is mounted inside the machine particularly inside the wire section the press section the drying section or after the drying section in front of a calendar this measuring arrangement is connected via a signal line to a controller that is mounted inside a device for producing the fibrous material suspension application_number US 60838706 A description referring now to the drawings and more particularly to fig1 there is shown a fiber stock suspension being supplied in a device 10 fig1 to a pump disperger that is a pump fluffer 12 where it is treated by shear forces in order to break down the fiber material into individual fibers exposing the fiber surfaces and increasing the contact surfaces accordingly the pump disperger 12 is simultaneously utilized as a reactor for the chemical precipitation reaction it can specifically be designed so that a reduction of the fibrous suspension 39 s flow speed occurs in a reduction channel 14 in the present example it is designed so that the fibrous stock suspension is generally transported in radial direction toward the outside originating from a central radial inner area a static mixer may be utilized in place of and or in conjunction with the pump disperger 12 the reaction channel 14 of the pump disperger 12 is restricted at least partially by structured surfaces which can be formed for example by bar or knife sets the reaction channel 14 is formed between two plates 16 which are located opposite each other and which have structured surfaces between which the fibrous stock suspension is transported in radial direction towards the outside a plug screw 18 is located prior to the pump disperger 12 in order.