Today, there are many formaldehyde sensors on the market, with different types of functions varying. If you don't know much about this, let us work with the editor to understand how the electrochemical formaldehyde sensor works.
There are many types of formaldehyde detection instruments on the market. Most companies use electrochemical methods to detect formaldehyde. So, before we understand the principle of formaldehyde sensors, we should first understand what formaldehyde is and how it is formed. Formaldehyde, chemical formula HCHO or CH2O, molecular weight 30.03, also known as formic aldehyde. Colorless, irritating to human eyes, nose, etc. The main components are hydrocarbons and hydrogen, which are widely used for sterilization, disinfection, preservatives, etc.
The electrochemical formaldehyde detector adopts the principle of highly sensitive electrochemical sensors, combines microcontroller technology and network communication technology, and collects air samples at the test site. Because the formaldehyde concentration is different, the sensor gets different potential signals, and the signals are processed to display the formaldehyde concentration. Through the detection of formaldehyde gas in the air, the concentration of formaldehyde gas in the air was analyzed, and a high-precision test was performed.
Compared with other methods, the electrochemical formaldehyde sensor has the advantages of strong anti-interference ability, single response, high sensitivity, accurate measurement results, low detection limit, and good recovery-response characteristics. Therefore, the detection principle of formaldehyde has been recognized by most people and is the focus of future formaldehyde gas sensor research.
Introduction of electrochemical formaldehyde sensor:
The electrochemical formaldehyde sensor is encapsulated by a membrane electrode and an electrolyte. The gas concentration signal breaks down the electrolyte into positively charged ions, and the signal is transmitted through the electrode. Its advantages are: fast and accurate response (can be used for ppm level), good stability, quantitative detection, but short life (greater than or equal to two years). It is mainly suitable for the detection of formaldehyde gas. Currently, most international gas detection uses this type of sensor.
The formaldehyde sensor uses a four-electrode electrochemical sensor, including a working electrode and an active auxiliary electrode.
The signal from the auxiliary electrode is used for temperature compensation to increase the selectivity of the entire sensor. The response of the sensor is directly proportional to the formaldehyde concentration in the air.
In addition, the formaldehyde sensor can store all exposure points for each use. The memory can be dynamically managed according to operating time to achieve maximum storage capacity. This memory can store up to 90 individual measurement data or 13,500 data.