What is a formaldehyde sensor?
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What is a formaldehyde sensor?
Formaldehyde sensor, also called CH2O Sensor, is specially used for the detection of formaldehyde gas and is based on the principle of electrochemical reaction. In the process of house decoration, there is usually a large amount of formaldehyde gas. It is an organic compound, colorless, irritating gas, irritating to human eyes and nose, and extremely harmful to the human body. 2017 On October 27, 2019, the World Health Organization’s International Agency for Research on Cancer published a list of carcinogens, and formaldehyde was included in the list of Class 1 carcinogens. On July 23, 2019, formaldehyde was included in the list of toxic and harmful water pollutants, so the detection of formaldehyde gas is particularly important.
Formaldehyde gas detection methods and principles
At present, the main methods for detecting formaldehyde gas in the home, textile, and food industries at home and abroad include: spectrophotometry, color chromatography, liquid chromatography, phenol reagent method, and electrochemical sensor method. The electrochemical formaldehyde sensor uses a 4-electrode electrochemical sensor, which includes a working electrode and an active auxiliary electrode. The signal from the auxiliary electrode is mainly used for temperature compensation and can usually be used to enhance the selectivity of the entire sensor. The response value of the sensor is proportional to the formaldehyde concentration in the air.
Characteristics and applications of formaldehyde sensors
Features: high sensitivity, high resolution, low power consumption, long service life, high stability, excellent anti-interference ability, excellent linear output.
Applications: Portable instruments, air quality monitoring equipment, air purifiers, fresh air ventilation systems, air conditioners, smart home equipment and other places.
Development of formaldehyde sensors
Formaldehyde mainly exists in gaseous form, so the detection of formaldehyde is mainly to detect formaldehyde gas. The selectivity of existing formaldehyde sensors is not high, so improving the selectivity of formaldehyde sensors will be a direction of future research. Multiple compounding and proper use of the resistance-temperature characteristics of the sensor can improve its selectivity; because formaldehyde is very harmful, Therefore, it is also very important to improve its sensitivity, lower detection limit and recovery-response characteristics; in addition, reducing the size of the formaldehyde sensor and miniaturizing it is also a focus of future research. To improve the comprehensive performance of the formaldehyde gas sensor, on the one hand, we need to find better gas-sensitive materials and improve the manufacturing process; on the other hand, we need to conduct a multi-faceted synthesis and combine various sensors, but this will increase its volume and cost, so it will shrink Volume and cost have become the focus of its research.
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Industrial oxygen sensor development
Industrial oxygen sensors are indispensable equipment in industrial production and are widely used in metallurgy, chemical industry, electric power, aerospace and other fields.
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Methane gas sensor application scenarios
Methane gas sensor is a sensor that can detect and measure methane concentration. It is widely used in gas monitoring, industrial automation, security monitoring and other fields.
Characteristics of Semiconductor and Electrochemical Formaldehyde Sensors
Formaldehyde gas is one of the carcinogens recognized by the World Health Organization. According to statistical results, house decoration is the main culprit of childhood leukemia.
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How to prevent and control sulfur dioxide pollution in the air
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Gas sensor classification and principle
Gas sensors are classified based on detection targets. Any sensor used to detect gas composition and concentration can be called a gas sensor.