... accuracy2. Automatic calibration, automatic check3. Automatic check for HC residual4. Equipped with air cleaning system, clean the sampling ... 122-2000 for ASM testing equipment Main specificationsMeasuring range:HC: 0 to 10,000 ppm volCO: 0 to ... rangeIndication errorAbsolute errorRelative errorHC0~2,000 ppm vol±4 ppm vol±3%2,001~5,000 ppm ... ±0.1% vol±5%NO0~4,000 ppm vol± 25 ppm vol±4%4,001~5,000 ppm vol ± ...