Emerson Process Management 2051 manual Configuration Examples, Rosemount, Reference Manual

Rosemount 2051

Reference Manual

00809-0200-4101, Rev AA July 2008

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.:

Pressure (Channel 1)	Temperature (Channel 2)
Pa	°C
kPa	°F
bar
mbar
torr
atm
psi
g/cm2
kg/cm2
inH2O at 68 °F
mmH2O at 68 °F
mmH2O at 4 °F
inHg at 0 °C
mmHg at 0 °C

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

Table 3-2. Analog Input function block configuration for a typical pressure transmitter.

Pressure transmitter used to measure level in an open tank

Situation #1

A pressure transmitter with a range of 0 – 100 psi.

Solution

Table 3-2 lists the appropriate configuration settings.

.

Parameter	Configured Values
L_TYPE	Direct
XD_SCALE	Primary_Value_Range
OUT_SCALE	Primary_Value_Range
Channel	1 - pressure

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).

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