Chlorine Gas Depleted Alarm System for Water Supply Process

Abstract

The objectives of this research were 1) to develop a chlorine gas depleted alarm system for water supply process that meet the operators’ need and selected the suitable sensor to detect the chlorine gas supply status, 2) to evaluate the effectiveness of the chlorine gas depleted alarm system for water supply process, 3) to compare the residual chlorine value in the tap water before and after installing the chlorine gas depleted alarm system for the tap water production process and 4) to assess the satisfaction of users of the chlorine gas alarm system for the water supply production process. The research was conducted by designing the chlorine gas depletion alarm system using ESP8266 as a processor and various types of sensor were evaluated their properties to be used in the system.  The chlorine gas depleted alarm system was installed and sent the alert message of the depleted chlorine status through the Line application. The residual chlorine values in tap water were collected before and after use for four months. Data were analyzed by T-test dependent statistics. Then the satisfactory of operators who used the system was also evaluated.  The results found that infrared sensor was suitable for detect the depletion of chlorine gas and the chlorine gas depleted alarm system sent the alert message through Line application correctly. The average residual chlorine value in the tap water after installing the system was 1.2495 ppm. (SD = 0.16811) which were higher and smoother than before installing the system that was 1.1258 ppm (SD = 0.23631 with the significant level of 0.001. The operators’ satisfaction assessment showed that they had the highest satisfaction on the system at the average of 4.60 points with the system safety for the user, its compliance with operator needs, workload reduction for monitoring chlorine gas and immediately solving the problem of chlorine gas depletion, respectively.