Rosemount 1199, Справочное руководство

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Reference Manual
00809-0100-4002, Rev BB
November 2012
Rosemount 1199
2-4
Table 2-1. Response Time vs.
Total Performance Example
NOTE:
Calculations done in Toolkit with Silicone 200 fill fluid with 3051 Transmitter
and FFW seal.
NOTE
0.075 capillary inner diameter with long lengths of capillary, over 25ft. (7.6m)
can result in the diaphragm bottoming out in applications with cold ambient
and cold process temperatures. For these applications, 0.075 in. should be
avoided in cold conditions (cold ambient and cold process, as the seal system
will bottom out) or deform at hot conditions. A smaller ID size, either 0.040 in.
or 0.028 in. should be selected.
BALANCED VS.
TUNED-SYSTEM
™
ASSEMBLIES
A balanced system is a symmetrical system that has the same seal and equal
amount of capillary on the high and low pressure sides. Since the capillary
lengths are the same, each side ideally has the same amount of fill fluid,
minimizing or completely eliminating the seal temperature effect due to equal
pressure on both sides of the transmitter diaphragm. The balanced systems
are still affected by the head pressure as shown in Figure 2-4.
NOTE
Smaller diaphragms will cause a larger ± tolerance due to stiffness
characteristics.
Application #1 Application #2 Application #3
Process Temperatures
-49 °F (-45 °C) to
401 °F (205 °C)
-49 °F (-45 °C) to
401 °F (205 °C)
-49 °F (-45 °C) to
401 °F (205 °C)
Ambient Temperatures
32 °F (0 °C) to
104 °F (40 °C) 32 °F (0 °C) to
104 °F (40 °C) 32 °F (0 °C) to
104 °F (40 °C)
Assembly Type
Balanced System Tuned-System Tuned-System
Capillary Length
15 meter 15 meter 15 meter
Capillary ID
0.075-in. (1.905 mm) 0.075-in. (1.905 mm) 0.04-in. (1.092 mm)
Response Time
Ambient Temp. at 0, 20,
and 40 °C
1.9, 1.3, 1.1 sec 1.6, 1.2, 1.0 sec 4.1, 2.6, 2.1 sec
Total Performance
Ambient Temp. at 0
and 40 °C
±3.15%, ±1.89% ±0.90%, ±0.27% ±2.45%, ±1.31%