Formaldehyde sensors are used for gas detection in home renovations

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Formaldehyde pollution has become a very common source of contamination in living environments, and it can be encountered during home renovations, the purchase of new cars, furniture replacements, and in office settings. It is especially more likely to cause harm to pregnant women, children, and the elderly. Formaldehyde is a colorless, irritating gas. Typically, during the renovation of a new house or the installation of new furniture, there are large amounts of gases such as formaldehyde. Formaldehyde is irritating to the human eyes and nose, and large amounts of formaldehyde gas pose an even greater threat to the human body. Therefore, to detect formaldehyde in indoor environments, devices equipped with formaldehyde gas sensors are often used for such testing. Ordinary sensors can detect total volatile gases, that is, unusual odors in the air ； Professional formaldehyde sensors are designed specifically to detect the level of formaldehyde in the air, allowing for a more accurate measurement of its concentration. According to **standards, a formaldehyde level in the air of 0.01 mg/m2 or less is considered normal. Working principle of formaldehyde sensors: Formaldehyde sensors are a subset of gas sensors, and their working principle is based on chemical electrode reactions. Formaldehyde sensors primarily use four-electrode electrochemical sensors, which include a working electrode and active auxiliary electrodes. The signals that can be generated by the auxiliary electrode and the main electrode are primarily used for temperature compensation, and they can usually be employed to enhance the selectivity of the entire sensor. Formaldehyde and oxygen undergo corresponding redox reactions at the working electrode and the counter electrode, releasing charge to generate an electric current; this current is proportional to the concentration of formaldehyde. The concentration of formaldehyde can be determined by measuring the current. When the concentration of formaldehyde gas in the environment exceeds the set value, an alarm equipped with a formaldehyde sensor will emit a warning signal to enable safety measures to be taken. Gongcai.com acts as an agent for the German EC Sense TB600B formaldehyde sensor. It features high precision, a long service life, fast response times, quick zeroing, plug-and-play functionality, good resistance to poisoning, and UART digital signal output, eliminating the need for complicated calibration processes and enabling accurate monitoring of formaldehyde levels. There is also the HCHO formaldehyde sensor ES4-HCHO-100, which features an extremely linear response at high concentrations; it requires separate calibration and comes with a test report, plus it has no electrolyte leakage.