Dry gas flowmeter | Movie problem!? Flame Tank 2 Speed Legend

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1. Differences in several calibration methods for flow measuring instruments

1. Selection of several calibration methods. Flow measuring instruments are usually calibrated using two methods: real flow calibration and dry calibration. The method of calibrating flow meters depends on various factors such as the measurement systems requirements for measurement uncertainty, the type and purpose of the flowmeter being calibrated, the calibration conditions available, and the required calibration costs. Generally, flow meters used for liquid measurement (such as crude oil and water meters) are mostly calibrated using real flow, while flow meters used for gas measurement (such as differential pressure flow meters used for natural gas trade settlement) are mostly calibrated using dry calibration methods, with only a few using boundary flow nozzles for online real flow calibration or offline calibration.

2. Differences in several calibration methods. 1. Differences in calibration conclusions. Dry calibration of flow meters using a combination measurement method is based on the measurement results and uncertainties of various relevant parameters, and the total uncertainty of the flow measurement of the instrument is synthesized according to the error handling method. It indirectly determines the uncertainty range of the flow measurement instrument with a certain degree of confidence and cannot provide specific error values.

. It is usually based on a large amount of rich experimental data and standardized technical requirements, maintaining the characteristics of metrological testing and consistency. For example, there are already mature dry calibration techniques for standard orifice plate throttling d Dry gas flowmeter

evices, critical flow Venturi nozzles, and so on. Taking the orifice flowmeter as an example, its outflow coefficient formula is based on extremely rich and sufficient experimental data, and the error range of the outflow coefficient given by the standard is not greater than 0.6%. When measuring the uncertainty of synthetic orifice flow, only a certain range of uncertainty can be given with a certain degree of confidence. Real flow verification, especially online real flow verification, is most in line with the metrological characteristics of accuracy, consistency, traceability, and testing. It can achieve true calibration or assignment of flow measurement instruments, and ensure continuous and closed transmission and traceability of measurement values. Offline verification provides the error value or flowmeter coefficient of flow meters under verification conditions, but due to differences in actual operating and installation conditions from the verification conditions, the relevant physical parameters of the medium and even the medium itself may vary. In fact, this type of verification is not a true calibration or assignment. Strictly speaking, the offline calibration results of flow meters can only indicate their metrological characteristics under calibration conditions. Most actual environmental conditions, installation conditions, and operating conditions of the instrument are significantly different from the calibration conditions, which can bring additional errors to the flow meter. The size of the additional error is always subjectively judged based on certain experience. Therefore, offline calibration does not require high requirements for flow measurement results, or even if there are additional errors, it can

Dry gas flowmeter | Movie problem!? Flame Tank 2 Speed Legend

1. Differences in several calibration methods for flow measuring instruments

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