Abstract
A new on-line ferrographic analyzer is developed using electromagnetic flux measuring method. This analyzer used the Hall-effect sensors between two poles of the magnet to detect wear debris. When the wear debris was captured by magnetic attraction at the air gap between the poles of the magnet, the magnetic flux density varies with the quantity of wear debris. Moreover, the output voltage difference of Hall-effect sensor is significantly influenced by the magnetic flux density. Hence, the relationship between the voltage difference or wear index and the quantity of wear debris can be obtained by using the multilinear regression analysis. The correlation formula for the wear debris concentration can be derived for a wide range of flow rate, operative time, and Hall voltage difference. By using this correlation formula in a single chip microprocessor, the wear debris concentration can be evaluated at a certain flow rate and operative time.
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