What is the allowable error range of gas ultrasonic flowmeter?

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Can an ultrasonic flowmeter measure gas flow rate and what is the principle of an ultrasonic flowmeter?

1. Currently, domestically produced ultrasonic flow meters use 1MHz and cannot propagate gas as a medium, so they cannot measure. 2. Principle of Ultrasonic Flow Meter: In the process of measuring the flow state of a fluid, the propagation speed of ultrasonic waves in the upstream is slightly smaller than that in the downstream. In the case of a constant pipe diameter, the flow velocity is proportional to the time difference. The host of the ultrasonic flow meter calculates the flow velocity (display 1) based on this time difference, and the flow velocity X cross-sectional area=flow rate (display 2).

2. What is the allowable error range of ultrasonic flowmeter? The theoretical error range that gas ultrasonic flow meters can achieve is very small, even below 0.3%. However, due to the fact that the working level accuracy of domestic calibration devices is mostly at the 0.25% level, this limits the accuracy of actual calibration. According to the JJG1030-2007 Ultrasonic Flow Meter Calibration Regulations, the error between the tested meter and the standard meter cannot be less than three times the accuracy of the standard meter. This means that even if the accuracy of the standard meter is 0.25%, only meters with an error within 0.75% can be verified. Therefore, the highest accuracy certificate level that domestic testing institutions can provide is level 1. When designing the dust lift, it is only necessary to ensure that the supplier can provide a Level 1 certificate to meet the requirements. This is not only because the Level 1 certificate can meet the accuracy requirements of most application scenarios, but also considering various uncertain factors and error superposition effects in practical operations. It is worth noting that although a Level 1 certificate indicates high accuracy, in practical applications, multiple factors such as the working environment, fluid characteristics, and installation conditions of the flowmeter need to be comprehensively considered to ensure the reliability of the measurement results. In addition, although the Level 1 certificate represents the highest precision calibration standard in China, there may be more stringent requirements for certain high-end applications, such as macro and precision gas metering, environmental monitoring, etc., which require higher precision flow meters. Therefore, when choosing a gas ultrasonic flowmeter, in addition to paying attention to the certificate level, other relevant technical parameters and performance indicators should be comprehensively considered based on specific application scenarios and requirements to ensure the suitability and accuracy of the final selection.

3. What is the allowable error range of ultrasonic flowmeter?

The theoretical error of gas ultrasonic flowmeter can reach over 0.3%, but due to the limitations of domestic calibration devices, the working level accuracy is mostly 0.25%. According to JJG1030-2007 Ultrasonic flowmeter calibration regulations, the error between the tested meter and the standard meter cannot be less than three times.. That is to say, a standard positive coarse gauge of 0.25 can only verify a gauge of 0.75 level at most. Therefore, currently domestic testing institutions can only issue Level 1 certificates at most. When you are designing, as long as the manufacturer issues a Level

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