The electrical properties characterization of MG-811 gas sensor toward the temperature alteration of soil testing chamber

Abstract

The concentration of CO2 in soil and air is strongly influenced by temperature. When the temperature increase, the thermal energy will increase too and make the particle motion faster. In detecting CO2 gases, the MG-811 gas sensor has a high sensitivity in detecting CO2 gases in the air. The purpose of the research is characterized the electrical properties of MG-811 gas sensor toward temperature alteration. The used method is the experimental method, where the chamber is made of iron filled with CO2 derived from the CO2 gas tube. In the chamber has been paired digital thermometer and MG-811 gas sensor. The temperature alteration in the CO2 gas is regulated by the heater element attached to the chamber. The output of the MG-811 gas sensor will be processed by microcontroller, so it measures the CO2 concentration in units of parts per millions (ppm). The higher the measured temperature on the gas causes faster particle motion, the measured CO2 gas concentration is high and the resulting output voltage is low. But it happens if the temperature changes high, because the gas sensor response is slower than the temperature sensor used.