Recently, our company signed a gas chromatograph order agreement with a certain environmental protection technology Co., Ltd. in Shanghai. The order consists of GC-2010 gas chromatograph+TCD thermal conductivity cell detector+natural gas chromatography column+calorific value chromatography workstation+computer printer, mainly detecting O2, N2, methane, ethane, propane, isobutane, n-butane, isopentane, n-pentane, and carbon dioxide. After the contract was signed, we shipped and installed according to the customer's requirements. Our service personnel came to the customer's site for installation and debugging, and helped with customer training, which was highly appreciated by the customer.