5
Operation and settings
5200-en_V2.0_06/20
71
5.5.2
Adjusting measuring algorithm
The PM fractions are calculated with the slope and intercept parameters.
The defaults of the parameters are:
• Slope = 1
• Intercept = 0
TÜV Rheinland recommendation for calculation of PM fractions
PM
2,5
and PM
10
TÜV Rheinland tested the Fidas 200 S measuring system to determine suit-
ability for testing airborne particles of fractions PM
2,5
and PM
10
and then is-
sued two reports recommending the device for such testing.
Statements:
• Report, number 936/21218896/A dated September 20, 2014
• Report, number 936/21227195/A dated March 9, 2015
The reports indicate that the measurement results related to gravimetry can
be optimized by modifying the slope and the intercept of data conversion.
Optimum correlation according to TÜV Rheinland:
PM
10
slope = 1.058
PM
10
intercept = -1.505
PM
2.5
slope = 1.076
PM
2,5
intercept = -0.339
The TÜV Rheinland recommendations can be applied by changing the re-
spective values of the four parameters of the file
promo.ini
:
Parameters of file
promo.ini
Default
Setting recommended by TÜV Rhein-
land
PM10_slope=
1.000
0.945
PM10_intercept=
0
1.422
PM2.5_slope=
1,000
0.929
PM2.5_intercept=
0
0.315
We recommend reading the data with the default and offsetting it in your
own database and calculating the respective values.