Metering device for suspensions, in particular for filter aids, as a function of the true, of a weapon degree of the medium to be treated

摘要

This device functions according to the degree of turbidity in the media to be treated. It comprises a turbidity measuring device which is fitted in front of the filter and has a concave reflector, a lamp, a lens system, a measuring chamber and a photodiode or photoelectric cell. There is also an amplifier, a converter or pneumatic transducer, an adjusting or positioning device and a metering pump.