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ETC
ETC

MG811 Datasheet

CO2 Sensor


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MG811www.DataSheet4U.com
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
Structure and Testing Circuit
Sensor Structure and Testing Circuit as
Figure, It composed by solid electrolyte layer
1 Gold electrodes 2 Platinum Lead 3
Heater 4 Porcelain Tube 5 100m
double-layer steeless net 6 Nickel and copper
plated ring 7 Bakelite (8) Nickel and copper
plated pin 9
CO2 Sensor
Figure 1A
Figure 1B
Working Principle
Sensor adopt solid electrolyte cell Princip le 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 reaction 2Li + + CO2 + 1/2O2 + 2e - = Li2CO3
Anodic reaction 2Na+ + 1/2O2 + 2e- = Na2O
Overall chemical reaction Li2CO3 + 2Na + = Na2O + 2Li + + CO2
The Electromotive force EMF result from the above electrode reaction, accord with according to Nernst’s equation:
EMF = Ec - (R x T) / (2F) ln (P(CO2))
P(CO2) CO2--- partial Pressure Ec Constant Volume R Gas Constant volume
T Absolute Temperature K F Faraday 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
In
sensor testing, the impedance of amplifier should be within 100 1000G Its testing current should be control below
1pA.
Page 1

Specifications
Symbol
VH
RH
IH
PH
Tao
Tas
? E??M F
Parameter Name
Heating Voltage
Heating Resistor
Heating Current
Heating Power
Operating Temperature
Storage Temperature
Output
Sensitivity
Figure 2 Shows gas sensor sensitivity curve.
Conditions:
Tem 28
RH 65%
Oxygen 21%
EMF: sensor EMF under different gas and
concentration .
Technical
6.0±0.1 V
30.0±5%
@200mA
@1200mW
-20 50
-20 70
30 50mV
Remarks
AC or DC
Room Temperature
350 10000ppmCO2
Response and Resume Characteristic
Figure 3 shows Solid electrolyte sensor response
and resume characteristics.
Temperature and Humidity Dependency
Page 2
Part Number MG811
Manufactur ETC
Description CO2 Sensor
Total Page 2 Pages
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