• The return value is 2 bytes wide unsigned O3 concentration value, the unit is 1 ppm, the resolution is 0.0001 ppm (0.1 ppb), and the range from 0.0000 ppm to 6.5534 ppm. Value 0xFFFF (i.e. 6.5535 ppm) specifies a sensor error.
• FRC 2-byte: FRC return value is the O3 concentration value +4 (i.e. 0x0138 = 312 is 0.0308 ppm). Because of FRC predefined values the raw values from 0xFFFC to 0xFFFF (i.e. 6.5532 ppm to 6.5535 ppm) cannot be passed.