Rosemount 890, Инструкция по эксплуатации

Страница: 48 / 96

I
NITIAL
S
TARTUP AND
C
ALIBRATION
Rosemount Analytical 748460-A January 2000
3-18
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
0
ACTUAL CONCENTRATION
ppm
READING
% FULLSCALE
10
20
40
50
60
70
80
90
100
30
Response with linearizer OFF
Concentration range = 0 - 5000 ppm
After taking the data points, the user may determine coefficients for user-specific gas
by either using any program capable of calculating a fourth order curve fit or calling the
factory to have the specific coefficients calculated.
When entering user-determined coefficients, note that the microprocessor only
recognizes five significant figures to the right of the decimal point (i.e., 0.12345). Also,
the user should ignore the three non-significant digits as they may change value while
the significant digits are being changed. The values of the non-significant digits do not
affect the instrument's linearity.
F
IGURE
3-10. C
ONCENTRATION
C
URVE
F
IGURE
3-11. C
URVE
, N
ORMALIZED
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
READINGS, NORMALIZED
(Axis Reversed)
CONCENTRATION,
NORMALIZED
Concentration range = 0 - 5000 ppm