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Temperature (°C)
Relative Humidity (% RH)
Atmospheric Pressure (mbar)
The
FireStingGO2
device with the built-in humidity and pressure
sensors together with the connected temperature sensor can
measure (and compensate) these parameters automatically.
12.1.1
Ambient Air
If ambient air is used as the air calibration standard, there is no
need for preparation. The dry oxygen sensor, optionally together
with the dry temperature sensor, is simply exposed to the ambient
air. Otherwise, follow the calibration procedures described in
chapters 6.3.2 (device) and 10.3.3 (software).
For precise calibration in ambient air, it is important that the
measuring tips of the oxygen and the temperature sensor are
completely
dry
. Wet sensor tips will cause undefined humidity
levels around the sensor tips. And even worse, the evaporation of
water drops would cool down the sensor tips causing undefined
temperatures.
12.1.2
Water-Vapor Saturated Air
Enclose wet cotton wool into a flask (e.g. DURAN flask) with a lid
prepared with holes for the oxygen sensor and a temperature
sensor from
PyroScience
. Typically about 1/3 to 1/2 of the flask
volume is filled with the wet cotton wool, while the other volume
fraction is left free for inserting the tip of the oxygen sensor, and
optionally also the temperature sensor. Follow the calibration
procedures described in chapter 5.2.2.
12.1.3
Air Saturated Water
Fill an appropriate amount of water into a flask (e.g. Duran flask)
with a lid prepared with holes for inserting the oxygen sensor and a
temperature sensor. Stream air through the water for about 10 min
