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Online Verification Method for Mass Flowmeter - Focus on Microfluidic Control Technology

Mass flow meter online verification method
The mass flow meter is a kind of thermal measurement, and the flow rate is measured by how many molecular masses are taken away by separate molecules. Because it is measured by a thermal type, it does not affect the measurement result due to changes in gas temperature and pressure. Mass flow meter is a more accurate, fast, reliable, efficient, stable and flexible flow measurement instrument, which will be more widely used in petroleum processing, chemical engineering and other fields. It is believed that it will show great potential in promoting flow measurement. Mass flow meter can not control the flow, it can only detect the mass flow of liquid or gas, through analog voltage, current or serial communication output flow value. However, the mass flow controller is a meter that can detect and control at the same time. In addition to the measurement section, the mass flow controller itself also has a solenoid or piezoelectric valve, so that the mass flow meter control itself constitutes a closed-loop system for controlling the mass flow of the fluid. Mass flow meter controller settings can be provided by analog voltage, analog current, or computer, PLC.
Mass flow meter online verification method
1, understand the piston volume tube
2. Verification method of piston volumetric pipe online density meter
3. Verification method for piston volume tube plus turbine flowmeter and online density meter
Each verification of the mass flow meter allows the verification process to be long enough to eliminate the effects of various uncertainties, thereby improving the accuracy of the mass flow meter verification. This method has the following outstanding advantages compared to other mass flow meter online verification systems:
(1) When the mass flow meter is inspected, the flow operation standard part has an excellent stability and will not affect the operation of the mass flow meter, and the mass flow meter verification work under the actual working conditions can be performed. Calibrate the essential characteristics of the mass flow meter under this application condition;
(2) The time for each verification of the mass flowmeter can be arbitrarily long, which can eliminate the influence of most accidental factors and provide verification accuracy;
(3) The dynamic characteristics of the flow working standard are good. Even if the flow rate has a certain fluctuation during the verification of the mass flow meter, the standard flow meter can accurately reflect it. Because of the fluctuation of the flow rate, it is unavoidable to check online. Compared with other verification methods, this solution has the advantage of being more suitable for online verification.
(4) As long as the repeatability of the standard flowmeter is good, it can ensure its high accuracy to meet the needs of the quality flowmeter verification.

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