In the analogical dosing pumps of the OPTIMA series; the flow rate is adjustable in percentage through the potentiometer located under the front panel that modifies the pump operating frequency.
They have a level sensor input.
Double adjustment scale: possibility of dividing the maximum dosing frequency by 5. This double scale allows the user to have two pumps at the same time with a single model.
Power supply from 90 to 230 Vac 50/60 Hz with plug and switch.