KUMAR, Ashish; SHARMA, Avinash; KANSAL, Kapil Dev. PLC based System for Measuring Concentration of Oxygen in Mines for Miners Safety with O2 Sensor. International Journal of Advanced Engineering Research and Science, [S. l.], v. 7, n. 12, 2020. Disponível em: https://journal-repository.com/index.php/ijaers/article/view/2910.. Acesso em: 22 jul. 2024.