Points for attention in the use of gas flow meters

Abstract: The information on the attention points of the gas flow meter in use is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. 1. When the working conditions of the instrument change, the zero position of the instrument should be readjusted. At the same time, the conduit of the instrument must be installed horizontally and calibrated with a spirit level. Otherwise, it will increase the influence of working condition changes on zero drift. The rack must not vibrate or shake. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article on the attention points of gas flowmeters in use. 1. When the working conditions of the instrument change, the zero position of the instrument should be readjusted. At the same time, the conduit of the instrument must be installed horizontally and calibrated with a spirit level. Otherwise, it will increase the influence of working condition changes on zero drift. The rack should not be vibrated or swayed, so it is not suitable for use on ships. 2. Although the specific heat of the real gas varies with the pressure, and even some gases vary greatly, the measurement accuracy of the instrument can still be maintained within a certain range. 3. In the selection of conduit materials, in addition to considering corrosion resistance, it is better to choose materials with better thermal conductivity. Taking the measurement of nitrogen as an example, also at 0—100kg/cm2 pressure and 0-7 standard liters/hour flow rate test, the measurement accuracy of nickel tube is 2-2.5% and that of stainless steel is 3-4%. 4. is equivalent to 0—A large amount of test data in the range of 100kg/cm2 pressure and 0-7 standard liters/hour flow rate is correlated and calculated, and the linear regression equation is obtained by the principle of least squares, and its correlation coefficientλThe values ​​are all in the range of 0.999 to 0.9999, which proves that the instrument has good linearity. However, the linearity and the range size have the larger the flow, the more serious the nonlinearity, so the range is generally limited to within 0 ~ 4 standard liters/hour to ensure good linearity. In order to measure large flow and ensure linearity, the shunt principle can be used to expand the range of the instrument. If the bypass tube, venturi tube, orifice plate, etc. are used together, the range can be expanded to tens, hundreds, thousands of standard liters per hour, up to tens of thousands of standard cubic meters. 5. The meter must be turned on to preheat before use. Before it is fully preheated, the meter will be unstable. Better models, the boot warm-up time is less than two hours. 6. During use, when the gas flow changes suddenly, the temperature in the tube must be redistributed through the transfer of heat, so the re-stabilization of the output signal takes a certain amount of time. In order to reduce this hysteresis, the manufacturer often adds a differential network to the electrical circuit of the instrument to make the output signal respond quickly. This is especially necessary when cooperating with other instruments for automatic flow control. 7. Since this type of instrument can only work normally when the specific heat of the gas is relatively stable, any situation such as unstable gas composition, fog in the center of the gas, and working conditions approaching the liquefaction critical area of ​​the gas, etc., because the specific heat value is very unstable, all This instrument should not be used. For example, the critical point of ethylene liquefaction is 50kg/cm2 and 9.9°C. When the pressure exceeds 30kg/cm2 during the test, the meter reading begins to become unstable. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Notes on the use of gas flow meters'

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