Emerson 3051S Especificações descarregar pdf (Página 47)

Reference Manual

00809-0200-4801, Rev CA

July 2010

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

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

OUT_SCALE 0 to 800 gal/min.

Channel 1 - pressure

Out

PV XDSCALE0–

XDSCALE100

-------------------------------------------------

OUTSCALE100 OUTSCALE0–OUTSCALE0+=

OUT

8inH

O0inH

O–

20inH

O0inH

O–

------------------------------------------------------

(800gal/min. - 0gal/min.) + 0gal/min. = 505.96gal/min.

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