In closed tanks, the DP transmitter must compensate for the pressure of the vessel above the liquid surface. So the LP side of transmitter is connected to the tank. Here in this post we are discussing about calibration of DP transmitter for a closed tank with dry leg & constant level application for density measurement. This calculation tool only used for constant level application.

Density Measurement using DP Transmitter for closed tank with dry leg |

The minimum and maximum process specific gravities can be obtained from process datasheets.

**The formulas for calculating the tranmitter LRV and URV are;**

**HP Side/LRV/4ma = LSmin**

**LP Side/URV/20ma = LSmax**

Where

L = Closed tank maximum measured level

Smax = Maximum process specific gravity

Smin = Minimum process specific gravity

Note: This calculation is only used for closed tank with dry leg and for constant level application.

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