Emerson Rosemount 3051 CF Series, Reference Manual

Page: 96 / 146

Line pressure 500 psig (34,5 bar)
3. Calculate total probable error (TPE).
TPE = = 0.105% of
span
Where:
Reference Accuracy = ± 0.04% of span
Ambient Temperature Effect =
Span Static Pressure Effect
(1)
=
(1) Zero static pressure effect removed by zero trimming at line pressure.
4. Calculate the stability per month.
5. Calculate calibration frequency.
5.3.3 Compensating for span line pressure effects (range 4
and 5)
Rosemount 2051 Range 4 and 5 Pressure Transmitters require a special calibration
procedure when used in differential pressure applications. The purpose of this procedure is
to optimize transmitter performance by reducing the effect of static line pressure in these
applications.
The systematic span shift caused by the application of static line pressure is –0.95 percent
of reading per 1000 psi (69 bar) for Range 4 transmitters and –1 percent of reading per
1000 psi (69 bar) for Range 5 transmitters. Using the following procedure, you can correct
the span effect to ±0.2 percent of reading per 1000 psi (69 bar) for line pressures from 0 to
3626 psi (0 to 250 bar).
Use the following example to compute correct input values.
Example
A Range 4 differential pressure transmitter (Rosemount 3051CD4...) is used in an
application with a static line pressure of 1200 psi (83 bar). The DP measurement span is
from 500 inH
2
0 (1, 2 bar) to 1500 inH
2
O (3, 7 bar). To correct for systematic error caused
by high static line pressure, first use the following formulas to determine the corrected
values for the high trim value.
Operation and maintenance Reference Manual
July 2020 00809-0100-4774
96 Rosemount 3051