Model NGA2000 PMD
Instruction Manual
Menu: 96 UNITSI1
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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Menu: 97 POLYSETI2
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: 98 POLYSETI3
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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Rosemount Analytical Inc. A Division of Emerson Process Management | Appendix A. Menu Displays |