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34-ST-03-64
Page 16
Density or Interface*
Calculate the minimum and
maximum pressure differentials to
be measured.
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
SGf = Specific Gravity of
capillary fill fluid (see
page 11 for values)
LP
HP
24257
Figure 19—Density, direct acting instrument configuration.
* Contact STC-Phoenix concerning
applications for model STR13D.