Figure 2-27. Bubbler liquid level measurement example.
mA dc
Let X equal the vertical distance between the minimum and maximum
measurable levels (100 in.).
Let SG equal the specific gravity of the fluid (1.1).
Let h equal the maximum head pressure to be measured in inches of water.
Let Range equal zero to h.
Then h = (X)(SG)
= 100 x 1.1
= 110 inH
2
O
Range = 0 to 110 inH
2
O
20
inH
2
O
0
4
110
T
AIR
X
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