How does the gas detector sensor work?

　　Generally speaking, electrochemical sensors are used in most gas detection nowadays, such as sulfur dioxide, nitrogen dioxide, carbon monoxide and ozone, which are generally used by electrochemical sensors. The characteristics of electrochemical sensors are simple to use, affordable, accurate and response time is good, but it is more affected by the environment. PM2.5 is generally used by laser, VOCs with PID or FID.

　　The working principle of the electrochemical sensor is simple. It reacts with the measured gas and determines the gas concentration by using the current intensity generated in direct proportion to the concentration within a certain range. PM2.5 uses laser scattering technology to determine the concentration of particles in the air. VOC slightly better end some, PID, FID, FID although high precision, but the cost is also a little high, generally used is PID, PID is photoionization detector, the use of ultraviolet energy to ionize gas molecules, generate current, current amplification and processing, can be determined according to the current intensity of gas concentration.