The role of carbon dioxide sensor
The carbon dioxide sensors 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
We use carbon dioxide sensors in industrial, agricultural, medical, environmental protection, aerospace and other fields.
Of course, it’s not just carbon dioxide sensors. Other gas sensors are also used in many fields. Of course, we must ensure the sensitivity and stability of gas sensors when producing them.
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. We put it in various places where flammable and explosive gases are present.
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
According to the principle that the total thermal conductivity of the gas mixture changes with the gas content. We use detection and compensation components to form two Bridges of the bridge. When the part encounters flammable gas, the resistance of the detection element decreases.
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.