Model Number: DW servo Brand Name: Dong-il M.T Key Specifications/Special Features: Auto-control by the input signal (diversity): able to controldischange volume of metering pump automatically by the input signalof flow, pH, turbidity and more (DC 4 to 20mA/+1 to + 5V)The whole type servo unit (convenient): sealed off by the wholetype protctive cap with automatic controlling circuit and servomotor on the pump, accordingly, it's showing maximized function atindoor and outdoorVarious controlling mode (fixed quantity): possible is possibleto control widely with inverter, not only transfer of fixedquantity but also most suitable at violent site of variation ofoperating conditionProtective function for servo motor (durability): equippedclutch lever separately, so it gives protection of damages from theservo motor when have continuous operation of auto/manualHandiness of system (simplicity): possible to do simpleinstrumentation work because feedback an the other wiring are notnecessary