What are the factors affecting the verification of gas flowmeter?

1. The influence brought by the standard device The standard device in the verification process of the standard method gas flowmeter is a critical flow nozzle type gas flow device. When there is air flow through the nozzle inlet and outlet, the gas flow rate will not change. When the conditions are met, the state of critical flow can be reached. Depending on the combination of nozzles, the positions of the detected flow points are also different, and each flow point is in a critical flow state. In each group of nozzles, the smallest nozzle marks the minimum flow point that can be detected. We need to make a scientific and reasonable selection of nozzles with different flow rates. If there are zeros and wholes, and the size is uniform, we can find the flow point specified in each verification regulation. Gas flow meters usually have 3 to 7 verification points for the maximum flow rate and 3 to 7 verification points for the minimum flow rate. At the same time, the deviation of the flow point is specified. Compared with the flow specified in the regulations, the actual verification flow rate should not exceed 5% according to the requirements of the 'Velocity Flow Meter' verification regulations. Therefore, for a standard device such as a nozzle, its quantity and specifications are clearly required. For example, if 6 or 7 appears in the mantissa of the flow point, the corresponding flow combination in the nozzle is 1m3/h and 2m3/h. Purchasing personnel in the procurement department must fully and comprehensively consider the flowmeter procurement process to meet the use requirements. Among them, they must attach great importance to the combination form of the nozzle and the minimum flow rate of the nozzle, so it directly determines the basic detection function of the device itself. The key content in the test, especially the legally authorized measurement standards for social public undertaking arbitration verification, should attract the attention of relevant personnel, which is more obvious in the comparison of gas flow devices. Due to the different combinations of flow points, the test results are not comparable. Once there is a problem with the use of the standard device, there will be misjudgment. If the flow point is not set according to the above requirements, there will be phenomena that do not meet the regulations. Once a serious gas measurement accident occurs, it will cause huge economic losses to the enterprise. Therefore, the measurement process must be strictly in accordance with the corresponding regulations. Specification requirements are enforced. Scientifically and reasonably select the nozzles according to the actual model of the weight, minimize the number of nozzles, and use a variety of combinations to ensure the safety and stability of the gas measuring device during use. 2. The impact caused by the measurement time. When measuring natural gas each time, the measurement time must be in accordance with the requirements of the 'National Metrology Verification Regulations', and cannot exceed the measurement standard time range. According to regulations, the number of pulses of a class A gas flowmeter cannot be greater than 1/3 of the repeatability of the gas flowmeter to be tested during the measurement process. We also pay great attention to the flowmeters produced by different manufacturers. There may be certain differences. The flowmeters produced by different manufacturers have different settings for the shortest time measurement. Therefore, we need to read the product manual carefully. Based on the above situation, we carried out a tripartite experiment. Through the experiment, we found that the data results of one party were within the standard range, while the experimental results of the other two parties had large deviations. Through long-term testing and careful analysis of the results, we can also find certain similarities between the data. At the same time, we extend the testing time appropriately, and the results shown by the above sets of data are similar. In the later stage of the experiment, we know that the temperature, humidity, pressure, etc. in the atmosphere will have an impact on the gas flow detection process, which may eventually cause large errors in the detection results. The measurement time also needs to be properly controlled to avoid the impact of changes in temperature, humidity, pressure, etc. on its motion stability, resulting in errors in gas measurement results. Choose an appropriate measurement time according to the actual situation to avoid the above factors affecting the measurement results and ensure the accuracy of the measurement results. At the same time, we can also control the flow rate of the flowmeter at 70% to 90% before measurement, and measure after 6 minutes of operation The result is more precise.

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