High Static Line Pressure Span Effect On Rage Codes 1, 2 And 3 Dp Transmitters; High Static Line Pressure Span Correction For Range; Code 4 And 5 Dp Transmitters - Emerson Rosemount 2151N Reference Manual

Reference Manual
00809-0000-4851 Rev AD
December 2023
Correction for High Static
Line Pressure (1)
High Static Line Pressure Span
Effect on Range Codes 1, 2, and 3
DP Transmitters
High Static Line Pressure Span
Correction for Range Code 4 and 5
DP Transmitters
Table 3-1 – Range 4 and 5 Correction
Factors
(1) For Rosemount 2151N pressure transmitters with Standard Option Code "P4", correction for High Static Line Pressure
(HSLP) at customer specified line pressure (with no residual HSLP uncertainty) may have been performed at the factory.
Please contact Rosemount Nuclear for details.
Calibration
Rosemount 2151N Range 1, 2, and 3 differential pressure
transmitters do not require correction for high static pressure
span effect. The correction for these ranges occurs within the
sensor; however, an associated residual uncertainty remains.
This uncertainty is stated as the high static line pressure span
effect found in Product Data Sheet 00813-0000-4851.
Rosemount 2151N Range 4 and 5 pressure transmitters
experience a systematic span shift when operated at high
static line pressure. It is linear and correctable during
calibration.
The correction factor for span shift caused by the application
of static line pressure is shown in Table 3-1.
Range 4 and 5 Span Correction Factor
% Input Reading per 1000 psi (6,90 MPa)
Range 4
Range 5
Correction factors have an uncertainty of ±0.4% of input reading per 1000 psi
(6,90 MPa).
The following illustrates two methods of correcting for the high
static pressure span shift. Examples follow each method.
Method 1 for High Static Line Pressure, Ranges 4 and 5
Adjust transmitter output while leaving the input pressure at
desired in service differential pressures. Use one of the
following formula sets (depending on the pressure units being
used to calibrate):
If using English Units (psi):
Corrected output reading at LRV =
4 mA + ((S X P/1000 X LRV)/Span) X 16 mA
Corrected output reading at URV =
20 mA + ((S X P/1000 X URV)/Span) X 16 mA
If using SI Units (MPa):
Corrected output reading at LRV =
4 mA + ((S X P/6,90 X LRV)/Span) X 16 mA
Corrected output reading at URV =
20 mA + ((S X P/6,90 X URV)/Span) X 16 mA
Where:
S = Value from Table 3-1 divided by 100
LRV = Lower Range Value
URV = Upper Range Value
P = Static Line Pressure
Span = Calibrated Span
Rosemount 2151N
1.00%
1.25%
32