Standard device in gas flow meter validation process

Standard device in the gas flowmeter verification process The gas flowmeter verification results are affected by many factors, mainly including personnel, equipment, environmental conditions, detection methods, etc. The gas flowmeter verification results are analyzed to ensure that the test results are more accurate. The gas flowmeter is affected by many external factors during the use of the meter, mainly including the effective control of the environment, equipment, methods, etc. by the testing personnel, so as to avoid affecting the verification results. 1. Gas flow meter for application range. Gas flowmeters are widely used in various fields. In the industrial field, they are suitable for the measurement of hydrogen, nitrogen, methane and other gases; in the energy field, they are suitable for the measurement of petroleum gas, natural gas, coal bed methane and other gases; In environmental protection projects, poisonous and harmful gases, carbon dioxide gas, etc. are often used for detection. As the application range of gas flowmeters becomes wider and wider, some enterprises have established special flowmeter testing departments one after another. During the verification process of gas flowmeters, they often use Toxic and harmful gas. Carbon dioxide gas detection. 2. Affect standard devices. The standard device in the verification process of the standard method gas flowmeter is a critical flow nozzle type gas flow device. When the gas flow passes through the inlet and outlet of the nozzle, the velocity of the gas flow will not change. As long as the pressure difference meets the conditions, the critical flow state can be reached. For different nozzle combinations, the detected flow point positions are also different, and each flow point is in a critical flow state. Within each set of nozzles, a very small nozzle marks a very small flow point and can be tested. We need to make a scientific and reasonable selection of nozzles with different flow rates. We can find the specified flow points in each verification rule, they have zero and integral, and are uniform in size. Gas flow meters usually have 3 to 7 verification points for very large flow rates and 3 to 7 verification points for very small flow rates. At the same time, the deviation of flow rate is specified. Compared with the flow rate stipulated in the regulations, the deviation of the actual verification flow rate shall not exceed 5% according to the requirements of the speed flowmeter verification regulations. Therefore, there are clear requirements for the number and specifications of standard devices such as nozzles. For example, the combination of 6 or 7 flows in the whole mantissa should be 1m3/h.2m3/h. The purchasing personnel of the purchasing department must fully consider the purchasing process of the flowmeter to meet the requirements of use. Among them, the combination form of the nozzle and the very small flow rate of the nozzle must be highly valued, so it directly determines the basic detection function of the device itself. The key content of the system, especially the legally authorized measurement standards that the public undertakes arbitration verification, should attract the attention of relevant personnel, and the comparative performance of gas flow equipment is more obvious. Due to the different composition of the flow point, the test results are not very comparable. Once there is a problem with the application of the standard equipment, a wrong judgment will occur. If the flow point is not set in accordance with the above regulations, there will be non-compliance with the regulations. Once a serious gas measurement accident occurs, it will cause huge economic losses to the company. Therefore, the measurement process must be strictly followed. Relative specification requirements are carried out. Scientifically and rationally select the nozzles according to the actual weight and model, minimize the number of nozzles, and use a variety of composition methods to ensure the safety and stability of the gas measuring device during use. 3. Affect the measurement time. For each measurement of natural gas, the measurement time must be in accordance with the requirements of the 'National Metrology Verification Regulations', and cannot exceed the time range of the measurement standard. According to regulations, the number of pulses of a class A gas flowmeter during the measurement process cannot be greater than 1/3 of the repeatability of the gas flowmeter to be tested.

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