THE CONDUCTIVITY METER DESIGN USING A CAPILLARY TUBE PROBE TO MONITOR MILK QUALITY

• Main Author: ZULFIKRIDIN (NIM: 90216009), DICKY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26643
• Institution: Institut Teknologi Bandung

Instrumentation design has been done to monitor the quality of raw milk using electrical conductivity measurement method. In this research, conductivity meter is designed using four probe method on capillary pipe. This capillary pipe technique has relatively long current path and narrow so that the distribution of the current evenly. Electrical conductivity measurements are made by utilizing a constant DC (DC) current source which is connected to two electrodes and another electrode as an electric voltage meter from a raw milk sample via the Arduino ATmega 2560 microcontroller. Calibration of the cell constant on four probes using standard solution KCl 0, 1 M and 0.01 M which have known electrical conductivity value based on the calibration document of OIML R56 edition 1981 and ASTM D1125-95 calibration document. Recording data of electrical conductivity through a capillary pipe method may show a reliable and generally accepted record of the quality of milk monitoring. The data of electric conductivity of raw milk decreased in monitoring for 1 - 2 days. At a value below 0.460 S / m suspected raw milk has begun to decline in quality. Very rapid changes in electrical conductivity values are expected to occur in the initial phase at 3 hours of initial measurement and reach saturation when monitoring is performed over 24 hours. The curve starts to look horizontal at 16 hours after the monitoring. The presence of saturation values on monitoring of electrical conductivity records data can be attributed to the alleged bacterial activity affecting the fat, protein and salt content of raw milk through a particular process. It is expected that this tool can be developed further as a physical test tool in determining the quality of other food on the market.