Classification and application of carbon dioxide sensors

The role of carbon dioxide sensor

The co2 sensor is a machine used to detect the concentration of carbon dioxide. Carbon dioxide is one of the raw materials for photosynthesis of green plants. 95% of the dry weight of the crop comes from photosynthesis. Therefore, the use of carbon dioxide sensors to control the concentration has become an important factor affecting crop yields.

Application aspects of carbon dioxide sensor

Carbon dioxide sensors are widely used in industries, agriculture, medical and health, environmental protection, aerospace and other fields.
Of course, not only carbon dioxide sensors are widely used in gas sensors, but other gas sensors are also widely used. With people's in-depth understanding of gas sensors, gas sensors will be used in more environments. Of course, we must ensure its sensitivity and stability when producing gas sensors.

Classification

Infrared carbon dioxide sensor: This sensor uses the principle of non-dispersive infrared (NDIR) to detect the presence of CO2 in the air. It has good selectivity and no oxygen dependence. It is widely used in various occasions where flammable and explosive gases exist.
Catalytic carbon dioxide sensor: It converts the concentration of carbon dioxide detected on site into a standard 4-20mA current signal output. It is widely used in petroleum, chemical, metallurgy, refining, gas transmission and distribution, biochemical medicine and water treatment industries.

Thermal conductivity carbon dioxide sensor. It is made according to the principle that the total thermal conductivity of the mixed gas changes with the content of the gas to be analyzed. The two arms of the bridge are formed by the pairing of the detection element and the compensation element, and the resistance of the detection element becomes smaller when it encounters flammable gas. When encountering non-flammable gas. the resistance of the detection element becomes larger (air background), and the output voltage of the bridge is variable. The voltage variable increases in direct proportion with the increase of gas concentration. And the compensation element functions as a reference and temperature compensation. The main application places are natural gas, liquefied gas and coal gas at civil and industrial sites. Concentration detection of flammable gases such as alkanes and organic solvent vapors such as gasoline, alcohol, ketone, benzene, etc.