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The 330876-02-90-00-00 is a 3300 XL 50 mm non-contact proximity probe manufactured by Bently Nevada, featuring an integrated 9.0-meter FluidLoc coaxial cable that connects directly to a 3300 XL 50 mm Proximitor Sensor. Utilizing a large-diameter sensor coil configuration, this specific hardware is typically selected for monitoring the differential expansion (DE) or rotor expansion (RX) within large steam turbine generators.
The standard average scaling factor is 0.394 V/mm (10 mils/V)
End-to-end impedance balance
Excellent temperature stability
It serves as a standardized structural component to trace the relative movement resulting from the difference in thermal growth rates between the turbine rotor and the machine stator (casing), acting as a vital hardware anchor point for long-term machinery protection. Built to withstand these harsh steam turbine environments, the probe assembly operates continuously in conditions up to 200°C (392°F) and accommodates intermittent thermal spikes up to 250°C (482°F).
The physical structure incorporates a dual front and rear sealing mechanism combined with the standard high-temperature FluidLoc configuration to prevent moisture and bearing oil mist from entering the probe body. Furthermore, the integrated 9.0-meter cable terminates in a high-temperature ClickLoc connector with a removable physical collar, which significantly facilitates routing the line through tight machine clearances and narrow conduits during field installation, ensuring a robust, tool-free physical connection directly to the Proximitor Sensor.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 330876-02-90-00-00 Proximity Probe Manuals, Datasheets, Drivers, 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.
Coal-Fired Power
Installed at the high-pressure (HP) and intermediate-pressure (IP) stages of large subcritical or supercritical steam turbines to track the thermal growth differential between the shaft and the outer casing during start-up and transient grid loading.
Nuclear Power Plants
Positioned within the continuous monitoring network of high-power nuclear steam turbine generator sets to observe axial shaft displacement, ensuring severe thermal expansions do not induce physical rotor-to-stator rubbing inside the containment zone.
Hydroelectric Power
Utilized in large-capacity vertical or horizontal hydro-turbines to trace the axial thermal elongation and thrust positioning of the massive main shaft under variable hydraulic thrust loads.
Iron & Steel Metallurgy
Employed on high-shaft-power blast furnace axial blowers to record the structural axial elongation of the main rotor assembly, preventing damage caused by heavy thermal loading during continuous blowing cycles.
Coal Chemical Industry
Monitoring the axial travel and expansion of the high-speed syngas (synthesis gas) compressors and carbon dioxide compressors operating under corrosive and high-temperature environments.
When utilizing this 50 mm large-scale probe, a flat metal target surface with a diameter of no less than 102 mm must be provided on the observed rotor side to prevent electromagnetic edge leakage from the large-diameter sensing coil. Given its integrated 9.0-meter coaxial cable, the minimum physical bend radius must not be less than 25.4 mm during field routing, and this line must connect directly to the matching Proximitor Sensor without any intermediate extension cables.
Furthermore, the initial mechanical gap must be strictly controlled with the threaded case maintained in precise axial alignment during installation; once the ClickLoc connector is secured, original sealing methods should be applied to shield the physical signal path against the ingress of high-pressure oil mist or condensing steam from the bearing housing.
This Bently Nevada 3300 XL series 50 mm probe assembly (Model: 330876-02-90-00-00) is a standardized hardware component for monitoring axial differential expansion across large industrial rotating machinery. Physically featuring an M14×1.5 metric threaded case and a 50 mm tip diameter, this assembly provides a linear displacement measurement travel of up to 27.9 mm. Serving as the terminal sensing node within the complete eddy current sensor protection chain, it is calibrated by default from the factory for AISI 4140 steel target surfaces, seamlessly matching the material specifications of core industrial drive shafts. Its physical construction incorporates a stainless steel casing and a high-density polyphenylene sulfide (PPS) encapsulated tip, integrated with a 9.0-meter-long unarmored FluidLoc high-temperature fluid-blocking coaxial cable. This configuration complies fully with the American Petroleum Institute (API) 670 standard for mechanical configuration and temperature stability, supporting continuous operation across an extensive temperature range from -51°C to +200°C and in 100% condensing humidity environments. Due to the holistic physical impedance matching of its integrated 9.0-meter cable, it connects directly to the corresponding 3300 XL 50 mm Proximitor Sensor during field installation without requiring intermediate extension cables, thereby enabling complete plug-and-play component replacement in subsequent supply chain maintenance.
This is a 3300 XL 50 mm eddy-current non-contact proximity displacement probe manufactured by Bently Nevada, primarily utilized for large displacement mechanical parameter measurements in industrial fields.
What is the primary field monitoring purpose of the 330876-02-90-00-00?
Its primary industrial purpose is to monitor the Differential Expansion (DE) between the rotor and casing of large steam turbines to prevent physical rubbing and contact.
What is the basic physical operating mechanism of the 330876-02-90-00-00?
The probe tip generates a high-frequency electromagnetic field and utilizes variations in the physical gap between this field and the conductive metal surface to convert it into a corresponding negative DC voltage signal output.
What physical material is the probe tip of the 330876-02-90-00-00 constructed from?
The probe tip sensing head is encapsulated in high-density polyphenylene sulfide (PPS) plastic, featuring strong resistance against wear and chemical media erosion.
What water and moisture-proofing physical sealing level does the 330876-02-90-00-00 possess?
It features a dual front-and-rear sealing configuration; its FluidLoc cable fully blocks high-pressure and high-temperature steam, supporting 100% condensing humidity environments (though fully submerged operation is not recommended).
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