Filter
Top Products
B-9
Analog Input (AI) Function Block
.
Figure B-3. Analog Input Function
Block Diagram for a Typical
Temperature Transmitter.
Application Example: 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 (see Figure B-4).
Figure B-4. Situation #1 Diagram.
Solution to Situation #1 Table B-4 lists the appropriate configuration settings, and Figure B-5
illustrates the correct function block configuration.
TABLE B-3. Analog Input Function Block Configuration for
a Typical Temperature Transmitter.
Parameter Configured Values
L_TYPE Direct
XD_SCALE Not Used
OUT_SCALE Not Used
Temperature
Measurement
To Another
Function Block
OUT_D
OUT
AI Function Block
FIELDBUS-FBUS_04A
16 ft
7.0 psi measured at
the transmitter
Full Tank
FIELDBUS-3244MV-3244A_01A
TABLE B-4. Analog Input Function Block Configuration for a
Pressure Transmitter used in Level Measurement (situation #1).
Parameter Configured Values
L_TYPE Indirect
XD_SCALE 0 to 7 psi
OUT_SCALE 0 to 16 ft