Process Control Devices makes flowmeters that can be used in compressor lines as well as pneumatic air systems. The thermal mass principle employed by Process Control Devices allows direct air flow measurement without need for pressure or temperature compensation. In-line or insertion types are available, with zero pressure loss, high turndown ratio, and without any moving parts. The ... https://www.pcd-flowmeter.com/flow-meter/compressed-air-flow-meter-india