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The 330102-20-55-10-02-00 is an 8 mm imperial threaded proximity probe belonging to the Bently Nevada 3300 XL series. This specialized mid-length configuration features a 3/8-24 UNF thread, a 2.0 inch unthreaded length, a 5.5 inch overall case length, and a 1.0 meter total cable length fully enclosed in a flexible stainless steel armor jacket for premium protection against mechanical crushing and physical abrasion.
Robust Flexible Stainless Steel Armor Protection
API 670 Interchangeability Eliminates Bench Calibration
Precise Imperial Mid Length Case for Specific Penetration
Operating on eddy current principles, the system provides an output voltage that is directly proportional to the distance between the probe tip and the observed conductive surface and can measure both static position and dynamic vibration values. The primary applications are vibration and position measurements on fluid-film bearing machines, as well as Keyphasor reference and speed measurements.
The 3300 XL 8 mm system delivers the most advanced performance in our eddy current proximity transducer systems. The standard 3300 XL 8 mm 5-meter system configuration, which can be formed by connecting this 1.0 meter probe to a 4.0 meter extension cable, fully complies with the American Petroleum Institute API 670 Standard for mechanical configuration, linear range, accuracy, and temperature stability.
All 3300 XL 8 mm proximity transducer systems provide this level of performance and support complete interchangeability of probes, extension cables, and Proximitor sensors, eliminating the need to match or bench calibrate individual components. Each 3300 XL 8 mm Transducer System component is backward compatible and interchangeable with other non XL 3300 series 5 mm and 8 mm transducer system components. This compatibility includes the 3300 5 mm probe, for applications in which an 8 mm probe is too large for the available mounting space.
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 330102-20-55-10-02-00 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.
Power Generation Industry
It is used to monitor the shaft vibration and axial displacement of large gas turbines, steam turbines, and generators to prevent rotor-to-stator rubbing caused by severe load variations.
Oil & Gas Extraction
It is installed on high-pressure centrifugal compressors and long-distance pumps for natural gas pipelines to monitor rotational speed and bearing wear.
Petrochemical and Refining Industry
It provides real-time monitoring of bearing dynamic balance in heavy critical pumps and charge gas compressors within catalytic cracking and hydrocracking units.
Coal Chemical Industry
It monitors the oil film bearing conditions of ultra-large centrifugal air compressors, boosters, and gasifier axial fans in air separation units.
Iron & Steel and Metallurgy Industry
It is utilized for shaft train monitoring of blast furnace blowers and Top Gas Recovery Turbine (TRT) power generation units to ensure continuous and safe operation under high temperatures and pressures.
Hydroelectric Power Industry
It is used to monitor the swing (radial vibration) and axial displacement of hydro-generator units to analyze abnormal vibrations caused by hydraulic imbalance or generator magnetic asymmetry.
Due to its 5.5 inch overall case length and 2.0 inch unthreaded length, specialized locknuts must be utilized to secure the probe firmly during imperial deep hole or bearing housing installations, preventing position drift under high vibration conditions.
Precisely adjust the initial mounting gap to the center of its linear range, typically corresponding to minus 10 Vdc, and maintain a side physical clearance of at least twice the probe tip diameter to eliminate electromagnetic interference from surrounding metals. During routing, although the cable is protected by an integrated stainless steel armor jacket, excessive pulling and sharp kinks must still be strictly avoided to ensure the bend radius stays above 25.4 mm.
Before connecting the Miniature Coaxial ClickLoc connector, the core connecting interface must be kept completely clean and dry, and it must be tightened by hand only—never use tools.
Lastly, since this probe features a 1.0 meter cable, it must be combined with a matching 4.0 meter extension cable to connect to the Proximitor sensor, ensuring the measurement accuracy of the complete 5 meter system.
The Bently Nevada 330102-20-55-10-02-00 is an imperial threaded proximity eddy current probe belonging to the 3300 XL 8 mm series, primarily utilized for axial displacement, radial vibration, and Keyphasor phase reference monitoring of large industrial rotating machinery. Operating on eddy current principles, the product generates a high frequency electromagnetic field from the probe tip to interact with the observed metal shaft surface, providing an analog voltage signal directly proportional to the distance between the probe tip and the target conductive surface while simultaneously measuring both static position and dynamic vibration values.
This is a 3300 XL 8mm Eddy Current Proximity Probe manufactured by Bently Nevada. It uses the eddy current principle to precisely measure the micron-level vibration, displacement, or rotational speed of rotating machinery shafts.
What is the working principle of 330102-20-55-10-02-00?
The coil inside the probe tip generates a high-frequency electromagnetic field. When a metal shaft approaches, eddy currents are induced on its surface. The magnetic field created by these eddy currents weakens the probe's original field, changing the coil impedance. The Proximitor sensor detects this change and converts it into a voltage signal proportional to the displacement.
How to use the product 330102-20-55-10-02-00?
The probe must be rigidly mounted perpendicular to the target metal surface. It is then connected to a 3300 XL Proximitor sensor using an extension cable. The Proximitor outputs the signal to monitoring systems like the 3500 System for condition display and alarm protection.
Does the target material affect the reading of 330102-20-55-10-02-00?
Yes, significantly. The standard factory calibration for Bently Nevada probes is AISI 4140 steel. If the target is aluminum, copper, stainless steel, or other alloys, the output voltage will be highly distorted due to differing conductivity and permeability, requiring recalibration of the Proximitor for that specific material.
What are the common causes of damage to 330102-20-55-10-02-00?
Common causes include mechanical impact (the shaft hitting the plastic tip during extreme displacement), internal wire breaks from excessive cable bending or pulling, water or oil contamination in the connector, and stripped threads from over-tightening during installation.
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