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Reference Manual
00809-0100-4002, Rev BB
November 2012
4-3
Rosemount 1199
Non-zero based lower
range value
Figure 4-2. Remote capillary
L
min
= the minimum level of process and typically the 4 mA lower range value
L
max
= the maximum level of process and typically the 20 mA upper range
value
Hd
= Capillary vertical distance from process to high side sensor
SG
= Specific gravity of the process
Sg
= Specific gravity of the remote fill fluid
ATM
= Atmospheric pressure (vented tank)
Tank span =
(L
max
x SG)
Tank Span:
108in x 0.75 = 81inH
2
O
Lmin
4 mA
= L
min
x SG + (Hd x Sg)
= (0 x 0.75) + (60in x 0.934)
= 56.04 inH
2
O
Lmax
20 mA
= L
max
x SG + (Hd x Sg)
=(108in x 0.75) + (56.04)
= 137.04 inH
2
O
SPAN
= 81inH
2
O (137.04 - 56.04)
NOTE
Silicone 200 has a specific gravity of 0.934.
Содержание 1199
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