Open Vessels level calibration
Differential pressure measurement is easy to install, has a wide range, and provides a fast response time. With the use of external diaphragm seals and flange connections, these instruments can be used to measure fluids such as slurries and hot or corrosive liquids.
This system is based on the same principle as the hydrostatic pressure gauge method, but uses a DP transmitter to provide a signal to a remote indicator or controller.
the hydrostatic pressure exerts its force against the diaphragm on the HP side (high pressure). Any differential pressure detected between the HP and LP side is converted to a signal that is directly proportional to the level in the tank.
Zero Suppression and elevation
If the DP cell is mounted above or below the actual bottom of the vessel or in a closed vessel, then a zero elevation and zero suppression adjustments of the transmitter range will become necessary