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Reference Manual
00809-0100-4388, Rev BA
January 2008
Rosemount 1153 Series D
3-10
7. Calculate full-scale adjustment correction in terms of pressure:
8. Repeat step 4 with the results of step 7:
9. Repeat step 5 with the result of step 8:
10. Add the mA correction to the ideal full-scale output (20 mA). This is
the corrected ideal full-scale output.
11. Readjust zero and span adjustments for corrected outputs:
3.964 mA at –100 inH
2
O
20.108 mA at 300 inH
2
O
There is an uncertainty of ±0.5 percent of input reading per 1,000 psi
associated with the span correction.
Zero Zero shift with static pressure is not systematic. However, if the calibrated
range includes zero differential pressure, the effect can be trimmed out after
installation and with the unit at operating pressure.
Equalize pressure to both process connections, and turn the zero adjustment
until the ideal output at zero differential input is observed. Do not readjust the
span potentiometer.
If the transmitter does not include zero differential pressure within its
calibrated span, the zero effect or zero correction can be determined before
the unit is suppressed or elevated to eliminate the zero effect after correcting
for the span effect.
The following procedure illustrates how to eliminate the zero effect for a
non-zero differential pressure calibration. The example uses a Range 5
calibrated from 100 to 500 inH
2
O with 1,200 psi static line pressure.
0.9 % 300 inH
2
× O 2.7 inH
2
O=
2.7 inH
2
O
400 inH
2
O input span
----------------------------------------------------------- 0.675 % span=
0.675 % 16 mA span× 0.108 mA=
20.00 mA 0.108 mA 20.108 mA=+