Should a reference sampling port be reserved downstream on the opposite side for CEMS monitoring? Why is this?
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HJ75 stipulates that a sampling port for the reference method should be provided downstream of the CEMS monitoring section. Why is such a provision for an artificial sampling hole in place?
The CEMS monitoring system is primarily used to monitor the concentrations of pollutants in industrial exhaust emissions. During monitoring, to ensure the accuracy and reliability of the results, it is necessary to calibrate the reference method. The requirements for the sampling port reserved downstream of the CEMS monitoring section for the reference method are intended for the calibration of that reference method. The sampling port of the reference method is a manually created hole used to collect exhaust gas samples from downstream of the same cross-section, which are then compared with the data obtained in real time by the CEMS monitoring system. By comparing the results of the two, it is possible to determine the accuracy and stability of the CEMS monitoring system, as well as the actual emission levels from the source. This ensures the reliability of the monitoring results, as well as the timely detection and correction of deviations in the CEMS monitoring system. Therefore, HJ76 stipulates that a sampling port for the reference method should be provided downstream of the CEMS monitoring section, in order to ensure the accuracy and reliability of the CEMS system’s measurement results as well as the true conditions of the exhaust gas emission sources. .