• The return value is 2 bytes wide unsigned NH3 in air concentration value, the unit is 1 ppm, the resolution is 0.1 ppm (100 ppb), and the range from 0.0 ppm to 6,553.4 ppm. Value 0xFFFF (i.e. 6,553.5 ppm) specifies a sensor error.
• FRC 2-byte: FRC return value is the NH3 concentration value +4 (i.e. 0x00A4 = 164 is 16.0 ppm). Because of FRC predefined values the raw values from 0xFFFC to 0xFFFF (i.e. 6,553.2 ppm to 6,553.5 ppm) cannot be passed.