DFRobot Gravity SFA40 Formaldehyde (HCHO) Sensor

DFRobot Gravity SFA40 Formaldehyde (HCHO) Sensor is a high-precision electrochemical module created to solve the biggest issue in air quality monitoring: false alarms. The sensor is powered by the Sensirion SFA40 chip, enabling the formaldehyde detector to specifically target HCHO molecules while ignoring common household odors such as alcohol or perfume.

The Gravity: SFA40 Sensor measures HCHO concentrations from 0ppb to 1000ppb with a low detection threshold of 20ppb and an error margin of ±20ppb.

The DFRobot Gravity SFA40 HCHO Sensor includes a built-in SHT4x sensor for automatic temperature and humidity compensation and delivers reliable data for smart home devices, HVAC systems, and DIY air purifiers.

Zero False Alarms: Anti-Interference Design

Standard sensors often spike simply because someone peeled an orange or used hand sanitizer. This electrochemical HCHO sensor solves this by utilizing advanced electrode materials with a cross-sensitivity to ethanol of less than 0.3%. It ensures that a rising reading indicates actual formaldehyde, not just a change in daily household scents.

Integrated Environmental Compensation

To prevent data drift caused by heat or moisture, the SFA40 analysis board integrates an SHT4x sensor. This onboard coprocessor automatically calibrates formaldehyde readings based on real-time temperature and humidity, ensuring consistent readings whether the device is in a damp basement or a dry office.

Laboratory-Grade Sensitivity (20ppb)

Detecting trace gases requires immense precision. The Gravity SFA40 module boasts a detection threshold of just 20ppb. To put this in perspective, finding 20ppb is equivalent to finding 20 grains of rice in 15,600 kilograms of rice. Whether users are tracking faint off-gassing from new furniture or conducting scientific research, this sensor captures minute changes that other devices miss.

Features

Powered by the Sensirion SFA40 chip
Advanced electrode materials with a cross-sensitivity to ethanol of less than 0.3%

Zero false alarms with an anti-interference design
Integrated environmental compensation
Laboratory-grade sensitivity (20ppb)

Applications

Smart home air guardians - build a monitor that alerts you when new furniture off-gases formaldehyde
Automated ventilation - trigger fans or open windows automatically when HCHO levels exceed safe limits (>80ppb)

Smart air purifiers - create a device that only activates filtration when pollutants are actually present, saving energy
Portable health checkers - design a handheld logger to inspect air quality in different rooms or new cars