Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 43 von 83
Calibration on the tower is followed by a comparison under indoor conditions:
In the room air comparison, the spectrometer candidate is compared to the same reference unit to de-
termine the agreement under indoor conditions. If the spectrometer candidate keeps the count numbers
within a channel with a tolerance of ±3% compared to the reference unit for a concentration of more
than 500 particles per litre of air, it is considered successfully calibrated.
The following screenshot from the GRIMM calibration software CalSoft is provided for clarification. What
are known as “ramps” show an example of the measured particle concentration for a candidate com-
pared to the reference unit, respectively after calibration.
After the dolomite comparison, the spectrometer is subject to a room air comparison. This room air
comparison is numerically evaluated and part of the delivery record.
Figure 3-4: Calibration; Simultaneously measured particle concentration
for a 31 size channel of the candidate (blue) and the reference unit (red) vs. time
(test ramp with dolomite on the calibration tower
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