Owner's manual

A-3
Applications
Situation #2 The transmitter in situation #1 is installed below the tank in a position
where the liquid column in the impulse line, when the tank is empty, is
equivalent to 2.0 psi (see Figure A-4).
Figure A-4. Situation #2 Diagram
Solution Section : Analog Input Function Block Configuration for a Pressure
Transmitter used in Level Measurement (Situation #2) lists the
appropriate configuration settings.
Application Example:
Differential Pressure Transmitter
to Measure Flow
Situation The liquid flow in a line is to be measured using the differential
pressure across an orifice plate in the line, and the flow measurement
will be used in a flow control loop. Based on the orifice specification
sheet, the differential pressure transmitter was calibrated for 0 to 20
inH
2
0 for a flow of 0 to 800 gal/min, and the transducer was not
configured to take the square root of the differential pressure.
Solution Table A-4 lists the appropriate configuration settings, and Figure A-5
illustrates the correct function block configuration.
16 ft
0ft
2.0 psi measured at
the transmitter
Empty Tank
FIELDBUS-3244MV-3244A_02A
TABLE A-3. Analog Input Function Block Configuration for a
Pressure Transmitter used in Level Measurement (Situation #2)
Parameter Configured Values
L_TYPE Indirect
XD_SCALE 2 to 9 psi
OUT_SCALE 0 to 16 ft
TABLE A-4. Analog Input Function Block Configuration for
a Differential Pressure Transmitter
Parameter Configured Values
L_TYPE Indirect Square Root
XD_SCALE 0 to 20 in.
OUT_SCALE 0 to 800 gal/min.