Moisture appears in hydraulic oil and there is nothing we can do to avoid it. In extreme cases, moisture in hydraulic oil can be the cause of total system failure. Moisture saturation in hydraulic oil can be measured with moisture sensors. This thesis presents the results of measurements for moisture saturation of hydraulic oil. The two selected sensors on which the tests were performed are described. The measurements were performed for eight different pressures (5 bar, 10 bar, 15 bar, 20 bar, 25 bar, 30 bar, 35 bar in 40 bar) and three different flows (1 l/min, 2 l/min in 3 l/min). We also tested the moisture seperator prototype.
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