Rosemount 3152 - Page 40

Rosemount 3150 Series
Reference Manual
00809-0100-4835 Rev BD
July 2016
3-13
Figure 3-8 outlines examples of calculating a High Static Line
Pressure Span Correction using Method 1. Figure 3-8a uses English
units (psi) while Figure 3-8b uses SI units (MPa).
Figure 3-8a – Example for High Static
Line Pressure, Span Correction using
Method 1 (English Units)
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 pis/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.
Figure 3-8b – Example for High Static
Line Pressure, Span Correction using
Method 1 (SI Units)
Range 4; for a calibration of –0,07 to 0,31 MPa corrected for 10,34 MPa
static line pressure:
1. Calculate the corrected output reading (at LRV)
= 4 mA + ((0,01 X 10,34 MPa/6,90 MPa X (-0,07 MPa))/0,38 MPa) X 16 mA
= 3,956 mA
2. Calculate the corrected output reading (at URV)
= 20 mA + ((0,01 X 10,34 MPa/6,90 MPa X 0,31 MPa)/0,38 MPa) X 16 mA
= 20,196 mA
3. At atmospheric static line pressure, apply 0,07 MPa to the low side
process connection (-0,07MPa), and adjust the zero until the
transmitter output reads 3,956 mA.
4. Remaining at atmospheric static line pressure, apply 0,31 MPa 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 10,34 MPa static line pressure, within
specified uncertainties, the output will be 4 mA at -0,07 MPa and 20 mA at
0,31 MPa.