SEN69C

SEN69C is an environmental sensor node from Sensirion in a housed module package, measuring ten parameters - particulate matter PM1, PM2.5, PM4 and PM10, temperature, relative humidity, VOC and NOx indexes, true CO2 and formaldehyde (HCHO) - over an I2C interface, for indoor air-quality monitoring in HVAC equipment, purifiers and smart buildings. It is the top of the SEN6x platform and the selection point is completeness: it is the only member that combines a true CO2 channel and a formaldehyde channel in the same node as the particle and gas indexes, so one factory-characterised module satisfies monitoring specifications that would otherwise need two separate gas sensors with their own calibration and drift behaviour. Sensirion launched the SEN69C in September 2026, with evaluation through the platform's SEK kit. Selection advice: choose within the platform by parameter set - the SEN66 reports CO2 but no formaldehyde, the SEN68 reports formaldehyde but no CO2, and the SEN65 drops both; only the SEN69C covers the full ten-parameter readout. Match the full SEN69C code, as platform members are not interchangeable in firmware or reported values. Parameters verified against Sensirion documentation.