When it comes to construction in China, it is indispensable to talk about decoration, and the decoration materials of houses are a mixture of various organic compounds. After the decoration of the house, it often needs to be ventilated and left for a period of time before people can go in to work or move in. The reason is that the newly decorated House materials will emit various toxic and harmful substances, such as: formaldehyde, benzene, TVOC, toluene, ammonia, xylene, chlorine, etc. Among them, formaldehyde is the most harmful to the human body and is also the most difficult toxic and harmful gas to get out. The cycle will last from three to fifteen years, which leads to the discoloration of formaldehyde.
Formaldehyde is a toxic and harmful volatile organic compound. Long-term exposure to high concentrations of formaldehyde can cause harm to the human body. Formaldehyde is a colorless gas with a strong pungent odor. It is easily soluble in water and alcohol ethers. It is gaseous at room temperature and usually appears in the form of an aqueous solution. Formaldehyde is a highly toxic substance. Formaldehyde ranks second on China's priority control list of toxic chemicals and has been identified as a carcinogen and teratogen by the World Health Organization. Formaldehyde is also a recognized allergen and one of the potential strong mutagens.
Regarding the harm of formaldehyde to the human body, there are now clear concentration definitions. According to epidemiological survey results, the World Health Organization believes that formaldehyde concentrations below 0.08ppm (0.1mg/m) are relatively safe for the human body. As the concentration of formaldehyde increases, the harmful effects on humans and animals are also increasing. 0.08ppm (0.1mg/m) is also the indoor formaldehyde concentration limit used in most countries. When the indoor air content is 0.1MG/M3, it can irritate the eyes and cause tears; when it is 0.5MG/M3, it can cause throat discomfort or pain; higher concentrations can cause constant nausea, vomiting, coughing, chest tightness, asthma, and even emphysema, Cancer, leukemia; causing death immediately when reaching 30MG/M3. Long-term exposure to low-dose formaldehyde can cause chronic respiratory diseases, female menstrual disorders, pregnancy syndrome (chromosomal abnormalities, reduced physical fitness of newborns, etc.), and even nasopharyngeal cancer. High concentrations of formaldehyde are toxic to the nervous system, immune system, liver, etc.
Formaldehyde sensor is a device that can detect the concentration of formaldehyde in the air. It is widely used in indoor decoration, detection and formaldehyde substance monitoring and other fields. The principle of the formaldehyde sensor is based on chemical reactions. The chemical materials in the sensor will react chemically with formaldehyde in the air. Formaldehyde concentration information can be obtained through the electrical changes of the materials. Different formaldehyde sensors have different sensitivities and response speeds. For different types of formaldehyde environments, sensors with different sensitivities need to be selected, otherwise misjudgments and missed detections may occur. Electrochemical sensors can accurately detect very low formaldehyde concentrations. The detection of formaldehyde itself requires high detection accuracy and a relatively reasonable cost. The British Alphasense ETO-A1 sensor, represented by Shenzhen Xinshilian Technology Co. , Ltd., is a trustworthy choice. The following is the specific parameter information of the sensor:

Measuring range: 100ppm
Sensitivity: 2000 ~ 3200nA/ppm
Response time: <150s
Linear range: 0~40ppm, full range error range 5-10ppm
Overload : 200ppm
Resolution: <0.1ppm
Size: 20.2*16.5
Service life: 2 years
storage Cycle: 6 months
Working temperature : -30~50°C
Working humidity: 15~90%RH
Load resistance : 10~47Q