SEN68

SEN68 is an environmental sensor node from Sensirion in a housed module package, measuring nine parameters - PM1, PM2.5, PM4 and PM10 particulate matter, temperature, relative humidity, VOC and NOx indexes and formaldehyde (HCHO) - for indoor air-quality monitoring where formaldehyde reporting matters, such as post-renovation checks and new-build handover testing. The formaldehyde channel is the selection point: HCHO limits appear in green-building and materials-emission specifications, and the SEN68 reports it from the same node as the particle and gas indexes instead of a separate electrochemical sensor with its own drift and replacement cycle. Selection advice: the SEN68 has no CO2 channel - if your specification needs CO2 and formaldehyde together, the platform top is the SEN69C; for CO2 without formaldehyde take the SEN66, and for VOC/NOx without HCHO the SEN65 is the step down. Match the full SEN68 code; SEN6x members are not firmware-interchangeable. Parameters verified against Sensirion documentation.