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In a closed level tank, the process fluid’s specific gravity (Sg) should be the same as the wet leg of the differential pressure (DP) transmitter. This is due to the fact that the hydrostatic pressure produced by the fluid in the wet leg is inversely proportional to the fluid’s density. Measurement errors in the DP transmitter may occur if the Sg of the fluid in the wet leg differs from that of the process fluid.
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Due to numerous factors, such as compatibility concerns with the process fluid or the necessity to maintain a specified temperature range, it may occasionally be required to utilize a separate fluid in the wet leg. In these circumstances, it’s crucial to pick a fluid with a known, stable Sg that is comparable to the process fluid. As a result, measurement errors in the DP transmitter are reduced.
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In a closed level tank, whenever possible, it is advised to utilize the same fluid as the process fluid in the wet leg of a DP transmitter. This makes level measuring more accurate and trustworthy.