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The 330851-04-000-030-10-00-05 is a 3300 XL 25 mm sensor featuring a 1.06-inch diameter smooth side-exit case, 30 mm case length, and a 1.0-meter cable without armor, complete with global hazardous area approvals. This high-durability probe delivers a 12.7 mm linear range for steam turbine differential expansion monitoring, ensuring continuous high-accuracy operation up to 200°C with advanced FluidLoc moisture sealing and ClickLoc connectors.
ClickLoc™ Miniature Coaxial Connector
FluidLoc™ Moisture-Proof Cable
Multiple global hazardous area and intrinsic safety certifications from authoritative bodies such as ATEX and IECEx
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 330851-04-000-030-10-00-05 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.
Thermal Power Generation
Monitoring the differential expansion of steam turbines in large ultra-supercritical coal-fired power units to prevent thermal friction between the rotor and stator.
Nuclear Power Industry
High-dynamic monitoring of the axial long-distance displacement of large saturated steam turbines in nuclear reactor loops, ensuring stable operation under nuclear-grade high safety requirements.
Oil & Gas Upstream
Installed on large centrifugal natural gas export compressors on offshore drilling platforms to monitor axial and radial rotor gaps, preventing mechanical jamming under severe operating conditions.
Refining & Petrochemical
Monitoring the relative thermal growth of driving steam turbines in million-ton ethylene plant charge gas compressor trains to provide continuous asset protection for critical machinery.
Iron, Steel & Metallurgy
Used for differential expansion monitoring of turbines in blast furnace Top Gas Recovery Turbine (TRT) systems to ensure rotor safety in waste energy recovery equipment.
Hydroelectric Power
Monitoring the axial hydraulic thrust displacement of pump-turbine units during rapid switching between generation and pumping modes in large pumped-storage hydropower stations.
When using the 330851-04-000-030-10-00-05, special attention must be paid to the following. During installation, you must strictly monitor the Proximitor DC voltage output using a multimeter, ensuring the initial gap voltage is adjusted near the linear midpoint (typically around -10V DC) to prevent out-of-range readings during large displacements.
Although the probe and cable support 200°C high temperatures and feature FluidLoc moisture-proof sealing, the connector protector kit must be installed to completely prevent oil and steam from contaminating the ClickLoc coaxial connector and causing signal distortion. For unarmored cable routing, avoid sharp bends and keep the cable away from high-power cables to eliminate electromagnetic interference.
330851-04-000-030-10-00-05 is suitable for high-precision, non-contact monitoring of rotor differential expansion (DE) on mid-size to large steam turbine generators in high-temperature environments. The device features a 12.7 mm linear range, a 30 mm case length, and multiple country agency safety approvals for hazardous areas. For more technical specifications, please consult the official Bently Nevada website.
What kind of device is 330851-04-000-030-10-00-05?
It is a Bently Nevada 3300 XL series 25 mm large-scale non-contact proximity displacement probe, specifically designed for measuring physical displacement or differential expansion in industrial rotating machinery.
How does 330851-04-000-030-10-00-05 perform measurements?
The coil inside the probe generates a high-frequency alternating magnetic field. When a metal target approaches, eddy current losses are induced on its surface, which the probe senses as a change in electromagnetic impedance to convert into a distance signal.
What is the specific application/purpose of 330851-04-000-030-10-00-05?
Its core purpose is to monitor the differential expansion (DE) between the steam turbine rotor and the stator casing, preventing collision or friction caused by different thermal expansion rates.
What is the allowable ambient operating temperature range for 330851-04-000-030-10-00-05?
It supports long-term, continuous, and stable operation within a wide temperature range of -35 °C to +200 °C, and can withstand short-term high-temperature shocks up to +250 °C.
What ambient moisture protection technologies does 330851-04-000-030-10-00-05 feature?
It integrates both front and rear tip seals combined with proprietary FluidLoc cable block technology, completely preventing field moisture, oil, or gas from migrating through the cable interior into the probe tip.
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