The 330185-02 is a metric precision eddy current micrometer manufactured by Bently Nevada, belonging to the 3300 XL series. As a portable sensor calibration tool suitable for industrial and laboratory applications, it is primarily used for linearity verification, static gap voltage calibration, and performance verification of a complete measurement circuit consisting of various eddy current proximity probes (such as the 3300 XL), extension cables, and preamplifiers.
The Bently Nevada 330185-02 is widely used in instrument maintenance and system commissioning in the power, petrochemical, and metallurgical industries, serving as a core tool for ensuring the accuracy of shaft vibration and displacement monitoring channels. It uses a metric micrometer with a measuring range of 0 to 25 mm (compared to the imperial version of the 330185-01).
Field engineers can manually rotate the micrometer to change the physical displacement between the steel target and the probe while simultaneously measuring the DC gap voltage output from the preamplifier, thereby plotting an accurate voltage-displacement linearity curve to verify sensor compliance with the API 670 industry standard. To ensure the reliability of test data, manufacturers typically recommend calibrating this precision hardware annually.
