SFA40-D-R3

SFA40-D-R3 is an electrochemical formaldehyde sensor module from Sensirion measuring 10 x 13 x 2.4 mm, covering 0 to 1000 ppb with a detection limit below 20 ppb typical, plus/minus 20 ppb or 20 percent typical accuracy, roughly 80 uA average current, I2C address 0x5D and a lifetime above six years with anti-dry technology and below 0.3 percent ethanol cross-sensitivity. It resolves formaldehyde below the WHO and China GB/T 18883-2022 limits, for air purifiers, air conditioners and indoor air quality monitors. Selection advice: the -D-R3 code is the 1,000-piece reel order form from the official data sheet ordering table (Sensirion part 3.001.251; the -D-R1 code is the 250-piece reel). Parameters verified against the Sensirion SFA40 data sheet D1 v1.1 (April 2026).