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Reference Manual
00809-0200-4801, Rev BA
April 2007
3-13
Rosemount 3051S
Solution to situation #3
Table 3-4 lists the appropriate configuration settings.
Table 3-4. Analog Input function
block configuration for a
pressure transmitter used in
level measurement
(Situation #3).
In this example, when the PV is 4 psi, OUT will be calculated as follows:
Differential pressure
transmitter to measure flow
Situation #4
The liquid flow in a line is to be measured using the differential pressure
across an orifice plate in the line. 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.
Solution
Table 3-5 lists the appropriate configuration settings.
Table 3-5. Analog Input
Function Block Configuration for
a Differential Pressure
Transmitter.
Parameter Configured Values
L_TYPE Indirect
XD_SCALE 2 to 9 psi
OUT_SCALE 0 to 16 ft
Channel 1 - pressure
OUT = 4 psi – 2 psi * (16 ft. – 0 ft.) + 0 ft. = 4.57 ft.
9 psi – 2 psi
Parameter Configured Values
L_TYPE Indirect Square Root
XD_SCALE 0 to 20 in.H
2
O
OUT_SCALE 0 to 800 gal/min.
Channel 1 - pressure
Out
PV XDSCALE0–
XDSCALE100
-------------------------------------------------
OUTSCALE100 OUTSCALE0–()OUTSCALE0+=
OUT
8inH
2
O0inH
2
O–
20inH
2
O0inH
2
O–
------------------------------------------------------
=
(800gal/min. - 0gal/min.) + 0gal/min. = 505.96gal/min.