Automatic leak detection

A method comprising steps of:

• in a gas chromatography system having at least one closed exhaust path, flowing gas through a column of the gas chromatography system at a first flow rate to cause a first change in pressure from a first pressure, the first change defining a first pressure differential, and measuring the first pressure differential and/or a first time duration for the first change in pressure;
• opening at least one closed exhaust path and setting a respective second flow rate through each of the at least one open exhaust paths;
• flowing the gas through the column at a third flow rate and each of the at least one open exhaust paths at the respective second flow rate, thereby causing a second change in pressure in the gas chromatography system from a second pressure, the second change defining a second pressure differential, and measuring the second pressure differential and/or a second time duration for the second change in pressure;
• determining whether there is a leak in the gas chromatography system based on the measured first pressure differential and/or first time duration and measured second pressure differential and/or second time duration.