Low-cost metering device for automatic mixing of nutrient solution

This study Mas conducted to develop a low-cost, precise metering device for automated nutrient-solution mixing systems. The metering device consisted of a supply pump, cylinder level sensors, and a solenoid valve. The level o f solution irt the cylinder was kept constant to maintain a uniform dischar ge rare. The supply anti discharge of the solution was controlled with a mi crocomputer Test results indicate that the deviation in accuracy for the fo ur metering devices developed was +/-0.3%, which is significantly less than that of commercial metering pumps.