{"title":"Gravity SFA40 Formaldehyde (HCHO) Sensor","handle":"gravity-sfa40-formaldehyde-hcho-sensor-0-1000-ppb-high-accuracy-20-ppb","url":"/products/gravity-sfa40-formaldehyde-hcho-sensor-0-1000-ppb-high-accuracy-20-ppb","description":"This Gravity-series module is a high-precision electrochemical sensor for monitoring formaldehyde (HCHO) in indoor air. It is built around Sensirion’s SFA40 sensing chip and is designed to selectively detect HCHO while reducing false readings from common household vapours such as alcohol or perfume.An integrated SHT4x temperature and humidity sensor provides real-time environmental compensation, helping the module maintain stable readings across different indoor conditions. It can output HCHO concentration alongside temperature and humidity data for richer air-quality monitoring projects.The Gravity I2C interface makes it straightforward to connect to Arduino-compatible boards and other microcontroller platforms. It suits smart home monitors, HVAC systems, air purifiers, ventilation controllers and experimental environmental sensing setups.Included in the box are the Gravity: SFA40 HCHO Sensor and a Gravity 4-pin sensor cable.Features:Sensirion SFA40 electrochemical formaldehyde sensing chipHigh sensitivity with detection threshold down to 20 ppbMeasurement range up to 0–1000 ppbExtremely low cross‑sensitivity to ethanol (<0.3%) to prevent false alarmsIntegrated SHT4x sensor for temperature and humidity compensationSimultaneous output of HCHO concentration, temperature, and humidityGravity I2C interface for easy integration with microcontroller platformsSuitable for smart home, HVAC monitoring, and environmental researchSpecifications:Typical accuracy: ±20ppb or ±20% m.v (@0~200ppb measurement range)Wide measurement range: 0–1000 ppbLow cross-sensitivity: Cross-sensitivity to ethanol ＜0.3%Supply Voltage: 3.3–5VOperating Temperature: 0~50℃Operating Humidity: 10~90%R.HOperating Current: 80μA(Average@2Hz), 2mA(peak)Size: 32 * 22mmA compact choice for makers and developers building indoor air-quality instruments, portable inspectors or automated ventilation responses.","vendor":"DFRobot","product_type":"Air Quality Sensor","in_stock":false,"options":[],"variants":[{"id":15829,"title":"Default Title","sku":"DF-SEN0661","mpn":"SEN0661","price":121.7,"on_sale":false,"in_stock":false,"available_quantity":0}]}