Rosemount 3152, Справочное руководство

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Rosemount 3150 Series
Reference Manual
00809-0100-4835 Rev BD
July 2016
3-15
Figure 3-9a – Example 1 for High
Static Line Pressure, Span Correction
using Method 2 (English Units) Range 4 for a calibration of 0 to 45 psi corrected for 1,500 psi static line
pressure
1. In this example LRV is 0 psid. Zero differential pressure points
require no span correction.
2. Calculate the corrected URV pressure input
= 45 psi – ((0.01 X 45 psi) X (1500 psi/1000 psi))
= 44.325 psi
3. At atmospheric static line pressure, with zero differential pressure
applied, adjust the zero until the transmitter output reads 4 mA.
4. Remaining at atmospheric static line pressure, apply 44.325 psi to
the high side process connection and adjust the span until the
transmitter output reads 20 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 0 psi and 20 mA at 45 psi.
Figure 3-9b – Example 1 for High
Static Line Pressure, Span Correction
using Method 2 (SI Units) Range 4 for a calibration of 0 to 0,31 MPa corrected for 10,34
MPa static line pressure
1. In this example LRV is 0 MPa. Zero differential pressure points
require no span correction.
2. Calculate the corrected URV pressure input
= 0,31 MPa – ((0,01 X 0,31 MPa) X (10,34 MPa/6,90 MPa))
= 0,305 MPa
3. At atmospheric static line pressure, with zero differential pressure
applied, adjust the zero until the transmitter output reads 4 mA.
4. Remaining at atmospheric static line pressure, apply 0,305 MPa to
the high side process connection and adjust the span until the
transmitter output reads 20 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 MPa and 20 mA at 0,305
MPa.