MG811 CO2 sensor original manufacturer
Listed company in Shenzhen
Fast delivery and service
Competitive price

MG811   CO2 Sensor Features

Good sensitivity and selectivity to CO2

Low humidity and temperature dependency         

Long stability and reproducibility

Application

Air Quality Control

Ferment Process Control

Room Temperature CO2 concentration Detection

Working Principle

Sensor adopt solid electrolyte cell Principle,It is composed by the following solid cells

Air,Au|NASICON|| carbonate|Au, air,CO2

When the sensor exposed to CO2,the following electrodes reaction occurs

Cathodic reaction2Li + + CO2 + 1/2O2 + 2e - = Li2CO3

Anodic reaction2Na+ + 1/2O2 + 2e- = Na2O

Overall chemical reactionLi2CO3 + 2Na + = Na2O + 2Li + + CO2

The Electromotive forceEMF result  from the above electrode reaction, accord with according to Nernsts equation:

        EMF = Ec - (R x T) / (2F) ln (P(CO2)) 

 P (CO2)CO2--- partial Pressure   EcConstant Volume    RGas Constant volume  

 T Absolute Temperature KFFaraday constant

From  Figure 1B, Sensor Heating voltage supplied from other circuit , When its surface temperature is high enough , the sensor equals to a cell, its two sides would output voltage signal ,and its result accord with Nernsts equation. In sensor testing, the impedance of amplifier should be within 1001000GΩ,Its testing current should be control below 1pA.

Specifications