59
8011703/XF49/V3-1/2019-09| SICK
O P E R A T I N G I N S T R U C T I O N S | VICOTEC320
Subject to change without notice
MAINTENANCE
9
9.2.6.1
Determination and setting of the span factors
The span factors for the VIS, NO and NO
2
cuvette must be determined using calibrated
neutral density filters (VIS) or gas cuvettes (NO, NO
2
).
VIS measurement
Calculate the span factor according to the following equation:
NO/NO
2
measurement:
Calculate the span factor according to the following equation:
The determined span factors must fulfil the following criteria.
Enter span factors
Fig. 43: Menu Parameter/Spectral analysis
1
Open “Parameter/Spectral analysis” in the SOPAS menu tree.
2
Enter span coefficient NO/NO2.
VIS
NO
NO
2
2 x filter 2039966
NO Mid 2043200
NO
2
High 2043204
Nominal value of neutral density filter
Measured value of neutral density filter VIS measurement offset
–
---------------------------------------------------------------------------------------------------------------------------------------------------------------
span
NO/NO2
Nominal value of cuvette
Measured value of cuvette
---------------------------------------------------------------
=
Span factor
SOPAS variable
Nominal/
typical
Lower
tolerance
Upper
tolerance
VIS
VIS_coeff
1
0.85
1.15
NO
NO_coeff
1
0.7
1.3
NO
2
NO2_coeff
1
0.7
1.3
