Emerson Rosemount 1199, Reference Manual, Page: 78 / 104

4.1.4 Non-zero based lower range value (transmitter mounted
above seal)
Figure 4-4: Remote Capillary
ATM = open to atmosphere
d
H
= vertical distance from transmitter to high pressure seal
d
L
= vertical distance from transmitter to low pressure seal
L
max
= the maximum level of process above the high pressure seal and typically the 20
mA lower range value
L
min
= the minimum level of process above the high pressure seal and typically the 4
mA lower range value
SG
F
= specific gravity of fill fluid
SG
P
= specific gravity of process fluid
Tank span = L
max
× SG
P
– L
min
× SG
P
= (108 in.
×
0.75) = 81 inH
2
O
4 mA = L
min
×
SG
P
+(d
H
×
SG
F
)
= (0 in. × 0.75) + (–120 in. × 0.934) = –112.08 inH
2
O
20 mA = L
max
× SG
P
+ (d
H
× SG
F
)
= (108 in.
×
0.75) + (–120 in.
×
0.934) = –31.08 inH
2
O
Span = 81 inH
2
O (–112.08 to –31.08 inH
2
O)
Note
The height of the transmitter (H
d
× S
g
) should not be greater than approximately 394
inH
2
O (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.
Configuration Reference Manual
May 2020 00809-0100-4002
78 Rosemount DP Level