PH water quality analyzer system and control method thereof

Abstract

The invention discloses a PH water quality analyzer system which is characterized by consisting of a controller module (1), a pH electrode (2), a PH signal data processing module (3), a temperature acquisition module (4), a power supply module (5), an RS485 communication module (6), an RS232 communication module (7) and an expansion module (8). A control method of the PH water quality analyzer system is characterized by comprising an initializing subprogram, an A / D conversion and sampling subprogram, a control algorithm subprogram and a communication subprogram in sequence. In a PH signal processing circuit, a one-step low-pass filter circuit is adopted to effectively filter out ripples, so that the data acquisition accuracy is improved; for the conventional PH meter, the data transmission speed is low; by the adoption of an STM32F103 series microprocessor produced by the ST Microelectronics to realize 32-bit data serial processing, the data processing speed is increased, and the real-time transmission of data is guaranteed.

Description

technical field [0001] The invention relates to the technical field of pH water quality analyzers, in particular to a pH water quality analyzer system and a control method thereof. Background technique [0002] Secondary water supply is the "last mile" of water supply for high-level users. Due to unclear management entities and even unmanned management, it is difficult for many management units to ensure regular cleaning and disinfection of secondary water supply facilities. In addition, due to the characteristics of the secondary water supply facilities, such as facility materials, water storage time, external environmental conditions and human influence, secondary pollution is easily generated, which affects the drinking water safety of water users within the water supply range. [0003] In view of the above situation, our company decided to develop a modular secondary water supply water quality monitoring instrument, and configure corresponding sensor probes according to ...

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Problems solved by technology

[0002] Secondary water supply is the "last mile" of water supply for high-level users. Due to unclear management entities and even unmanned management, it is difficult for many management units to ensure regular cleaning and disinfection of secondary water supply facilities.

[0006] Domestic research on pH control mainly focuses on the theoretical research of pH control theory and advanced control algorithm: Yang Cuirong, Zhang Yuqing and others proposed an intelligent pH controller based on the pH control strategy of fuzzy neural algorithm in 1997, and Theoretical analysis and digital simulation have been carried out, but the control object is only for a given neutralization reaction process, and its algorithm is complex and cannot be realized in actual engineering; Shang Jiandong and Chen Kangning aimed at the problem of pH value control in pesticide production A fuzzy pH value controller based on the expert knowledge base was developed. In the application process, a large number of experiments need to be done, and a large amount of empirical data is collected to form a knowledge base. The change of the control object needs to complete the data collection again, and the applicability is poor; Wang Wei in the pH value control In the study, the multi-model adaptive control algorithm was used to complete the research on the control strategy; Sun Xi et al. used bilinear as the reaction mechanism model of the pH value control process, and proposed a bilinear adaptive control algorithm to solve the crystallization process in chemical production. The problem of pH value control in wastewater treatment: Zhao Yanhua and others studied the method of combining fuzzy feedforward control and variable gain PID to solve the problem of pH value control in wastewater treatment process

So far, most of the PH value measurement and control devices used in industrial production sites in my country are still based on PLC or embedded single-chip microcomputers. Through simple single-loop controllers, or combined with cascade control and feedforward control algorithms, there are often problems with low control accuracy and poor structure. Complicated, poor stability and other disadvantages

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