25
Now the Calibration Medium of the air calibration
standard needs to be defined as Ambient Air or
Water, depending on the environmental sample
under investigation.
It is recommended to perform the calibration in the same medium
as the one in the sample.
6.3.2.1
Calibration in Ambient Air
Calibration in ambient air is recommended, if the measurements
on the sample are done in the gas phase. During the calibration,
the atmospheric pressure and the relative humidity of the ambient
air will be read automatically from the internal air sensor (chapter
3.1.4). These readings are needed in order to calculate the actual
oxygen partial pressure in the ambient air.
Therefore, it is important that both the
FireStingGO
2
device and
the connected oxygen sensor are exposed to identical
environmental conditions.
Position the oxygen and the temperature sensor (if selected) close
to the air inlets on the right side of the
FireStingGO
2
display.
Ensure that the oxygen and temperature sensor are completely
dry; otherwise the relative humidity around the sensor will differ
from the measured humidity inside the
FireStingGO
2
.
It is strongly recommended that the device and the sensors are
placed for >30 min. under constant environmental conditions
before the calibration is performed.
