Reference Manual
00809-0100-4835 Rev BD
July 2016
Rosemount 3150 Series
3-12
Correction for High Static
Line Pressure
High Static Line Pressure Span
Effect on Range Codes 1, 2 and 3
DP Transmitters
Rosemount 3150 Series 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.
High Static Line Pressure Span
Correction for Range Code 4 and 5
DP Transmitters
Rosemount 3150 series 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 3-2
Table 3-2 – Range 4 and 5 Correction
Factors
Range 4 and 5 Span Correction Factor
% Input Reading per 1000 psi (6,90 MPa)
Range 4
1.00%
(1)
Range 5
1.25%
(1)
(1) Correction factors have an uncertainty of ±0.20% 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 on 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 3-2 divided by 100
LRV = Lower Range Value
URV = Upper Range Value
P = Static Line Pressure
Span = Calibrated Span
NOTE
For corrections where the calculated output adjustment exceeds the
output high or low adjustment limits, the pressure input adjust
procedure described in Method 2 (see pg. 3-14) is recommended.
Summary of Contents for 3152
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