SKA/ CIMS-SD-A type tracing tube hygrometer module (dry and wet oxygen method) adopts international advanced solid state electrolytic ceramic sensing dry and wet oxygen measurement technology, the core sensor adopts high temperature resistance structure design, the maximum temperature resistance can reach 900℃, can work stably in high temperature environment for A long time; The product has the characteristics of high temperature resistance, high measurement accuracy, strong corrosion resistance, fast response speed and stable and reliable performance. It can be installed in the interior of the hot and wet flue gas CEMS heating box and the interior of the cold and dry flue gas CES cabinet, and can be applied to the continuous online measurement of humidity and oxygen in the flue gas under different working conditions, meeting the technical requirements of online monitoring of flue gas humidity and oxygen in HJ75-2017 and HJ76-2017 standards. SKA/ CIMS-SD-A trace tube hygrometer module (dry and wet oxygen method) is an intelligent humidity transmitter with microprocessor as the core and variable frequency ion humidity sensor as the measuring unit. The SKA/ CIMS-SD-A trace tube hygrometer module (dry wet oxygen method) can be installed at the outlet of the CEMS sampling trace line. When the flue gas flows through, it diffuses into SKA/ CMS-SD-A, measures the humidity of the flue gas, and outputs the humidity signal through 4-20mA or RS232.