Issues such as microcoulomb electrolytes, bias voltage, and overshoot peaks – I’m a newcomer seeking advice from experts; thank you very much

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Regarding the sulfur testing of light oil, is there any experienced expert who can help me resolve my doubts? Thank you. 1. Under what circumstances is it necessary to replace the electrolyte? 2. When replacing the electrolyte, under what conditions can one switch from the balance mode to the operating mode? The bias voltage of the instrument I’m using keeps decreasing slowly in balance mode, which is confusing. 3. If the peak of the input standard sample exceeds the limit, what should be done? Should the bias voltage be adjusted further to bring the peak back to the baseline? But that would require adjusting the bias voltage to between 140 and 130. 4. When measuring high sulfur levels (above 100), an overshoot peak occurs every time, which greatly affects the progress; what should be done? 5. The glass tube in the section connecting the electrolytic cell to the cracking tube has turned a bit black – is this normal?