Emerson Rosemount 2151N Reference Manual page 42

Rosemount 2151N
Figure 3-9 – High Static Line
Pressure Span Correction using
Method 1 Example
Figure 3-9a – Example for High Static Line
Pressure Span Correction using Method 1
(English Units)
33
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. 34) is
recommended.
Figure 3-9 outlines examples of calculating a High Static Line
Pressure Span Correction using Method 1. Figure 3-9a uses
English units (psi) while Figure 3-9b uses SI units (MPa).
Range 4 for a calibration of –10 to 45 psi corrected for
1,500 psi static line pressure:
1. Calculate the corrected output reading at LRV
= 4 mA + ((0.01 X 1500 psi/1000 psi X (-10 psi))/55
psi) X 16 mA
= 3.956 mA
2. Calculate the corrected output reading at URV
= 20 mA + ((0.01 X 1500 psi/1000 psi X 45 psi)/55 psi)
X 16 mA
= 20.196 mA
3. At atmospheric static line pressure, apply 10 psi to the
low side process connection (-10 psi), and adjust the
zero until the transmitter output reads 3.956 mA.
4. Remaining at atmospheric static line pressure, apply
45 psi to the high side process connection and adjust
the span until the transmitter output reads 20.196 mA.
5. Check to assure desired outputs are achieved and
repeat steps 3 and 4 if necessary.
When the transmitter is exposed to 1,500 psi static line
pressure, within specified uncertainties, the output will be 4
mA at -10 psi and 20 mA at 45 psi.
Reference Manual
00809-0000-4851 Rev AD
December 2023
Calibration