DESIGN OF WATER QUALITY MEASURING INSTRUMENT BASED ON TURBIDITY, TOTAL DISSOLVED SOLIDS, AND pH VALUES

Abstract

Drinking water is water that has been through a processing process or without a processing process that meets health requirements and can be directly drunk. Drinking water requirements in Indonesia are regulated in the regulation of the Minister of Health of the Republic of Indonesia in Permenkes RI Number 492/MENKES/PER/IV/2010. Three of several mandatory parameters to meet the requirements for drinking water quality are turbidity levels, total dissolved solids (TDS), and pH values. In addition, this tool can also be used to determine the quality of RO water in hemodialysis equipment and calculate its content values ​​based on the three sensors used. The purpose of this study is to develop a water quality measuring tool consisting of three parameters but contained in one tool. This tool uses a turbidity sensor, a TDS sensor, and a pH sensor with a 20x4 LCD as a display of the test results. Sample testing uses 4 types of samples: distilled water, bottled drinking water, refilled depot water, and RO water from hospitals for hemodialysis equipment. The accuracy of pH sensor measurements with a pH 6.86 buffer solution was 97.38%, TDS sensor with a standard solution of 342 PPM was 79.65%, and turbidity sensor with a standard solution of 0 NTU was 100%. The results of the test have been able to classify water into categories that meet quality and do not meet quality.