I
NITIAL
S
TARTUP AND
C
ALIBRATION
748250-L Rosemount Analytical October 1999
3-13
Model 880A Non-Dispersive Infrared Analyzer
SHIFT
Press and to toggle
linearizer ON/OFF.
ENTER
LINEARIZER
AO = _X.XXXXXXX
LIN: ON RANGE: X
AO = X.XXXXXXX
AO = X.XXXXXXX
SHIFT
SHIFT
TO PREVIEW VALUES:
Press to preview values for A1, A2, A3, A4
WITHOUT CHANGING THOSE VALUES.
TO CHANGE VALUES:
will move cursor right
and will change (toggle) values of
each character (Blank space
after “=“ indicates the sign of
the coefficient).
will move to next coefficient.
and will return analyzer to RUN MODE.
ENTER
ENTER
SHIFT
ENTER
The analyzer is linearized with the following fourth-order polynomial:
Y = A
0
+ A
1
X + A
2
X
2
+ A
3
X
3
+ A
4
X
4
Where X is the nonlinear input; A0, A1, A2, A3 and A4 are the linearization
coefficients; and Y is the linear output.
Linearization coefficients can be developed for each range and stored in the analyzer
using the front panel keypad. The operating range is selected by entering RANGE = 1,
2, or 3 in the Range Mode. Coefficients for the selected range are automatically used,
independent of the position of Range = n, from the Linearization Mode (except for the
ALL Range selection).
F
IGURE
3-8. L
INEARIZER
M
ODE
3.10.1 A
LL
R
ANGE
The “All” range is a special feature that allows the user to use Range 3 coefficients for
all three ranges. It should only be used over dynamic ranges of 3:1 or less. If Range A
is selected in the Linearization Mode, the microprocessor will use the coefficients in
Range 3. Also, if the linearizer is ON and in Range A, the microprocessor will use the
GAIN and TIME CONSTANT from Range 3, regardless of the GAIN and TIME
CONSTANT selected for Ranges 1 and 2.
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