The invention discloses a
normal position zero gas back-blowing type CEMS (
continuous emission monitoring system) probe on-line calibration method and device, and belongs to fume on-line
continuous monitoring and calibrating. According to the device, a probe is not extracted, a probe measuring region is provided with a shield, pressure for providing a
system for performing back-blowing is regulated through shielding the probe measuring region, excessive back-blowing is performed on the measuring region, and fume in the measuring region is evacuated; zero air is fully filled in a calibration pond, the zero
creep calibration operation is performed on the
system, the calibration pond is fully filled with range point standard air, and the range drifting calibration operation is performed; the calibration is finished, the calibration pond is filled with the zero air again; and finally, the shield in the measuring region is withdrawn, the
compressed air back-blowing pressure is regulated, and the
system is at a normal measuring condition. The
normal position zero air back-blowing type CEMS probe on-line calibration method and device provided by the invention can perform completed original light path on-line calibration under the condition that the probe is not extracted in a measuring system, and a measuring light path and a calibration light path are completely consistent.