Gas Chromatographs serve as a basis for measurement of individual Natural Gas Components to determine the BTU or Energy Value of the Natural Gas. The use of “On-Line” Gas Chromatographs enables the end user to know 100% of the time the energy value of the gas flowing through their system. It is much like using a “cash register” to keep count of the dollars flowing through your pipelines. Here is an example of just how Gas Chromatographs interconnect with the entire setup to determine the value of the natural gas in question: