Rosemount OCX 8800, Инструкция по эксплуатации, Страница: 131 / 266

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
7-31
Figure 7-8. Analog Input
Function Block Configuration for
a Typical Temperature
Transmitter
Temperature
Measurement
To Another
Function Block
Pressure Transmitter used to Measure Level in an Open Tank
Situation #1
The level of an open tank is to be measured using a pressure tap at the
bottom of the tank. The level measurement will be used to control the level
of liquid in the tank. The maximum level at the tank is 16 ft. The liquid in
the tank has a density that makes the level correspond to a pressure of 7.0
psi at the pressure tap (Figure 7-9).
Figure 7-9. Situation #1 Diagram
Solution to Situation #1
Table 7-22 lists the appropriate configuration settings, and Figure 7-9
illustrates the correct function block configuration.
Table 7-22. Analog Input
Function Diagram for a Pressure
Transmitter used in Level
Measurement (Situation #1)
L_TYPE Indirect
XD_SCALE 0 to 7 psi
OUT_SCALE 0 to 16 ft
Full Tank
16 ft
7.0 psi measured at
the transmitter
OUT_D
AI Function Block
OUT
Parameter Configured Values
3
8
7
4
0
0
8
6
3
8
7
4
0
0
8
5