Spherical Tank Measurement - ABB Platinum standard Series Product Instruction

DESCRIPTION AND OPERATION
FUNCTIONAL OPERATION
2 - 8
1 5 0 IN .
1 8 0 IN .
Figure 2-7. Spherical Tank Measurement
corresponding to the distance between the bottom of the
sphere and the cell times the specific gravity (SG) of the
liquid.
2. The full tank pressure is the primary upper range value.
a. If the location of the cell is at the bottom of the sphere,
then the primary upper range value is the height of the
tank times the specific gravity of the liquid.
b. If the location of the cell is below the bottom of the
sphere, as shown in Figure 2-7, then the primary upper
range value is the height of the tank times the specific
gravity of the liquid plus the primary lower range value.
NOTE: From Steps 1 and 2, it can be seen that whether the cell is at
or below the bottom of the sphere, the span between the lower
range value and the upper range value is the same.
3. The secondary lower range value is the empty volume of
the tank (always zero).
C E L L M U S T B E AT
B O T TO M O F S P H E R E ,
O R L O W E R
+ –
T 02 21 1A
WBPEEUI110504A0