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| MG811 Features Good sensitivity and selectivity to CO2 Low humidity and temperature dependency Long stability and reproducibility CO2 Sensor 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 (c) Gold electrodes (c) Platinum Lead (c) 1 2 3 Heater Porcelain Tube 100m 4 (c) 5 (c) double-layer steeless net (c) Nickel and copper 6 plated ring 7 (c) Bakelite (8)ickel and copper N plated pin (c) 9 Figure 1A Figure 1B Working Principle Sensor adopt solid electrolyte cell Princip le is composed by the following solid cells It Air Au|NASICON|| carbonate|Au, air CO2 When the sensor exposed to CO2 following electrodes reaction occurs the Cathodic reaction + + CO2 + 1/2O2 + 2e - = Li2CO3 2Li Anodic reaction 2Na+ + 1/2O2 + 2e- = Na2O Overall chemical reaction Li2CO3 + 2Na + = Na2O + 2Li + + CO2 The Electromotive force EMF(c) result from the above electrode reaction, accord with according to Nernst' equation: s EMF = Ec - (R x T) / (2F) ln (P(CO2 )) P(CO2 ) CO2--- partial Pressure Ec Constant Volume R Constant volume Gas T Absolute Temperature F K(c) 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 Nernst sequation In sensor testing, the impedance of amplifier should be within 100 1000G| Its testing current should be control below 1pA. 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 Technical 6.0 V 0.1 30.0 5%| @200mA @1200mW -20 50 -20 70 30 50mV Remarks AC or DC Room Temperature 350 10000ppmCO2 Sensitivity Figure 2 Shows gas sensor sensitivity curve. Conditions: Tem 28ae RH 65% Oxygen 21% EMF: sensor EMF under different gas and concentration . Response and Resume Characteristic Figure 3 shows Solid electrolyte sensor response and resume characteristics. Temperature and Humidity Dependency |
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