SKA/ CIMS-SD-D type trace pipe hygrometer module (CR) adopts imported high temperature CR /C temperature and humidity sensor as the measuring unit, with a variety of signal output modes such as 4-20mA/RS232/RS485. The instrument can be integrated with the CEMS system, installed at the outlet of the sampling and tracing pipeline, measure the humidity of the flue gas during the CEMS sampling process, and transmit the data to the CEMS industrial computer through RS232.