Analysis and characterisation of biogas feedstocks - The Biogas: Science, Production and Applications - page 70

3.8 Set-up of laboratory reactors including gas measuring device (adapted from Woerl, 2007): 1, magnetic stirrer; 2, bottle/
stirrer fixing; 3, evaporation protection; 4, 2 l glass bottle; 5, tube clamp; 6, effluent sampling tube; 7, feeding tube; 8, water
bath; 9, gas outlet with screw cap and plastic hose connection; 10, heat insulation; 11, foam retention bottle; 12, electronic
data entry unit; 13, 3/2-way valve (a, inlet; b, connection to volume measuring device; c, outlet/sampling of biogas); 14, volume
measuring barrel; 15, measuring electrodes.