Automated precise liquid transferring system

Nearly all chemical, pharmaceutical, food processing and bio medical industries require large volumes of liquid transfer. With automation technology, the capacity, easiness and efficiency of liquid transferring systems has been greatly enhanced. Precision and accuracy in the volume of liquid dispensed plays a vital role in determining the overall efficiency of the industrial processes. An automated precise liquid transferring system targets replacement of the conventional erratic flow meters and highly expensive flow sensors used in the industries. This non-contact system enhances the overall efficiency of liquid transferring process in a very cost effective manner. The system control was implemented through Unitronics PLC and the noncontact mechanism of liquid dispensing was designed with the help of solenoid valves, relays, FRL and various other devices. The liquid was initially pressurized for a pre-defined time and the precisely dispensed by regulating the opening and closing time of solenoid valves. Provision for liquid transfer to demanded mixture tank is also provided. Flow rate of the liquid and the on- off time for solenoid determines the volume of liquid transferred. Experiment carried out for different volumes of liquid showed an accuracy of 1–2 gm. Using the PLC control and automation, the time required for the entire process of liquid dispensing was brought down to few seconds irrespective of the volume of the liquid dispensed.