The percentage of water in the hydraulic oil should basically not exceed 0.12%. The range of 0.10 to 0.12 % is already critical. Here, at least oil-care measures should be taken. Above a concentration of 0.12%, however, it is essential to change the oil because of too much water in the oil.
By the way - this is how water can penetrate into the oil:
- As condensate, because the machine "breathes". At a temperature difference of 50 °C, 100 liters of oil expand by 3.5 liters. As it cools, moist air is drawn into the circuit and then the water it contains is separated as condensate.
- During steam cleaning
- In the event of a defective cooler
- As rainwater that has been on the lid of the oil drum for a long time.
In the analysis, OELCHECK can even demonstrate whether it is normal tap water or condensate.