Calibration procedure of O2-METER and CO2-METER
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Calibration procedure for LAMBDA CARBOMETER (CO2-Meter)
The CO2 concentration can be calibrated on the LAMBDA CARBOMETER (CO2-Meter).
The calibration is a two-point calibration consisting of zero-setting and sensitivity setting:
Zero setting
On the back side of the LAMBDA CARBOMETER (CO2-Meter) there are two buttons
labeled
N2
and
Air
. These buttons are used for the zero setting of the instrument.
Connect a source of nitrogen (N2) gas to the CARBOMETER input barb. The gas flow rate
should be around 200 ml/min. The display shows a value, which is gradually stabilizing
and approaching zero. After the value on the display stabilizes, press the button in the hole
on the rear side labeled
N2
. The display shows
“0.00”
.
A simpler but less accurate way is to use an air flow for the zero setting (air flow rate
should be around 200 ml/min). In this case, after the value on the display stabilizes, press
the button in the hole on the rear side labeled
Air
. The display shows
“0.04”
,
which
corresponds to the expected concentration of CO2 in air (400 ppm).
Sensitivity setting
Connect a source of known concentration of CO2 to the CARBOMETER input barb. The
gas flow rate should be around 200 ml/min. The display will stabilize with the actual value
of CO2 concentration. After the actual value of CO2 concentration has stabilized the
correction factor can be calculated as the ratio between the real CO2 concentration and
the actual measured CO2 concentration.
Unplug the power supply and continuously press the
button located below the highest
order digit
of the display and reconnect the power supply. The display shows
“SLP”
and
then the value of the correction factor. Use the
buttons under the display to set the
desired value of the correction factor and press button
↵
. The correction factor is saved,
the display shows the actual CO2 concentration and the CARBOMETER is switched to
operation mode.
