can be counted to provide a temperature indication in system ap 1 receptors 15 have identical thermo sensors 95 alternatively thermo sensors with different ranges can be used depending on the target temperature for the associated station this reduces the dynamic range required of the sensors and permit greater precision in controlling temperature alternatively more sophisticated sensors can be used to provide range and precision at one extreme digital readout thermometers can be included in the receptors an imaging optical reader with optical character recognition ocr capabilities can be used to monitor sample temperature signal flow for system ap 1 is shown in fig3 controller 23 controls centrifuge motor 25 and tilt motor 27 and thus the centrifuge rotation rate and the orientation of each chemical processing circuit relative to the centrifugal force centrifuge motor encoder 43 monitors the orientation of centrifuge motor shaft 39 and indirectly the orientation of centrifuge rotor 11 the actual orientation of centrifuge motor shaft 25 can be compared to the intended orientation any error can be used to adjust the centrifuge rotation rate likewise tilt motor encoder 63 monitors the orientation of tilt motor shaft 51 and indirectly the orientation of each chemcial processing circuit 15 relative to the local centrifugal force controller 23 controls the spin rates of motors 25 and 27 to minimize deviations from expected centrifuge rates and tilts controller 23 also uses the orientation information to determine when a station 81 82 83 is within inductor gap 75 and thus when to fire inductor 19 if additional heating is required if a temperature increase is required inductor 19 generates an alternating magnetic field so that eddy currents yield heat in the receptor in gap.