Device for monitoring water-miscible cooling lubricant

A device for monitoring water-miscible cooling lubricant (12), characterized in that a chamber (1) has a first connection (2) for the particular supply of water (10), a second connection (3) for the particular supply of water-miscible concentrate (11), a third connection (4) for the supply of water-miscible cooling lubricant (12) to at least one machine tool and a fourth connection (5) for discharging the water-miscible cooling lubricant (12) from the chamber (1), in that the first connection (2), the second connection (3) and the third connection (4) are connected to the interior of the chamber (1) by means of a mixer (6), in that the interior of the chamber (1) is connected to at least one medium-conveying apparatus (16), in that a refractometer (7) is located in the chamber (1) and thus in the water-miscible cooling lubricant (12), in that the refractometer (7) is arranged between a source of electromagnetic radiation (8) and a digital camera (9) or a radiation detector, and in that the digital camera (9) or the radiation detector is connected to a data processing system (18) that controls the supply of water (10), the supply of water-miscible concentrate (11), the supply of water-miscible cooling lubricant (12) of the machine tool and the medium-conveying apparatus (16) in such a manner that a particular value or a particular range of the refraction caused by the water-miscible cooling lubricant (12) is achieved and/or maintained and the determined amounts of water (10), concentrate (11) and water-miscible cooling lubricant (12) are recorded.