The flow measurement instrument calibration ways

Abstract: the flow measurement instrument calibration ways difference information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The flow measurement instrument calibration ways the difference between the flow measurement instrument calibration, usually using solid flow calibration and dry calibration in two ways. How the verification flow meter depends on the measurement system for the requirement of the measurement uncertainty, the type of test meter. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the flow measurement instrument calibration ways the difference between the article details. The flow measurement instrument calibration ways the difference between the flow measurement instrument calibration, usually using solid flow calibration and dry calibration in two ways. How the verification flow meter depends on the measurement system for the requirement of the measurement uncertainty, the type of test meter, purpose, have the test condition, offices shall need to cost, and many other factors. , commonly used in the measurement of liquid flow meter ( Such as crude oil and water meters) Basically using solid flow test, and measurement of gas flow meter ( Such as natural gas trade settlement with differential pressure type flow meter) Most adopts dry calibration method, only a handful of real flow verification with the critical flow nozzle online or offline calibration. A, several test methods selection of flow measurement instrument calibration, usually using solid flow calibration and dry calibration in two ways. How the verification flow meter depends on the measurement system for the requirement of the measurement uncertainty, the type of test meter, purpose, have the test condition, offices shall need to cost, and many other factors. , commonly used in the measurement of liquid flow meter ( Such as crude oil and water meters) Basically using solid flow test, and measurement of gas flow meter ( Such as natural gas trade settlement with differential pressure type flow meter) Most adopts dry calibration method, only a handful of real flow verification with the critical flow nozzle online or offline calibration. Second, the differences between 1, several methods of verification test conclusion on different combined measurement method to dry calibration of flow meters, according to the relevant parameters and the uncertainty of measurement results, according to the error processing method to synthesize the instrument of the flow measurement of the total uncertainty, in a certain degree of confidence of indirect to determine the flow meter range of uncertainty, it can't give specific error values. It usually in a large number of experimental data and standardization of the technical requirements of the premise, the characteristics of the experimental measurement and consistency. For example, the standard orifice throttling device, the critical flow venturi nozzle has quite mature dry calibration technologies such as. Orifice meter, for example, the outflow coefficient formula is based on the extremely rich and full of test data, the standard given on the flow coefficient of the error range: not greater than zero. 6%. In the synthesis of orifice plate flow measurement of uncertainty, can only to a certain degree of confidence is given a certain range of uncertainty. Real flow detection, especially on-line real flow verification zui conforms to the accuracy, consistency and traceability and experimental measurement characteristics, can realize the real flow measurement instrument calibration or assignment, can guarantee the continuous and dissemination or traceability. Offline verification flow meter is given under the condition of the calibration error value or meter coefficient, but because of its actual operation condition and installation condition is different from the test conditions, medium relevant physical parameters of the medium itself is also different, even in this examination is not in the true sense of calibration or assignment. Strictly speaking, the flow meter of offline verification results can explain the test under the condition of metrological characteristics, most of the actual use of the site conditions, instrument installation conditions and operating conditions compared with the test condition is different, it will bring additional error to flow meter, and the additional error size is always at a certain experience and subjective judgment, so the offline calibration for the flow measurement results request is not high, or even have additional error can meet the expected measurement requirements, can yet be regarded as a simple and feasible choice. 2, different degree of impact on the physical parameters of modified almost all measurements of flow measurement instrument is affected by the relevant physical parameters measured medium, only influence degree is different. For explicit function expression to its influence on the flow measurement results of physical parameters, as long as know the actual values of these parameters, can to modify it, such as natural gas relative density, the compression factor, entropy index such as the impact on the orifice meter measurement. But for most of the flow measurement instrument, physical parameters affect the performance of the measurement is difficult to accurately expressed in mathematical formula, for example, in liquid measurement, displacement meter and speed meter is sensitive to the change of fluid viscosity, especially under the low viscosity and the lower limit of instrument measuring range, there is no universal viscosity correction formula. In natural gas flow measurement, the gas density change on speed of turbine, and vortex street flowmeter has apparent effect, if consider flowmeter calibration results under low pressure with air medium can directly used in high pressure gas, online real flow calibration become completely eliminate the influence of physical parameters * option, because the dry verification and offline verification can't eliminate the physical parameters of the influence of the flow measurement instrument.

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