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34-ST-03-57
Page 12
Density or Interface
Calculate the minimum and
maximum pressure differentials to
be measured (Figure 18).
P
min
= (SG
min
– SG
f
) x (d);
minimum density, 4mA output
P
max
= (SG
max
– SG
f
) x (d);
maximum density, 20mA output
Where:
d = distance between the taps
SG
max
= maximum Specific
Gravity
SG
min
= minimum Specific Gravity
LP
HP
24257
SG
f
= Specific Gravity of capillary
fill fluid (See Page 9 for
values.)
Figure 18—Density, direct acting transmitter configuration