Practical version for testing moisture in oils

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If there are no equipment for monitoring oil water content, nor specialized laboratories or laboratory staff available, we can make simple preliminary judgments on-site. 1. Use a test tube to take a certain amount of lubricating or hydraulic oil. If the oil becomes cloudy or even emulsified, changing from transparent to opaque, it can be assumed that there is water present in the oil. Heat the test tube; if vapor appears, bubbles or water droplets form on the walls of the tube, or a popping sound is heard, it can be concluded that there is water in the oil ； 2. Take a thin copper wire, coil it into a loop, heat it red over a flame, and then place it in a test tube containing the sample oil; if there is a \"cracking\" sound, it indicates that the oil contains moisture ； 3. Use a test tube to take a certain amount of lubricating or hydraulic oil, and add a small amount of copper sulfate (anhydrous, white powder) to the oil; if the copper sulfate turns blue, it indicates the presence of water in the lubricant.