Composite static start-stop method mass flowmeter calibration system

Abstract

The invention relates to a composite static start-stop method mass flowmeter calibration system which is used for checking the flow rate of a mass flowmeter, is a calibrating apparatus adopting the mass flowmeter that is nationally and legally prescribed and can check the main characteristics and accuracy index of the mass flowmeter. The calibration system comprises a water tank, a current stabilizer, a regulating valve, stop valves and an electronic scale, and is characterized in that a flow rate pump set is connected between the water tank and the current stabilizer, the two sides of the flowmeter to be measured are respectively connected with standard flowmeter sets, the two ends of the regulating valve are respectively provided with the stop valves, one end thereof is connected with the water tank, and the other end is connected with the current stabilizer which is connected with a weighing container; the standard flowmeter sets, the flowmeter to be measured, the regulating valve and the electronic scale are connected with a computer. The calibration system has the advantages of weighing method and standard scale method, so as to have high accuracy in calibration and working efficiency and the like; furthermore, a static start-stop method is adopted to calibrate the mass flowmeter, so that the accuracy error caused by inconsonant positive and negative strokes of a steering gear can be avoided.

Description

Technical field [0001] The invention relates to a composite static start-stop method mass flowmeter calibration system. technical background [0002] In order to ensure the accurate measurement of mass flow meters, the measurement performance of the mass flowmeter must be regularly tested or verified before leaving the factory, during use, and after maintenance. The flow calibration of the mass flowmeter is to use the national statutory mass flowmeter verification device to check its main characteristics and accuracy indicators. [0003] The existing mass flow meter calibration devices have weighing method and standard meter method. [0004] For mass flow meters, the most suitable calibration method is the weighing method. The flow chart of weighing method verification is as follows figure 1 As shown, it has the following problems: [0005] 1. When using the weighing method, because the working mode of the dynamic start-stop method is inconsistent with the actual field work mode...

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Problems solved by technology

[0005] 1. When using the weighing method, because the working method of the dynamic start-stop method is inconsistent with the actual on-site working method, when the mass flowmeter calibrated by the manufacturer is applied to the actual site, due to the change of the working environment and method There are deviations in the working characteristics of the mass flowmeter, and the accuracy is reduced

[0006] 2. When using the weighing method, there must be an error in the positive and negative travel time of the commutator, which affects the accuracy error of the entire calibration system, and it is impossible to avoid this error by replacing or improving the commutator

[0007] 3. When using the weighing method, since the fluid in the pipeline cannot be completely injected into the weighing container, part of the fluid will remain in the pipeline, which will cause errors in the accuracy of the calibration system

[0008] 4. When using the weighing method, in order to improve the accuracy of the calibration, it is necessary to reduce the error by weighing a larger flow rate, resulting in a longer calibration work cycle and low calibration efficiency, which is not conducive to the mass production of the manufacturer

[0012] 3. When using the standard table method, once the standard table is seriously deviated or broken, the reliability of the entire calibration system will be reduced, so that the system will be paralyzed and calibration work will no longer be possible.

[0013] 4. When using the standard table method, in order to ensure the accuracy and reliability of the system, it is necessary to regularly check the standard table, thus increasing the workload

[0014] 5. When using the standard meter method, the range of the tested mass flowmeter often does not match the range of the standard mass flowmeter, which causes unnecessary accuracy errors

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