Coriolis mass flow meter online calibration device adopting movable standard meter method

Abstract

The invention belongs to the technical field of metering and instrument detection and particularly relates to a movable standard meter method Coriolis mass flowmeter on-line calibration device. The device comprises a prying base bottom frame, a pipe support and a plurality of U-shaped pieces rotationally connected to a lower end of the prying base bottom frame, wherein notches of the U-shaped pieces are arranged downwards, and rolling wheels making contact with the ground are rotationally connected into the notches of the U-shaped pieces; upper ends of the prying base bottom frame and the pipe support are connected with a pipeline, the port of the pipeline is connected with an API male head, a side wall of the pipeline is connected with two flexible connectors, a side wall of the pipeline between the two flexible connectors is fixedly connected with a standard meter, an end, away from the API male head, of the pipeline is connected with a loading arm, and a side wall of the pipeline on the lower side of the loading arm is connected with a draining and spraying mechanism. According to the device, detection accuracy of the mass flow meter is improved; the labor amount for offline detection and disassembly of the flow meter and the potential metering risk caused by disassembly and assembly are avoided; and the use is flexible, and enterprises can carry out necessary detection at any time, and thereby disputes of metering handover are avoided.

Description

technical field [0001] The invention relates to the technical field of metering and instrument detection, in particular to an online calibration device for a movable standard meter Coriolis mass flowmeter. Background technique [0002] Existing mass flowmeters used for transportation and measurement generally require periodic verification. Internationally, ISO10790:1994 "Fluid Flow Measurement in Closed Pipelines - Coriolis Mass Flowmeter" is used to verify mass flowmeters. my country has also formulated corresponding verification procedures JJG1038 -2008 "Coriolis Mass Flowmeter Verification Regulations" is used for off-line verification of mass flowmeters. [0003] The problems and reasons of existing devices include the following points: [0004] Process medium, process medium temperature, process medium pressure, ambient temperature, vibration, etc. will all cause the deviation between the measured value of the instrument and the actual value. Various influencing factor...

AI Technical Summary

Problems solved by technology

[0007] 3. The influence of flow fluctuation: Due to the influence of process conditions, the flow meter may have frequent flow changes in practical applications, and this change is very unfavorable to the operation of the flow meter

[0008] 4. The influence of installation conditions: the mass flowmeter is more sensitive to the mechanical vibration of the installation stress. Improper installation will cause the stress to affect the free vibration of the vibrating tube and affect the frequency output of the flowmeter.

The error caused by the installation of the flowmeter can be almost ignored in the offline verification of the flowmeter, and the error caused by the on-site installation of the qualified flowmeter is unpredictable

Even if the work such as zero adjustment is performed, the flowmeter cannot reproduce the state of the off-line verification, causing the measurement results to deviate from the actual situation;

[0009] 5. Although both offline verification and online verification are the verification methods of flow meters, the scope of application of offline verification is relatively limited. In a sense, it can only determine the accuracy of the flow meter

Off-line verification is suitable for occasions where the accuracy of the flowmeter is not high, because it cannot be consistent with the state of the actual application and introduces uncertain errors

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