... toluene, xylene, TVOC,NMTHC)2. Natgas, Artificial Gas, Coal-Mine Gas, LPG, Mixed Gas, High Purity Gas (Ar,He,O2,N2,CO2)3. Food Additives ... door automatically when cooling the column box, power data protection.6. GC9310 gas chromatograph with self-test function, when error occus it ... 62graphite gasket diameter 33nut M8x1 diameter 3.24nut M12x1 diameter 6.25nut M8x1 diameter 2.16microsyringe 0.5,1,10μ ...