The BENTLY 330104 series represents the industry standard for non-contact displacement measurement. The 8mm tip size provides a robust balance between measurement range and spatial resolution. Operating on the eddy current principle, the probe generates a high-frequency magnetic field. As the metallic shaft approaches the probe tip, it alters the field's impedance, allowing the system to measure the distance with sub-micron precision without ever touching the rotating surface.
This specific part number defines the probe's mechanical and electrical characteristics. The "00" indicates unthreaded length, "05" signifies the overall case length, and "10" represents the total cable length (typically 1.0 meter). The "02" denotes the connector type (miniature coaxial), and the "CN" suffix indicates compliance with specific Chinese industrial standards or regional certifications. This level of customization ensures the probe fits exactly into the machine's bearing housing.

The 330104 is primarily used for two critical measurements: Radial Vibration and Axial Thrust. For radial vibration, the probe monitors the shaft's movement within the bearing clearance. For thrust monitoring, the probe measures the axial position of the shaft to prevent internal contact between rotating and stationary turbine components. Both measurements are vital for preventing catastrophic machine failure.
The probe tip is constructed from high-performance Polyphenylene Sulfide (PPS) plastic, which is resistant to high temperatures and aggressive industrial lubricants. The stainless steel case and probe lead are designed to operate submerged in oil or in high-pressure environments. The 3300 XL series is specifically engineered to provide better thermal stability than previous generations, reducing measurement drift as the machine warms up.
For accurate results, the 330104 must be installed using a precision mounting bracket. The "gap" between the probe and the shaft is typically set to a specific voltage (usually -10VDC) using a digital voltmeter. Once installed and paired with a 3300 XL Proximitor, the system provides a linear voltage output of 200 mV/mil (7.87 V/mm), allowing for easy interpretation by machinery protection monitors.



