Emerson Rosemount 1199, Reference Manual, Page: 13 / 104

Figure 2-5: Balanced System
+3.6 inH
2
O
(9.0 mbar)
Head temperature
effect
No error
(Cancels out) Seal temperature
effect
+3.6 inH
2
O
(9.0 mbar)
Total temperature
effect on system
Note
Temperature effects were calculated in Instrument Toolkit using a 2-in. (DN 50) FFW seal,
Silicone 200, 10 ft. (3 m) between the taps, over a 50 °F (28 °C) temperature change.
Tuned-Systems assemblies are asymmetrical remote seal systems with one seal directly
mounted to the high side of the differential pressure transmitter, and the other side
connected to a seal via capillary. Another possible Tuned-System assembly is any remote
seal system with unequal lengths of capillary or two different remote seals on the high and
low pressure connections. Due to the unequal lengths of capillary, there are seal
temperature effects. However, this seal temperature effect counters the head pressure
from the oil-filled capillary and reduces total temperature effects on the entire system.
Figure 2-6: Tuned-System Assembly
Head temperature
effect +3.6 inH
2
O
(9.0 mbar)
Seal temperature
effect -1.7 inH
2
O
(4.2 mbar)
Total temperature
effect on system +1.9 inH
2
O
(4.7 mbar)
Note
Temperature effects were calculated in Instrument Toolkit using a 2-in. (DN 50) FFW seal,
Silicone 200, 10 ft. (3 m) between the taps, over a 50 °F (28 °C) temperature change.
Reference Manual Remote Seal Systems
00809-0100-4002 May 2020
Rosemount DP Level 13