The SFA30 is Sensirions new digital formaldehyde sensor designed for easy integration into air purifiers, demand-controlled ventilation systems, or indoor air quality monitors.
What is Formaldehyde?Formaldehyde (chemical formula H2-C=O or often HCHO) is a colorless gas and the simplest organic molecule containing C, O, and H. It is highly reactive and has several natural and man-made sources. Formaldehyde concentrations are much higher indoors than outdoors and hence formaldehyde is qualified as a very specific indoor pollutant.
CMOSens Technology for Formaldehyde Sensing

The SFA30 is based on an amperometric electrochemical measurement principle enabling lowest cross-sensitivity and an excellent long-term stability. At the working electrode, formaldehyde is decomposed and an electrical current flows between the counter electrode and the working electrode. The current is proportional to the formaldehyde concentration. Thanks to the Sensirion-specific chemistry the sensor is selective to formaldehyde with respect to other VOCs.
Key Features

Low cross-sensitivity to ethanol
Long-term stability and 6 years service life time
Patented electrochemical cell with anti-dry technology
I2C/UART interface with lifetime-calibrated output
Fully temperature and humidity compensated via Sensirion RHT sensor

Resources

Datasheet Formaldehyde Sensor SFA30
Design-in Guide Formaldehyde Sensor SFA30
Handling Instructions Formaldehyde Sensor SFA30
Description I2C Interface Formaldehyde Sensor SFA30