Team pHFine Scale By Ethan Kurteff * In the blue tank, an artificial seawater solution (8.05 pH) is mixed. This and distilled water are added > here 8.05 pH * The solution is distributed to the yellow and purple tanks, with the help of pumps (shown in brown) where it is mixed with hydrochloric acid, and sodium hydroxide to create a relatively acidic solution(7.10 pH) and a relatively basic solution (9.20 pH), respectively. HCLNaOH 9.20 pH 7.10 pH * Each of these three solutions are pumped into the orange tank, where they, one after another, have their pH and temperature measured to extreme precision with a colorimetric pH sensor, and team pHFine scale's glass electrode sensor. This is repeated for a slightly warmer version of each solution, to give a basis for temperature compensation, for a total of six independent measurements. 1st 2nd 3rd Each solution is drained after measurement Colorimetric pH sensor Glass Electrode Sensor Induction heaters raise the temperature of each solution by a few degrees, after the initial three measurements are taken * The colorimetric sensor uploads its data to the glass electrode sensor, to give it a basis for calibration. A Bluetooth transmitter (the black box) logs data, such as number, time and ID of sensors calibrated, to a smartphone, which then uploads it to a data logging server. Alternatively, a direct internet connection could be utilized. Waste Tank Bluetooth Transmitter Data To Smartphone Calibration Data Transfer Glass Electrode Sensor Artificial Seawater Solids Distilled Water HCl NaOH Calibration Data Transfer Temperature is raised slightly by internal induction heaters Calibration Data Transfer Process is repeated with the increased temperatures Calibration Data Transfer Data Broadcast To Smartphone * Description and 3D model available at: