On August 12, 2003, environmental monitoring of State Environmental Protection Administration carried out the one-week secondary contrast detection for YX-CEMS gas continuous monitoring system installed in the power plant of Chi Hsin Cement Plant  in Hebei and Tangshan:

SO2 and NOX thickness: Linear error ≤0.5%; Zero Excursion ≤±0.23%F.S./day; Range Excursion ≤±0.44%F.S./day; Response time ≤57s; relative accuracy ≤4.7%; Measuring range 0~2000/5000 mg/Nm3.

Dust thickness: Relative error ≤0.4%; Zero Excursion ≤±0.45%F.S./day; Range Excursion ≤±0.10%F.S./day; Response time ≤90s; Measuring range: 0~2000/5000mg/Nm3.

Gas velocity: Precision ≤3.0%; relative error ≤2.4%;

The detected performance index are better than state standards (HJ/T76-2001), and better than the similar products at home and aboard.