31 now comprises a signal m indicative of the gross kilowatts the signal m is in percent and is received by signal converter 32 which changes this percent gross kilowatt signal m to an analog signal m 39 for comparison with the actual power measurement signal n signal n is received from a power transmitter 36 coupled to the motor 37 by shaft 38 comparator 33 produces an output n 39 which is the difference between the signals n and m 39 the power controller 34 senses the difference signal n 39 and provides a corrective signal p which is supplied to the refiner adjusting mechanism 42 it is essential that in combining the two flow and consistency signals that a mass factor be derived from the consistency signal because in obtaining a mass flow signal we are combining flow which is measured from zero to maximum and consistency which is measured from a given minimum consistency to a maximum consistency the consistency signal because of its narrow span and non zero minimum range affects the total mass flow to a much lesser degree than the flow signal the consistency signal is not generated linearly in measurement units and therefore must be compensated for by using the mass factor method described a specific example is given ______________________________________signal k refer to listing of net hpd t vs ratio from that table at a desired net hpd.