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The 330851-01-00-20-10-00-00 is a 25mm eddy current expansion difference measurement proximity probe manufactured by Bentley Nevada, USA, part of the 3300 XL series. It is a core hardware front-end component in industrial large-scale rotating machinery condition monitoring and interlocking protection systems, commonly used to measure large-span expansion differences or ultra-large stroke axial displacements.
Equipped with standard FluidLoc moisture-resistant cable/span
The 3300 XL 25 mm Transducer System consists of a separate 25 mm probe, an extension cable, and a 3300 XL 25 mm Proximitor Sensor. The 0.787 V/mm (20 mV/mil) output gives this system a linear range of 12.7 mm (500 mils). Based on this linear range, the 3300 XL 25 mm Transducer System is suitable for measuring differential expansion (DE) on mid size to large steam turbine generators caused by the difference in growth rates between the turbine rotor and the machine stator (casing).
The 3300 XL 25 mm probe is designed for maximum survivability in the harshest steam turbine DE environments. It can continually operate and maintain its accuracy in high temperatures up to 200 °C (392 °F), and can withstand intermittent high temperatures up to 250 °C (482 °F). The 25 mm probe has both a front and rear seal which, combined with the FluidLoc cable (standard on all 25 mm probes), prevents moisture from entering the probe tip. Special high-temperature ClickLoc connectors are also standard on the probe and extension cable. Each probe and cable are provided with connector protectors and a disposable connector protector installation tool to ensure that the connectors remain free of contamination. The ClickLoc connector on the probe lead has a removable collar that facilitates routing the cable through tight clearances.
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 330851-01-00-20-10-00-00 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.
Fossil Fuel Power Generation
Precisely measuring the differential expansion of ultra-supercritical large steam turbine generators to prevent catastrophic rubbing between high-speed rotating blades and the stationary casing wall.
Petrochemical & Refining
Monitoring the long-stroke axial thermal displacement of rotors in large multi-stage centrifugal cracked gas compressors during start-up heating phases in million-ton ethylene plants.
Hydroelectric Power
Monitoring the ultra-large axial displacement of thrust bearings in giant hydro-generator units, as well as the axial play of long-span rotors under frequent load fluctuations.
Coal Chemical
Monitoring the axial thrust clearance and long-distance axial expansion of core ultra-large centrifugal air compressors and booster turbines in large-scale Air Separation Units (ASU).
Nuclear Power
Monitoring the full-stroke axial expansion of giant low-pressure cylinder rotors in million-kilowatt class low-speed steam turbines within nuclear conventional islands to provide critical safety interlock signals.
Four critical precautions must be observed when using this probe. First, the flat metal target diameter must not be less than 61mm, otherwise the measurement sensitivity will be distorted. Second, a precise initial gap long-stroke voltage calibration is required to ensure the 12.7mm ultra-large range perfectly covers the maximum differential expansion of the unit. Third, due to the 20 mm ultra-short fully-threaded case and frequent use in high-heat zones, cable routing must be kept away from high-temperature steam pipes and strictly prohibited from mixing with power cables. Fourth, when screwing into the bracket, the tightening torque must be strictly controlled at around 68 N·m to prevent excessive torque from squeezing, deforming, and damaging the internal electromagnetic coil.
It is a 3300 XL series 25mm eddy current proximity probe, manufactured by Bently Nevada, USA.
What is the primary purpose of 330851-01-00-20-10-00-00?
It is primarily used for measuring differential expansion (the relative thermal expansion between the rotor and casing) of mid-size to large steam turbine generators to prevent rubbing between rotating and stationary parts.
How should 330851-01-00-20-10-00-00 be used and connected?
It must be connected via its integrated ClickLoc gold coaxial connector to a dedicated 3300 XL 25mm extension cable, which then connects to the corresponding 25mm Proximitor Sensor.
What is the built-in cable length of 330851-01-00-20-10-00-00?
The "-10" code in the model indicates that the probe comes with a built-in 1.0-meter (approx. 3.3 feet) triaxial cable at its tail.
Does 330851-01-00-20-10-00-00 come with a stainless steel armored sleeve?
According to the second to last "-00" in the code, it uses a standard cable without a mechanical anti-wrap stainless steel armor.
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