Oxygen probe carbonization: Adjust the air flow for carbonization to 10~20 SCFH, equivalent to 5~10 L/min, and control the flow time to reduce the oxygen probe's potential value to below 200mV during carbonization. The carbonization duration should not exceed 90 seconds to prevent excessive temperature rise in the oxygen probe. The temperature of the oxygen probe should not exceed the furnace temperature by more than 100F (38℃). The furnace temperature during carbonization is typically maintained around 850℃. For 0.1%~0.5% CP treatment, perform once a day with carbonization for 60~90 seconds. For general carburization, no more than 2 times a day. For continuous furnace carbonization, recommend 1~2 times daily with an interval of 12~24 hours. For box furnace carbonization, carbonize once per batch. If the frequency exceeds the recommended times, shorten each carbonization session to 60 seconds.

1. Reference Air Flow Check: 100~1000 ml/min; flow rate and pressure (not exceeding 2 psi) must be stable with no leaks. The reference air should be clean; contamination, water, oil, or corrosive gases can damage the oxygen probe. Charcoal Air Flow Check: 5~10 L/min; no air leakage is allowed when the oxygen probe is not being charred. Leakage can cause the oxygen probe's carbon potential to rise abnormally. Short the positive and negative poles of the oxygen probe for 5 seconds, then separate the poles and observe for 1 minute. If the potential recovers to within 10mv of the short-circuit value, it is normal; otherwise, carbonize the oxygen probe.