Level measurement by Dp transmitter

Level measurement using DP transmitter is common to use, even can be called as a first choise for the level transmitter, but much cheaper than type2 as displacer level transmitter, radar wave, etc., in addition to easier installation.

DP Transmitter principle itself is hydostatik pressure from the formula:
P = pgh

To open the tank, for the high P diconnectkan to the bottom of the tank, while for P is low, just enough atm, this is because:
Phigh = pgh + atm, Plow = atm
So to compensate for atm, DP = pgh + atm-atm
Obtained h.

Meanwhile, close to the tank, just like an open tank, but for low P diconnectkan to the top of the tank, this is to compensate for the gas pressure from the tank:
thus becomes DP = pgh + PGAS-PGAS, so get h.

At the measurement level using DP, we must know the property (P or can also SG) is fluid.

Closed tank to have two kinds of installations are:
1. Dry Leg: where to P low, the transmitter direct contact with the fluid, in this case the fluid is a gas
2. Wet Leg: where to P low, the transmitter given the different media such as fluid (glycol / silicone oil / water-common) for compensation from the condensation of the fluid media measured (using diapragm) or because a particular case (such as a corrosive gas fluid)