device and foerfarande foer dosage of tvaettmedel

摘要

The invention relates to a method of metering detergent into a washing solution in large washing apparatuses and systems comprising measuring from a washing solution containing water and detergent a property proportional to the detergent concentration of the washing solution, and adding detergent to the washing solution only during a predetermined metering period (T2) when the detergent concentration corresponding to the property measured from the washing solution is below a predetermined threshold value during said metering period, and the addition of detergent being prevented after each metering period (T2) for the time of a predetermined mixing period (T1).