Which process is used to measure hydrocarbons during the emissions test?

The process used to measure hydrocarbons during the emissions test is the Exhaust Gas Analyzer (EGA). This instrument is specifically designed to analyze the composition of gases emitted from the vehicle's exhaust system. It captures the exhaust fumes and measures the concentration of various pollutants, including hydrocarbons, carbon monoxide, nitrogen oxides, and carbon dioxide.

The EGA provides real-time data that allows for an accurate assessment of a vehicle’s emissions performance. This tool is crucial in ensuring that vehicles meet regulatory standards for emissions, which is essential for protecting air quality and public health.

While other options, like gas chromatography, are effective analytical techniques in laboratory settings for separating and analyzing compounds, they are generally not used in the direct emissions testing process. Lambda sensor testing measures the air-fuel mixture in the combustion process but does not specifically quantify hydrocarbon emissions in the exhaust. Particle sampling focuses on particulate matter rather than gases, so it doesn't apply directly to the measurement of hydrocarbons.