Gases are compressible and changes volume when placed under pressure, when heated or are cooled. Gas meters can be used with LPG in vapour phase,and also Natural Gas. They measure volume of gas(Vm) in m3/hr. Low and medium pressure diaphragm gas meters may be used up to 1.5bar depending on the model. Various types of flow meters include diaphragm GM, Diaphragm type pre paid meter ,AMR gas meters, Rotary displacement type FMs, Turbine type FMs, Ultrasonic FMs. ( Raychem ). It is important to select proper regulating system prior to FMs which require real experience in designing such system.
