Emerson Rosemount 3144P Reference Manual page 89

Reference Manual
00809-0100-4021, Rev EA
March 2007
Indirect
Select indirect when the desired output is a calculated measurement
based on the sensor measurement (e.g. ohm or mV). The relationship
between the sensor measurement and the calculated measurement will be
linear.
XD_SCALE and OUT_SCALE
The XD_SCALE and OUT_SCALE each include four parameters: 0%, 100%,
engineering units, and precision (decimal point). Set these based on the
L_TYPE:
L_TYPE is Direct
When the desired output is the measured variable, set the XD_SCALE to
represent the operating range of the process. Set OUT_SCALE to match
XD_SCALE.
L_TYPE is Indirect
When an inferred measurement is made based on the sensor
measurement, 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
To avoid configuration errors, only select Engineering Units for XD_SCALE
and OUT_SCALE that are supported by the device. The supported units
are:
Temperature (Channel 1 and 2)
C
°
F
°
°K
°R
Ω
mV
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.
Rosemount 3144P
Terminal Temperature
C
°
F
°
K
R
4-15