triOS nanoFlu - Page 24

22 D01-060en202008 Manual nanoFlu
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Calibration // nanoFlu
4. The scaling factor can be calculated using the following equation
scaling factor =
With lab for the laboratory values and measuredvalue for the values output by the sensor.
For the previous example in the gure, this means:
scaling factor = = 3
5. If a non-contaminated sample is not available, at least two samples with very di󰀨erent levels of contami-
nation are needed. In this case, you will rst calculate the scaling factor.
scaling factor =
Calculation of the o󰀨set without zero-point measurement (1.):
oset = measuredvalue2 -
measuredvalue2 should be signicantly larger than measuredvalue1. The o󰀨set can also be found using
the abscissa of the straight line (intersection with X axis). For the above example, this means:
scaling factor = = 3
oset = 40 - = 40 - 30 = 10
(lab2 - lab1)
(measuredvalue2 - measuredvalue1)
lab
measuredvalue2 - oset
90 mg/L
(40 - 10) mg/L
lab2
Scaling factor
90
3
90 - 30
40 - 20
Offset = 10 (Abszisse)
1
2
Laboratory value for the test substance [µg/L]
Measured concentration [µg/L]
O󰀨set = 10 (abscissa)