How can density be measured using a DP transmitter
To measure density using a DP transmitter, the tank height is kept constant and the change in pressure is due to a change in density. First let’s understand the concept. This calculation is very similar to the normal level calculation
Density calculation using DP transmitter
Our simple pressure measurement formula is here.
The photo above shows a 100-inch-high container, and this tank contains liquids of a specific gravity of 0.5, so what is the pressure at the bottom? Height x Specific gravity = InH2O …… .. (Reference below) 100 (inches) X 0.5 = 50 inH2O Now let’s keep “Height Same” and change its specific gravity to 0.9 Height x Specific gravity = InH2O 100 (inches) ) X 0.9 = 90 inH2O
“When the transmitter senses a pressure of 50inH2O, we know the SG of the fluid inside is 0.5, and when the transmitter senses a pressure of 90inH2O, we can know the SG of the liquid is 0.9. If this concept is clear, calculate” Is a piece of cake ”!!!
Our calibration range is 50 inH2O to 90 inH2O
Here are the simple steps
(For 4mA Cases (LRV – Lower Range value case
1) Calculate the pressure on the LP (operation) side of the transmitter
2) Calculate the pressure on the HP (operating) side of the transmitter
3) Differential pressure = pressure in (HP HP – LP Side)
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