cells not shown each having individual torque transducers two of which 30b and 30h are briefly indicated the electrical output from torque transducer 30 is indicative by its frequency of the rotation rate of the rotor 21 and by its duty cycle of the torque required to drive rotor 21 at that rotation rate the electrical outputs of all the torque transducers are applied to a time division multiplexing unit 45 which takes the information from each torque transducer and seriatim feeds the corresponding individual pieces of information to the computer interface 50 the computer interface 50 controls the sequencing of the multiplexing unit 45 by 34 polling 34 it that is by indicating to the multiplexing unit 45 which particular piece of information it wants at a particular time at which time it accepts the information and feeds it to the microcomputer 60 in the prototype embodiment the well known 34 apple ii plus 34 computer was used but any other general use type computer may be used the computer 60 has a number of the customary peripherals adapting the monitoring system for different purposes low cost cassette storage 61 and high speed disk storage 62 are provided permitting information or data to be retained and operated upon a video monitor 63 is provided for visual read out of data and a printer 64 for hard copy print out out of data an alarm 65 sounds if any of the data indicates an abnormal condition such as excessive build up or zero rotation rate for rotor 21 finally a time sharing computer link 65 for manipulation and storage of data beyond the capacity of the low cost system illustrated is provided the various portions of the deposit build up monitoring system.