Precipitation can block the infrared beam of an open-path IRGA—primarily through accumulation on the windows and by falling through the measurement path. The EC155 is a closed-path IRGA that is protected from rainfall by taking its measurements within a sample cell assembly. Additionally, the EC155 in the CPEC200 has a heated intake assembly with a rain diverter to prevent precipitation from entering the sample cell. However, measurements from sonic anemometers can also be affected by rainfall, especially if droplets accumulate on transducer faces. Therefore, it is important to continue monitoring data during rainfall events to ensure quality measurements are included in final calculations of flux.