Compensating For Span Line Pressure Effects (Range 4 And 5) - Emerson Rosemount 2051 Reference Manual

Operation and maintenance
February 2024
4. Calculate the stability per month.
5. Calculate calibration frequency.
5.5 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 Rosemount Differential Pressure Transmitters (Ranges 1 through 3) do not require this
procedure because optimization occurs at the sensor.
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.
Related information
Compensate for span line pressure effect (example)
5.5.1 Compensate for span line pressure effect (example)
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.
High trim value
HT = (URV – [S/100 ×P/1000 × LRV])
Where:
HT
URV
S
P
In this example:
URV
S
P
LT
LT
86
Corrected high trim value
Upper range value
Span shift per specification (as percent of reading)
Static line pressure in psi.
1500 inH O (3.7 bar)
2
-0.95%
1200 psi
1500 inH O + (0.95%/100 x 1200 psi/100 psi x 1500 inH
2
1517.1 inH O
2
Reference Manual
00809-0100-4107
O)
2
Rosemount 2051