DEVICE FOR CONTROLLING WORKING FLUID FLOW THROUGH FIELD SPRAYERS INCORPORATING PROVISION FOR CORRECTION OF SOLUTION CONCENTRATION Russian patent published in 1995 - IPC

FIELD: farm machinery engineering. SUBSTANCE: delivery line of sprayer has acoustic-wave emitter and detector spaced at certain distance apart. Emitter is connected through p-n-p transistor to low-frequency oscillator and through n-p-n transistor, to output of high-frequency oscillator. Detector is connected through shaping amplifier, OR gate, and second inverter to R flip-flop input. Q input of the latter is connected via first inverter to low-frequency oscillator output. Q output of flip-flop is connected to first external input of programmable timer communicating with microcomputer over system unibus. EFFECT: provision for controlling flow rate of working fluid with due account of varying concentration of solution. 10 dwg