Large fabricating machines such as those found in Power, Chemical, Steel, Pulp & Paper, Food and Beverage, and other manufacturing industries have bearings that require a constant supply of clean, uncontaminated oil. Lubricant oils are used to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. The property of reducing friction is known as lubricity.
Continuous Level Measurement of black liquor and soap offers some unique challenges. It is highly alkaline and the soap tends to separate out from the liquor, forming a foamy layer on top; this layer can vary from a few inches to several feet.