The differential pressure value corresponding to the common flow rate

Uncertainty introduced by differential pressure measurement error The uncertainty introduced by differential pressure measurement error is 0.58^^/4? , in the above example, since the upper limit of the differential pressure is reduced, the differential pressure value corresponding to the common flow rate is correspondingly reduced, and the relative error of the intelligent differential pressure transmitter used remains unchanged, so the uncertainty from the relational expression Also unchanged. In fact, the situation on site is very complicated. The differential pressure measurement error in the expression is not only the error caused by the accuracy level of the differential pressure transmitter, but also the measurement error caused by other factors. Especially when it is used to measure the steam flow, the inconsistency of the height of the two condensers, the difference in the temperature of the medium in the pressure pipeline, etc., will cause the transmission of the differential pressure signal to be distorted, which will lead to the increase of 8 厶》, so use the method to reduce the upper limit of the differential pressure 厶/ The method of changing the range is limited. For steam flowmeters, the upper limit of differential pressure should generally not be lower than 201^3. For dry gases, the upper differential pressure limit can be much lower due to the absence of severe signal transmission distortion. Regarding the problem of expanding the range, the method of expanding the upper limit of the differential pressure is used to change the range. In most cases, the uncertainty will not become a problem, and the limiting factor is the pressure loss. When the commonly used flow rate increases, the footprint increases accordingly, and 0 extends on a flat line segment, which is beneficial to the reduction of uncertainty. When the common flow rate increases, the common differential pressure increases correspondingly, the uncertainty increases to a certain extent, and it is beneficial to reduce the percentage error of differential pressure measurement. The biggest adverse consequence is the increase of pressure loss. It can be seen from the relational formula that if the flow rate is doubled, the pressure loss will increase to about 4 times. This issue should be well communicated with the technical profession. It is often encountered in the application of differential pressure flowmeters to change the flowmeter range by changing the upper limit of the differential pressure. If the multiple of the range change is not large, can the upper limit of the differential pressure be recalculated according to the standard?

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