Title :
Design and implementation of a submerged capacitive sensor in PID controller to regulate the concentration of non-denatured ethyl alcohol
Author :
Rivai, Muhammad ; Suwito, Masaji ; Chondro, Peter ; Shanq-Jang Ruan
Author_Institution :
Dept. of Electr. Eng., Inst. Teknol. Sepuluh Nopember, Surabaya, Indonesia
Abstract :
Ethyl alcohol (ethanol) is one of the most common organic compounds used in medical and industrial applications. Because of its human amiability, ethanol has become a perfect solvent for organic matter with varying concentration levels for different purposes. Nevertheless, ethanol has a unique character that makes it evaporates at a level of temperature, which is called flash point. Storing ethanol above its flash point would reduce its concentration as well as its functionality. In this research, a device has been developed to control ethanol concentration in water. The concentration of ethanol is measured based on the signal of a square wave oscillator connected to a cylindrical aluminum capacitive sensor. Thus, the output frequency is imputed to a microcontroller programmed as a PID controller to produce the control signals that are used to operate two peristaltic pumps connected to two reservoirs containing non-denatured ethanol and distilled water, respectively. Magnetic stirrer is added to improve the dilution process. Overall, the designed sensor is able to identify various levels of ethanol concentration from 0.0-0.9 m3/m3. Furthermore, the implemented controller is capable to maintain the volumetric concentration of ethanol with set point ranging from 0.0-0.5 m3/m3 within 90% of success rate.
Keywords :
capacitive sensors; chemical sensors; chemical variables control; chemical variables measurement; control system synthesis; microcontrollers; organic compounds; oscillators; pumps; three-term control; PID controller; concentration levels; concentration measurement; control signals; cylindrical aluminum capacitive; dilution process improvement; distilled water; ethanol concentration control; evaporation; flash point; functionality reduction; magnetic stirrer; microcontroller; nondenatured ethanol; nondenatured ethyl alcohol concentration regulation; organic compounds; organic matter; output frequency; peristaltic pumps; reservoirs; solvents; square wave oscillator; submerged capacitive sensor design; submerged capacitive sensor implementation; volumetric concentration; Actuators; Capacitance; Capacitive sensors; Ethanol; Inductors; Oscillators; Temperature measurement; capacitive sensor; concentration controller; digital PID; ethyl alcohol;
Conference_Titel :
Intelligent Technology and Its Applications (ISITIA), 2015 International Seminar on
Conference_Location :
Surabaya
Print_ISBN :
978-1-4799-7710-9
DOI :
10.1109/ISITIA.2015.7219951