When it comes to LC/MS gas generators, there are a few different options to choose from. The most common type of gas generator is the nitrogen gas generator. These systems use a variety of methods to generate nitrogen gas, including the use of an air compressor, an oxygen generator, or a nitrogen tank. Another type of gas generator is the helium gas generator. Helium is a much lighter gas than nitrogen, so it is often used in LC/MS systems that require a very high flow rate.