Ametek Land LANCOM 4 - CO₂ Sensor Zero Calibration; Oxygen Sensor Zero Calibration

10 - 5
Lancom 4Portable Flue Gas Analyser
User Guide
10.6 Carbon Dioxide Sensor Zero Calibration
It is recommended that the CO
2
Zero Calibration is performed immediately
prior to the CO
2
Span Calibration.
The method for this zero calibration is the same as for span calibration.
When performing a zero calibration it is important to use a calibration gas
containing no CO
2
.
Nitrogen or another calibration gas can be used, for example the calibration
gas used to calibrate the NO sensor. Do not use air as it contains
approximately 400 ppm of CO
2
.
10.7 Oxygen Sensor Zero Calibration
A zero calibration gas, for example CO in N
2
, containing no oxygen is
required for this check.
1) Connectthesampleprobe,oruseanylonhoseconnectorintheuegas
connection.
The analyser should be sampling clean, fresh air.
2) From the main menu select Readings.
The oxygen reading should be between 20.7% and 21.2 %.
3) Press the Home key to return to the Main Menu and select Diagnostics.
4) Select Cells.
The oxygen sensor should be between 1.6 and 2 V. If the reading is out
of this range replace the oxygen sensor.
5) Connect the analyser to the calibration gas supply. Wait for the gas
readings to settle, about 5 minutes.
6) On the Readings screen, the oxygen value should be below 0.3%.
If this is not the case, check all of the pipe connections are tight both
in the analyser and in the test equipment, it is likely that there is an air
leak.