TGS2611 performance as biogas monitoring instrument in digester model application

Gas chromatography for biogas concentration measurement is too expensive for people who made biogas independently. An instrument with cheaper TGS2611 sensor can be made to monitor biogas concentration. The instrument requires initialization for 60 seconds. TGS2611 sensor output voltage has proportionally changed to the temperature change. Two gas sensors used in the research have 12.125 mV/°C and 12.875 mV/°C of temperature constant. The instrument needs 10 seconds to respond the increase of biogas concentration and needs 25 seconds to respond the decrease of biogas concentration. The instrument which applied for biogas formation monitoring shows that higher temperature on digester B with average temperature 34.48°C, produces more biogas compared to digester A with average temperature 26.98°C after 34 hours of monitoring. Statistically, the instrument can be said has good precision due to its relatively small deviation, in average, gas sensor A has 1.36% and gas sensor B has 1.23% of relative standard deviation.