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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
3-6
L_TYPE is Indirect Square Root
When an inferred measurement is made based on the sensor
measurement AND the relationship between the inferred measurement
and sensor measurement is square root, set the XD_SCALE to represent
the operating range that the sensor will see in the process. Determine the
inferred measurement values that correspond to the XD_SCALE 0 and
100% points and set these for the OUT_SCALE.:
NOTE
When the engineering units of the XD_SCALE are selected, this causes the
engineering units of the PRIMARY_VALUE_RANGE in the Transducer Block
to change to the same units. THIS IS THE ONLY WAY TO CHANGE THE
ENGINEERING UNITS IN THE SENSOR TRANSDUCER BLOCK,
PRIMARY_VALUE_RANGE parameter.
Configuration Examples
Pressure transmitter Situation #1
A pressure transmitter with a range of 0 – 100 psi.
Solution
Table 3-2 lists the appropriate configuration settings.
Table 3-2. Analog Input function
block configuration for a typical
pressure transmitter.
.
Pressure transmitter used to
measure level in an open tank
Situation #2
The level of an open tank is to be measured using a pressure tap at the
bottom of the tank. The maximum level at the tank is 16 ft. The liquid in the
tank has a density that makes the maximum level correspond to a pressure of
7.0 psi at the pressure tap (see Figure 3-1).
Pressure (Channel 1) Temperature (Channel 2)
Pa °C
kPa °F
bar
mbar
torr
atm
psi
g/cm
2
kg/cm
2
inH
2
O at 68 °F
mmH
2
O at 68 °F
mmH
2
O at 4 °F
inHg at 0 °C
mmHg at 0 °C
Parameter Configured Values
L_TYPE Direct
XD_SCALE Primary_Value_Range
OUT_SCALE Primary_Value_Range
Channel 1 - pressure