Exhaust gas analyzer NHA-402/502 Features: Portable design, in line with the national standard ISO 3930 and the international OIML R99 0 level precision; can detect multi-mode dual-idling automobile exhaust HC, CO, CO2, O2, NO concentration; high large-screen LCD brightness, button / menu key corresponding to type a boot operation; can be natural gas (CNG), liquefied petroleum gas multi-fuel vehicles (LPG), ethanol and other testing; with the license plate number of the input / time display and data storage 700 groups. U disk data can be stored and timely movement of data communication transmission function; speed measurement standard inductive clamp; with 3 minutes preheat fast measurements. Exhaust gas analyzer NHA-402/502 Technical Data: Measuring range: HC: 0 ~ 9999 × 10-6 (n-hexane equivalent) CO: 0 ~ 10 × 10-2 (%) CO2: 0 ~ 18 × 10-2 ( %) O2: 0 ~ 25 × 10-2 (%) NO: 0 ~ 5,000 × 10-6 (NHA-402 type is not supported) Indication error: HC: ± 10 × 10-6 (absolute error) or ± 5% (relative error) CO: ± 0.03 × 10-2 (%) (absolute error) or ± 5% (relative error) CO2: ± 0.5 × 10-2 (%) (absolute error) or ± 5% ( relative error) O2: ± 0.1 × 10-2 (%) (absolute error) or ± 5% (relative error) NO: ± 25 × 10-6 (absolute error) or ± 4% (relative error) (NHA-402 type is not supported) Warm-up time: 8min (3min emergency detection can be preheated) Response time: less than 10s, NO not more than 15s Power: AC220V ± 10% 50Hz ± 1Hz or DC12V (optional car power inverter) Operating temperature: + 5 ℃ ~ + 40 ℃ Humidity: 5% to 95% [non-condensing] Weight: 9Kg Dimensions: 310mm (width) × 230mm (height) × 485mm (depth)