Emerson 3051S Spezifikationen PDF herunterladen (Seite 46)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

3-12

Solution to Situation #2

Table 3-3 lists the appropriate configuration settings.

Table 3-3. Analog Input function

block configuration for a

pressure transmitter used in

level measurement

(situation #1).

Output calculation for Situation #2

When the L_Type is configured as Indirect, the OUT parameter

is calculated as:

In this example, when PV is 5 psi, then the OUT parameter will be

calculated as follows:

Situation #3

The transmitter in situation #3 is installed below the tank in a position where

the liquid column in the impulse line, with an empty tank, is equivalent to 2.0

psi (see Figure 3-2).

Figure 3-2. Situation #3

Diagram.

Parameter Configured Values

L_TYPE Indirect

XD_SCALE 0 to 7 psi

OUT_SCALE 0 to 16 ft

Channel 1 - pressure

OUT = PV – XD_SCALE_0% * (OUT_SCALE_100% – OUT_SCALE_0%) + OUT_SCALE_0%

XD_SCALE_100% – XD_SCALE_0%

OUT = 5 psi – 0 psi * (16 ft. – 0 ft.) + 0 ft. = 11.43 ft.

7 psi – 0 psi

16 ft

0 ft

2.0 psi measured at

the transmitter

Empty Tank

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Emerson 3051S Spezifikationen Seite 46