Hazardous Area Oxymitter 5000
D-12
Instruction Manual
IM-106-350C, Rev 2.2
July 2008
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 in H
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 D-6 lists the appropriate configuration settings, and Figure D-7
illustrates the correct function block configuration.
Table D-6. Analog Input
Function Block Configuration for
a Differential Pressure
Measurement
Figure D-7. Function Block
Diagram for a Differential
Pressure Transmitter Used in a
Flow Measurement
Parameter Configured Values
L_TYPE Indirect Square Root
XD_SCALE 0 to 20 in.
OUT_SCALE 0 to 800 gal/min
38740089
AI
Function
Block
PID
Function
Block
AO
Function
Block
OUT_D
OUT
Analog
Measurement
BKCAL_INBKCAL_OUT
IN
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