The Hiden HPR-70 compact bench-top batch inlet gas analysis system is suitable for the analysis of discrete gas samples. A small quantity of gas, usually at or close to atmospheric pressure, is sampled using an automated batch inlet. After expansion and consequent pressure drop the gas is analyzed using a high sensitivity 500 amu quadrupole mass spectrometer. Most minor components in the gas mixture can be measured at levels of 5 ppm or above.