Automatic Dosage system consists of weighing module, junction box, weighing instrument, wiring cabinet, PLC control cabinet, the main hardware consists of two computers, high performance microcomputer controllers, human-computer interface, high speed and high precision weighing unit and international famous low-voltage electrical appliances, combined with self-developed professional control software to realize the dosage system for chemical liquid production; at the beginning of each dosage cycle, the difference between the dosage quantity set before and actual dosage quantity is taken as the compensation value to eliminate the cumulative error of dosage quantity set in this cycle. At the beginning of each dosage cycle, the difference between the previously set dosage amount and the actual dosage amount will be taken as the compensation value of the set dosage amount in this cycle, so as to eliminate the cumulative error of the dosage amount of each scale.

Feeding system is to add two or more kinds of materials to the reaction tank automatically and quantitatively according to a certain weight ratio, and the stirring motor will be turned on and off after a specified time. When the stirring motor is closed, the gear pump is ready to send materials to the tank under the drive, the weight generated by the weighing module and weighing instrument, the weight signal generated by the weighing instrument is amplified by the amplifier module and then collected by the PLC and the computer, and when it reaches the predetermined weight, the PLC drives to close the pneumatic valve, and the dosing process is completed once. After mixing to meet the predetermined requirements of the process of automatic discharge. At the beginning of each dosage cycle, the difference between the previously set dosage amount and the actual dosage amount is taken as the compensation value of the set dosage amount in this cycle, in order to eliminate the accumulated error of the dosage amount of each scale.

The main hardware of the weighing control system consists of two computers, high-performance microcomputer controllers, human-machine interface, high-speed and high-precision weighing units and internationally famous low-voltage electrical appliances, combined with self-developed professional control software to realize the dosage system for the production of chemical liquids; the setting of "automatic" and "manual" working modes. The two working modes of "automatic" and "manual" are set up: "manual" work is to complete a certain control link alone, such as "feeding", "mixing" and "discharging" alone. "Discharge", allowing the use of "pause/continue" key to pause, allowing the pause state to modify the parameters; "automatic" work is to complete a complete cycle of control cycle, including feeding, mixing, discharging and so on. Automatic" work is to complete a complete cycle control cycle, including feeding, mixing, discharging and other links, "automatic" operation only allows "pause/continue" key is valid, the "manual" key is invalid, and can not modify the parameters;

Immediate stop function: when the "stop" key is valid, any control process will stop and return to the weight display state; zero function: press the "zero" key under the weighing state to return the display value to zero, if it exceeds the range of zero, it can not be set and display the error message; tare; tare and continue; the "manual" key is invalid, and the parameters can not be modified. If the zero setting range is exceeded, it will not be able to set zero and error message will be displayed; with tare function: press the "Tare" key in weighing state to deduct the displayed weight as tare weight, and then press the "Tare" key again to restore the original displayed weight.