Consistency transmitters measure the shear force caused by the interaction between blade sensor and fibres/fillers. A consistency transmitter contained into the pulp (consistency transmitters using a static or moving blade are all based on shear force working principle). Consistency transmitters linearly convert the shear force into a SMART 4÷20mA with HART ® protocol. Consistency transmitter works according to the type of pulp flowing into the pipe (waste paper [many different types], short or long fibre cellulose etc; and consistency transmitter also depends on filler type and content, etc. The output signal depends on consistency transmitter proportional to shear force, will change and the results will set the measuring span.