Features of Flow Measuring Instruments for Process Control

The characteristics of flow measuring instruments for process control Process control is the field that uses the most flow meters (excluding household water meters and gas meters). The role of flow meters in process control is to monitor the fluid flow in closed pipelines. Some parts will also The flow measuring instrument forms a regulating system together with regulating instruments, actuators, etc., to stabilize the flow at a suitable value, thereby realizing the stabilization of the process. For such a specific task, flow measurement instruments have the following requirements. (Door reliability requirements ① The instrument should have a high degree of reliability. Modern industrial devices tend to be large-scale continuous processes, instrument failures can easily lead to process instability, and once the flowmeter installed on the pipeline fails, it is impossible The process is specifically stopped for repairs, so instrument manufacturing and system design must first consider reliability, including the reliability of the thermal resistance used for temperature compensation. Some instrument manufacturers implement Dualization, such as the 8800 (type 3 vortex flowmeter with dual sensors), under the control of the control, can automatically distinguish the signals of the two sensors, once one of them fails, it will be discarded, thereby improving the performance of the transmitter. Reliability. There are also some manufacturers who have designed the method of replacing the sensor under the condition of continuous flow. Some electromagnetic flowmeter manufacturers provide methods and tools for changing the electrode without continuous flow, which have created good conditions for improving reliability.

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