-metallic housings without signal degradation.
  • System Interchangeability: Designed for complete interchangeability between probes and cables without requiring individual component bench calibration.
Description
The 330878-91-05 is a 3300 XL 50 mm Proximitor Sensor specifically designed for large steam turbine generator applications. This sensor is part of the 3300 XL 50 mm Transducer System, which provides the longest linear range in the eddy current transducer line at 27.9 mm (1100 mils). The 330878-91-05 features a total system length of 9.0 meters (29.5 feet) and utilizes DIN mount installation, making it suitable for high-density rail installations or traditional panel mount configurations.

The 330878-91-05 is engineered to solve critical measurement challenges in power generation environments, particularly for monitoring differential expansion (DE) and rotor expansion (RX) in large steam turbine generators. This sensor addresses the fundamental problem of measuring the growth rate differential between the turbine rotor and the machine stator (casing), which is essential for preventing catastrophic mechanical failures. The 330878-91-05 enables operators to detect when the rotor expands at a different rate than the casing, allowing for timely intervention before contact occurs between rotating and stationary components.

In practical applications, the 330878-91-05 supports redundant measurement configurations where two transducers observe the same side of a collar when the required range is less than 27.9 mm. For applications demanding 28 mm to 56 mm (1.1 to 2.2 inches) of total measurement range, the 330878-91-05 can be deployed in complementary arrangements with transducers mounted on opposite sides of the differential expansion collar. The 330878-91-05 incorporates advanced features including improved RFI/EMI immunity that achieves European CE mark approvals without special mounting considerations, ensuring reliable operation even in environments with high-frequency radio interference. The 330878-91-05 also utilizes SpringLoc terminal strips that require no special installation tools, facilitating faster and more robust field wiring connections in demanding industrial settings.
Alternative Names
330878-91-00 330878-91-CN 330878-90-05 330878-51-05 330878-51-00
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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 330878-91-05 Proximitor Sensor?
The 330878-91-05 is a 3300 XL 50 mm Proximitor Sensor designed for large steam turbine generator applications. It belongs to the 3300 XL 50 mm Transducer System and offers the longest linear measurement range in its eddy current sensor category, reaching up to 27.9 mm (1100 mils).
What are the key physical and installation features of the 330878-91-05?
The sensor has a total system length of 9.0 meters (29.5 feet) and supports DIN rail mounting. This makes it suitable for both high-density rail installations and conventional panel-mounted setups, providing flexibility in industrial environments.
What is the primary purpose of the 330878-91-05 in power generation systems?
The 330878-91-05 is specifically designed to monitor critical parameters such as differential expansion (DE) and rotor expansion (RX) in large steam turbine generators, helping ensure safe and efficient operation.

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