Precautions for working with mass flowmeters

When using mass flowmeters for operations, combined with our experience and test conditions, there are several aspects that we should pay attention to: When the working conditions of the meter change, the zero position of the meter should be readjusted. At the same time, the conduit of the instrument must be installed horizontally and calibrated with a level. Otherwise, the influence of the change of working conditions on the zero drift will be increased. The frame should not vibrate or sway, so it is not suitable for use on ships. A large number of test data within the flow range are correlated, and the linear regression equation is calculated by the principle of the least square method. The correlation coefficientλThe values ​​are all in the range of 0.999 to 0.9999, which proves that the instrument has good linearity. However, there is a difference between linearity and range, the greater the flow rate, the more serious the nonlinearity, so the range is generally limited to 0-4 standard liters per hour to ensure good linearity. In order to measure a large flow rate while ensuring linearity, the shunt principle can be used to expand the measuring range of the meter. If the bypass tube, Venturi tube, orifice plate are used together, the measuring range can be expanded to tens, hundreds, thousands of standard liters per hour, up to tens of thousands of standard cubic meters. Although the specific heat of the real gas varies with the pressure, and even some gases have relatively large fluctuations, the measurement accuracy of the instrument can still be maintained within a certain range. In the selection of conduit material, in addition to considering corrosion resistance, it is better to choose materials with better thermal conductivity. Since this type of instrument can only work normally when the specific heat of the gas is relatively stable, the gas composition is unstable, there is fog in the center of the gas, and the working condition is close to the critical area of ​​liquefaction of the gas, because the specific heat value is very unstable. This instrument should not be used. If a gas medium is changed, re-calibrate. In the manual, it is often introduced not to recalibrate, but to convert the uncalibrated gas flow according to the specific heat of the two gases. Although it is simple and convenient, it will cause a large error, especially when working under high pressure. We found that the meter The sensitivity of the meter is not necessarily proportional to the specific heat, and it should be re-calibrated.

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