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Reference Manual

00809-0100-4801, Rev FA

October 2010

4-11

Rosemount 3051S Series

The following specifications show the static pressure effect for the 3051S

Range 4 and Range 5 transmitters used in differential pressure applications:

Zero Effect:

± 0.1% of the upper range limit per 1000 psi (69 bar) for line pressures

from 0 to 2000 psi (0 to 138 bar)

For line pressures above 2000 psi (138 bar), the zero effect error is ± 0.2%

of the upper range limit plus an additional ± 0.2% of upper range limit error

for each 1000 psi (69 bar) of line pressure above 2000 psi (138 bar).

Example: Line pressure is 3000 psi (207 bar). Zero effect error calculation:

± {0.2 + 0.2 x [3 kpsi - 2 kpsi]} = ± 0.4% of the upper range limit

Span Effect:

Correctable to ±0.2% of reading per 1000 psi (69 bar) for line pressures

from 0 to 3626 psi (0 to 250 bar)

The systematic span shift caused by the application of static line pressure is

-1.00% of reading per 1000 psi (69 bar) for Range 4 transmitters, and -1.25%

of reading per 1000 psi (69 bar) for Range 5 transmitters.

Use the following example to compute corrected input values.

Example

A transmitter with model number 3051S_CD4 will be used in a differential

pressure application where the static line pressure is 1200 psi (83 bar).

The transmitter output is ranged with 4 mA at 500 inH

O (1,2 bar) and

20 mA at 1500 inH

O (3,7 bar).

To correct for systematic error caused by high static line pressure, first use

the following formulas to determine corrected values for the low trim and

high trim.

LT = LRV + S x (LRV) x P

HT = URV + S x (URV) x P

Where: LT = Corrected Low Trim Value

LRV = Lower Range Value

S = –(Span shift per specification)

P = Static Line Pressure

Where: HT = Corrected High Trim Value

URV = Upper Range Value

S = –(Span shift per specification)

P = Static Line Pressure

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Emerson 3051S Especificaciones Pagina 85