The 2nd and major category of uses of automatic control in the chemical and allied businesses is that concerned with batch production.
Most processes start as batch operations because of their flexibility and reduced prices, particularly when the knowledge of all the variables is sketchy. To research additional information, please consider having a look at: tell us what you think. Some batch processes may be transformed into the continuous variety after many years of operation under various conditions. This is desirable, since normally batch production depends significantly on the standard of supervision, and it results in capital equipment and factory space not being used with complete efficiency. The item is, thus, to enhance oversight and make better use of the space and gear. These objectives may sometimes be accomplished by the installation of automatic quality control and automatic sequencing. The prior relies heavily on negative feedback control with proper sensors and actuators, though arrangements should be made for the human operator to take over at critical moments. The latter involves automatic sequencing of consecutive stages, so that all phases are used almost simultaneously and the reactants are transferred from one stage to the other without delay; sequencing is achieved by a unique switch called a sequencer, similar to the 'uniselector' used in telephone exchanges.