This report describes the development of an on-board contaminant diagnostic monitor to continuously measure contaminant level in a mining machine. Several concepts were investigated, and it was found that a static spool-type sensor was the most reliable and accurate. Laboratory and field tests showed that an instrument based on this concept is capable of measuring contaminant levels and/or size distribution, depending on the configuration of the sensor. Moreover, this instrument can function on emulsions or homogeneous fluids, while current laboratory equipment can operate on homogeneous fluids only.
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