Do you know the knowledge of industrial gas flowmeter verification equipment

Do you know the knowledge of industrial gas flowmeter verification equipment? In the past few years, the verification requirements for industrial gas flowmeters have increased greatly. It is mainly reflected in the following three aspects: 1. The verification of high-pressure gas flowmeters with natural gas is not only used for turbine gas flowmeters, but also for orifice plate, Venturi tube and vortex baffle flowmeters. 2. Low gas flow (less than 3.5m3/h) verification of small flowmeters, such as thermal mass flowmeters, mass flow controllers, variable areas and detectors for medical and health equipment. 3. Calibration of gases other than air or natural gas and verification under different operating conditions (different pressures or different gases) Humidity sensor probes, stainless steel electric heating tubes, PT100 sensors, fluid solenoid valves, cast heaters, heating coils. There is no doubt that calibration under operating conditions is the only way to calibrate, however, it is not always possible to calibrate with the ideal fluid. For gas flowmeters, most detection devices are calibrated with air, sometimes with pressure, and in most cases under normal pressure conditions. The high-pressure detection device described in this article is verified by natural gas under pressure, which has great advantages for companies that use flowmeters for natural gas metering stations. For the calibration of gas flowmeters using ethylene as the test fluid, the detection devices of DSM and Shell can be used, and these calibrations will be certified by the Netherlands Metrology Institute. A wide variety of gases can be used for calibration on Dordrecht's low flow detectors. Calibration requirements for gas flow meters measuring steam, nitrogen, carbon dioxide, hydrogen, etc. are constantly increasing. Since there are not many facilities for large-scale calibration with these gases, calibration with another fluid is almost the only option and in many cases a reasonable alternative. If the flow conditions can be estimated, then the flowmeter can be calibrated under conditions different from the operating conditions. The parameter used to estimate the flow conditions is usually the Reynolds number with respect to the inlet diameter of the flowmeter. First, convert the operating condition range into the Reynolds number range. Second, the selected calibration equipment must meet the specified Reynolds number range. Then, calibrate under different pressure conditions or with different gases. Graphs the error or outflow coefficient of a gas flow meter against the Reynolds number. Then check that the flow meter's curve coincides with the overlapping range of Reynolds numbers. If they agree, the error curve for the operating conditions is extrapolated from the calibration curve by interpolation. If the graphs do not match, it is necessary to determine whether the meter under test is faulty or whether the Reynolds number is not an appropriate verification factor for the meter under test. This method is commonly referred to as Reynolds interpolation and may be applicable to flow meters such as turbine meters, orifice plates, and nozzles where a correlation has been established between the Reynolds number of the flow rate and the meter error or outflow coefficient sex. Within a certain range of accuracy grades, the Reynolds characteristics of standard differential pressure flowmeters are unique. Likewise, the characteristics of certain types of turbine gas meters are known. In some cases, it may be necessary to perform several tests to verify that the flowmeter is operating within the Reynolds calibration factor prior to a final calibration. In the future, some work will be required to qualify the performance of vortex flowmeters and to determine the performance of ultrasonic and complementary flowmeters for high-pressure gases. Considering the different pressure ranges and the gas types used, the operating line conditions can be different from the existing calibration conditions. For these cases, the so-called Reynolds interpolation method can be used. This method is applicable to flowmeters with established correlations between flow Reynolds number and meter error or emission coefficient.

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