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Instruction Manual
760007-A
July 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Appendix A. Menu Displays 7-33
Model NGA2000 PMD
Units
Select the units in which you want the values to be
displayed. This does not affect the variable contents,
it merely affects how the control module display them.
Note that all analyzer ranges will be set as percent or
ppm, you can’t set some as ppm and others as percent.
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Polynomial set up
WARNING: The linearization curve must be monotonic.
If it is not, the calibration routine will fail and the
analyzer will not calibrate.
Test this by copying the values of the linearization
coefficients into a spreadsheet program and plotting
the result.
The analyzer does test for monotonicity when it spans,
but this test may not catch all possible errors.
Monotonic means that the curve does not roll over
and start going back down as the gas concentration
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K
Polynomial set up
When you have entered the desired number of
points, return to the polynomial set up screen, and
press
Polynomial, and store it as the coefficients in the
current range’s linearization function.
The order of the polynomial is optimized based on the
number of data points provided. You need at least 7
points for a fourth order polynomial correction.
You can modify the results with the piecewise linear
correction also provided in this section.
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Menu: 96 UNITSI1
Menu: 97 POLYSETI2
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