56
NOTE
: If using retractable needle-type sensors (e.g.
OXR50
,
OXR230
,
OXR430
), it is important that the sensor tip is extended to
position 2 or 3 (see chapter 5.1) when the calibration value is taken.
7.1.4
Calibration Mode: 2-Point in Ambient Air
NOTE
: The calibration
2-Point in Ambient Air
is only possible if
the
correct Sensor Code
has been entered in the
Settings
(see
chapter 6.2).
In the calibration mode
2-Point in Ambient Air
both the air
calibration value and the 0% calibration value are determined from
a manual calibration. Ambient air is used for determining the air
calibration value and a specially prepared 0% calibration standard
for determining the 0% calibration value. The preparation of
appropriate 0% calibration standards is explained in chapter 8.
Note, that this calibration mode will automatically read the
atmospheric pressure and humidity from the internal pressure and
humidity sensor in the
FireStingO2
. The temperature of the
ambient air needs to be determined. Either, a
Fixed Temperature
is adjusted manually, or the temperature is read from the external
temperature sensor by selecting
External Temperature Sensor
.
