Differential pressure liquid level measurement range calculation method

How to calculate the differential pressure liquid level measurement range Calculate according to the density of the measured liquid, the highest and lowest height of the liquid level: the maximum pressure of the positive pressure chamber P+ the maximum pressure of the negative pressure chamber P- The measurement range of the differential pressure level gauge is P- The ~P+ range is ΔP=P+-P-. How to migrate and set the differential pressure level gauge Under normal circumstances, the differential pressure transmitter generally does not need to be migrated. However, in the actual application process, due to the consideration of maintenance, installation and other links to facilitate the operation during use, there will be a level difference between the pressure point and the instrument. Therefore, in order to measure the differential pressure transmitter accurately, migration processing is required. The zero-point migration of differential pressure transmitters is generally divided into three categories, one is positive migration, the other is negative migration, and the other is no migration. The zero-point migration referred to here is that in order to ensure the effectiveness of the basic quantity during measurement, the instrument implements a value change guarantee measure based on the measurement starting point of the differential pressure transmitter, and the changed value is only the upper and lower limit values. It does not change its measurement range. Three types of zero-point migration of differential pressure transmitter If the liquid level of a water storage tank is 0-100mm, the differential pressure is 0 when the liquid level is zero, and the differential pressure is 9.8kpa when the liquid level is 100mm. Therefore, if the installation position and the pressure point are horizontal, there is no migration, and the differential pressure transmitter is set to a range of 0 to 9.8kpa. If the installation position of the differential pressure transmitter and the pressure taking point are not at the same horizontal position, the calculated differential pressure is less than zero for negative migration, and the differential pressure is greater than zero for positive migration. When the calculated differential pressure is less than zero, ΔP=ρgH-Δhρog=9.8-Δhρog<0. When the liquid level is zero, the output signal is lower than 4mA, and when the liquid level is 100mm, the output signal is lower than 20mA. Therefore, the negative migration of the differential pressure transmitter can restore the standard signal output of 4-20mA. At this time, the lower limit of the differential pressure transmitter is not 0 but -Δhρog, and the upper limit of the range is 9.8-Δhρog, that is, the measurement range of the differential pressure transmitter is set to -Δhρog~9.8-Δhρog. When the calculated differential pressure is greater than zero, ΔP=ρgH+Δhρog=9.8+Δhρog>0. When the liquid level height is zero, the output signal is higher than 4mA, and when the liquid level height is 100mm, the output signal is higher than 20mA. Therefore, when the differential pressure transmitter performs positive migration, the standard signal output of 4-20mA can be restored. At this time, the lower range limit of the differential pressure transmitter is not 0 but Δhρog, and the upper range limit is ΔP=9.8+Δhρog, that is, the measurement range of the differential pressure transmitter is set to Δhρog~9.8+Δhρog. When the differential pressure transmitter performs positive and negative migration, only the upper and lower limit values ​​are changed, and its range does not change. It can be seen from the above that if the differential pressure transmitter needs to perform positive migration but does not perform it, the output signal is high, and if the differential pressure transmitter needs to perform negative migration but does not perform it, the output signal is low.
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