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Reference Manual
00809-0100-4002, Rev BB
November 2012
Rosemount 1199
4-4
Figure 4-3. Remote Capillary
L
min
= the minimum level of process and typically the 4mA set point.
L
max
= the maximum level of process and typically the 20mA set point.
SG
= Specific gravity of the process
Sg
= Specific gravity of the remote fill fluid
Hd
= Capillary vertical distance going to high side sensor
Tank span
= (L
max
x SG)
Example A
Tank Span:
108in X 0.75 = 81inH
2
O
4mA
= L
min
x SG + (Hd x Sg)
= (0 x 0.75) + (120 in. x 0.934)
= -112.08 inH
2
O
NOTE
Pressure pulling down on the high sensor side will register as a negative
pressure value.
20mA
= L
max
x SG + (Ld X 0.934)
= (108 in. x 0.75) + (-112.08)
= -31.08 inH
2
O
SPAN = 81 inH
2
O (-112.08 to -31.08 inH
2
O)
NOTE
The height of the transmitter (Hd X Sg) should not be greater than approx.
394in (14.2 PSI) not to exceed the 0.5 PSIA sensor limits of a Coplanar DP or
GP.
NOTE
Silicone 200 has a specific gravity of 0.934.
Содержание 1199
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