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The 330876-02-50-01-00 operates as a standalone sensor hardware entity within the 3300 XL 50 mm series catalog. Structurally, this non-contact eddy current device utilizes an oversized sensing head configuration to maintain an operational displacement window of 27.9 mm (1100 mils), delivering the maximum scale capability found among available proximity sensors of this classification.
High-temperature FluidLoc cable with stainless steel flexible conduit armor protection
Utilizes standard 7200 style brackets or sliding mounts without on-site drilling or bracket modifications
Tracking long-range displacement variations caused by rotor and stator growth differential in large machines
The 330876-02-50-01-00 functions as a component of the 3300 XL 50 mm Transducer System. Utilizing a large diameter coil, this system establishes a linear measurement range of 27.9 mm (1100 mils) to track the differential expansion (DE) or rotor expansion (RX) of large steam turbine generators resulting from the growth rate variances between the turbine rotor and the machine stator (casing). The 50 mm probe profile is available in three case and thread configurations to physically substitute standard 7200 50 mm systems, with standard 7200 style mounting brackets remaining available as accessories.
Additionally, a specific bracket configuration to adapt the probe to the 50 mm DE Integral transducer sliding mount base is available. The corresponding Proximitor Sensor outputs a 0.394 V/mm (10 mV/mil) electrical signal, which is identical to the output of the 7200 and 50 mm DE Integral systems, allowing for system migration without modifications to the monitor configuration. Critically, because the 330876-02-50-01-00 hardware model incorporates a 5.0-meter integral cable configuration, the probe couples directly to a matching 5-meter 3300 XL Proximitor Sensor, excluding the addition of an independent extension cable within the loop infrastructure. When performing a system replacement from legacy hardware, every individual transducer system component must be substituted with 3300 XL 50 mm hardware components.
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 330876-02-50-01-00 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.
Conventional Thermal Power Generation
Continuous physical displacement monitoring of large-scale differential expansion (DE) in high/low-pressure rotors and rotor expansion (RX) in low-pressure casings of supercritical and ultra-supercritical steam turbine generators.
Nuclear Power
Precision measurement of axial thermal growth and large-span relative casing deformation along the elongated shaft line of half-speed saturated steam turbines in nuclear power plants.
Coal Chemical & Ammonia Synthesis
Long-stroke safety monitoring of extensive axial shaft float in main air compressors, booster compressors, and synthesis gas compressor trains within large air separation units (ASU).
Marine & Heavy Ocean Engineering
Shaft line expansion measurement for main steam propulsion turbines in large LNG/container carriers and primary power generation turbomachinery on Floating Production Storage and Offloading (FPSO) vessels.
Salt Chemical & Chlor-Alkali Industry
Large-scale thermal shaft displacement tracking caused by intense process temperature fluctuations in multi-effect evaporation salt compressors and chlorine gas compressors.
The operation of the 330876-02-50-01-00 requires strict compliance with material calibration, loop architecture, and metal clearance specifications.
First, since it operates on a factory calibration profile defined for AISI 4140 target materials, deployment on alternative rotor alloys necessitates custom calibration curves.
Second, because this model incorporates an integrated 5-meter cable, it must couple directly to a matching 5-meter proximitor sensor, strictly excluding field cutting or the addition of an independent extension cable.
Lastly, due to the large magnetic field profile of the 50 mm probe, a specified open metal clearance zone must be maintained around its perimeter during installation, and sharp bending of the stainless steel armor must be avoided to prevent internal coaxial core damage.
The factory-installed calibration data for the Bently Nevada 330876-02-50-01-00 applies specifically to AISI 4140 material profiles. Applications involving different shaft metal compositions necessitate alternative calibration setups to maintain the scale factor within nominal technical criteria. Mechanically and electrically, the 330876-02-50-01-00 operates as a 5-meter system hardware variant. Loop configuration requires direct attachment to a 5-meter 3300 XL Proximitor Sensor , which excludes the addition of an independent extension cable.
It is a 3300 XL 50 mm eddy current proximity probe manufactured by Bently Nevada, used for long-range displacement monitoring in rotating machinery.
How should a long-range eddy current probe like the 330876-02-50-01-00 be used?
It must be mechanically secured to a casing bracket opposite the observed component, with the probe tip facing the axial or radial measurement surface, and its integral cable connected directly to a matching proximitor sensor.
What happens if the 330876-02-50-01-00 is installed on a non-AISI 4140 alloy rotor?
Any deployment on alternative rotor alloys requires custom calibration curves to maintain its nominal scale factor.
Does the 330876-02-50-01-00 require an intermediate extension cable for connection?
No, it must be paired directly with a matching 5-meter proximitor sensor without the use of an intermediate extension cable.
What is the basic measurement mechanism of the 330876-02-50-01-00?
It operates on the non-contact eddy current principle, where the probe tip coil generates an alternating magnetic field to measure gap variations by sensing eddy current losses on the metal surface.
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