• The return value is 2 bytes wide unsigned NO2 concentration value, the unit is 1 ppm, the resolution is 0.001 ppm (1 ppb), and the range from 0.000 ppm to 65.534 ppm. Value 0xFFFF (i.e. 65.535 ppm) specifies a sensor error.
• FRC 2-byte: FRC return value is the NO2 concentration value +4 (i.e. 0x0036 = 54 is 0.050 ppm). Because of FRC predefined values the raw values from 0xFFFC to 0xFFFF (i.e. 65.532 ppm to 65.535 ppm) cannot be passed.