The gas rotary piston flow meter (Roots flow meter) is based on the volumetric measurement principle and is used to accurately measure the total volume of gas flowing through a closed pipeline.
The gas rotary piston flowmeter (Roots flow meter) is a positive displacement flow meter. The earliest methods of positive displacement measurement appeared in the 18th century, and by the 1930s, it had been widely applied commercially. The Roots flow meter uses mechanical measuring elements to continuously divide the fluid into individual, known volume portions. The total volumetric flow is measured by counting the number of times the metering chamber is filled and emptied with these volume portions. As a result, it is one of the most accurate types of flow instruments available.
