What form of zirconia is used in the heating furnaces of refineries these days?
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Dear experts, I would like to ask: when it comes to zirconia used for measuring oxygen content in the heating furnaces of refineries, is the sampling type more commonly used or the direct-insertion type? Can a direct-insert type be used in the low-temperature range?
If the temperature is not higher than 750 degrees, plug-in types can generally be used. If the temperature is above 750 degrees, since it exceeds the operating temperature of the zirconia cell, probe types with sample extraction are commonly used.