Intelligent pH measurement and control system and pH measurement and control method

Abstract

The invention discloses an intelligent pH measurement and control system and a pH measurement and control method. The intelligent pH measurement and control system comprises a pH controller, a pH real-time data acquisition and curve recorder, an upper computer, a reaction container, an acid bottle, an alkali bottle, an acid dosing pump, an alkali dosing pump, a lower-limit relay, an upper-limit relay and a pH combined electrode arranged in the reaction container and used for detecting the pH value of a solution in the reaction container. The acid dosing pump and the alkali dosing pump are both peristaltic pumps. The alkali dosing pump is used for pumping alkali liquor in the alkali bottle into the reaction container. The acid dosing pump is used for pumping acid liquor stored in the acid bottle into the reaction container. The controller controls the alkali dosing pump to supplement the alkali liquor to the reaction container through the lower-limit relay and controls the acid dosing pump to supplement the acid liquor to the reaction container through the upper-limit relay so that the pH value in the reaction container can approach or reach a certain set pH value and be rapidly constant at the pH value. The intelligent pH measurement and control system and the pH measurement and control method are easy to implement and high in control accuracy.

Description

technical field [0001] The invention relates to an intelligent pH measurement and control system and a pH measurement and control method. Background technique [0002] In the domestic and foreign markets, various pH measurement and control systems for industrial use are very popular. However, there are no advanced small-scale pH measurement and control systems suitable for laboratories in the domestic and foreign markets. Among the many existing pH measurement and control system products, the simple device of the measurement and control system is simply constructed by using one pH controller and one or two simple liquid pumps. That is, the speed of the liquid pump is fixed, and the control method is limit ON / OFF. [0003] After searching, the existing pH controllers generally adopt the working mode of adding acid or alkali alone, such as the acid-base neutralization controller with application number 200910116101.4, which realizes pH value adjustment based on pid and fuzzy ...

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Problems solved by technology

[0003] After searching, the existing pH controllers generally adopt the working mode of adding acid or alkali alone, such as the acid-base neutralization controller with application number 200910116101.4, which realizes pH value adjustment based on pid and fuzzy control, and the debugging and control process is complicated , a pH controller whose application number is 201320744260.0, the main function is only to measure the pH value, and cannot realize the control of the pH value

[0004] The publication number is CN1598729A, the solution pH value automatic adjustment control system and its automatic control method (application number 200410043812.0), which has a pH value acquisition and temperature acquisition circuit, as well as a liquid addition pump and a heater, which are used to adjust the pH value and temperature respectively. However, the control method itself is very simple, and it adopts the limit control method, the control accuracy is low, and it belongs to the extensive control method, which cannot meet the requirements of users in many cases.

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