An oxygen analyzer is an industrial process analytical instrument primarily used for detecting oxygen content in mixed gases in various industrial processes. It is widely applied in industries such as petroleum, air separation, chemical processes, magnetic materials, protective gases for high-temperature sintering furnaces, protective gases in the electronics industry, and glass and building materials industries. Depending on different operating conditions and processes, oxygen analyzers with different principles are available, including electrochemical oxygen analyzers (also known as fuel cell oxygen analyzers), zirconia oxygen analyzers, magnetoxygen analyzers (also known as paramagnetic oxygen analyzers), and laser oxygen analyzers. Analyzers with different principles have their respective advantages and disadvantages.