There are two kinds of flow measurement, namely instantaneous flow and cumulative flow.
For example, the crude oil of the pipeline of the sub-transmission station belongs to the custody transfer or the process of continuous control of the petrochemical pipeline or the process control of the production process, etc. Observation.
Instantaneous flow measurement is required to control flow at some workplaces. Therefore, it is necessary to make a selection according to the needs of on-site measurement.
Some flowmeters, such as volumetric flowmeters, turbine flowmeters, etc., measure the principle directly by mechanical count or pulse frequency output, which has a high accuracy and is suitable for the total amount of measurement, such as with a corresponding signaling device. It can also output traffic.
Electromagnetic flowmeters, ultrasonic flowmeters, etc. are used to measure the flow rate of the fluid to derive the flow rate. The response is fast and suitable for process control. The total amount can also be obtained if the integrated calculation function is used.