Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-08
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-08: Discussion question: 290. When the density of the liquid medium is greater than that of the flushing water, does the addition of flushing water affect the accuracy of level measurement?
It depends on the type of level gauge you use; different measurement principles yield different results. Pressure-type gauges are definitely inaccurate, while buoyancy-type gauges are not affected
Will the rinse water dissolve in the liquid medium? The type of level gauge used will affect the final judgment. The conditions are insufficient
Generally, no. However, to control the flow rate of the flushing water, it is also necessary to consider whether the density difference has an impact on the measurement.
It depends on the type of level gauge you use; different measurement principles yield different results. Pressure-type gauges are definitely inaccurate, while buoyancy-type gauges are not affected
The influence is negligible; the molecular motion of the medium quickly balances the density.
Generally, no. However, to control the flow rate of the flushing water, it is also necessary to consider whether the density difference has an impact on the measurement.
When the density of the liquid medium is greater than that of the flushing water, the addition of flushing water does not affect the accuracy of level measurement. The density of the liquid medium is greater than that of water; since the amount of flushing water added is small, the density of the solution formed by this flushing water is higher than that of the flushing water itself. The more solute present in the liquid medium, the higher its mass fraction, and thus the denser the solution becomes, approaching the density of the liquid medium.