DEVICE FOR DOSING FLOTATION AGENTS Russian patent published in 2002 - IPC

FIELD: automation engineering. SUBSTANCE: device has N channels each having comparator unit, amplifier unit and electromagnetic reagent-dosing unit, triangular voltage generator, triangular voltage amplitude restriction input of which is connected to reference voltage source output, switching unit. Resistor-type set-point device is introduced into each dosing channel joint inputs of which are connected to movable switch contact member, two fixed switch contact members being connected to the reference voltage source and to external input signal, respectively. Amplitude detector unit the first diode and capacitor and the second diode are introduced into each dosing channel. Joint inputs of the first diodes are connected to pulsating voltage source (transformer unit). Amplitude detector output is connected to electromagnetic dosing unit by means of the amplifier and to the second diode the second output of which is connected to common device potential. EFFECT: wide range of functional applications; eliminated radio noise influence; low maintenance costs. 2 cl, 3 dwg