Hi, I'm trying to understand how an amperiometric cell with 3 electrodes(working, reference, counter. All of them inside a electrolyte) works. Till this point I get that when a gas reaches the working electrode a redox reaction happen and then it release electrons or charges that would cross through an external circuit to the counter that will make the opposite reaction to consume produce electrons. I can't reach to understand what is the reference electrode or why it has to have a fixed potencial, or why the bias potential should be 0 between working and reference. Summing up, is there anyone who has some information or knows where to find information about how an amperiometric sensors works internally(works very specifically). Cheers!