66 User Guide EN CheckPoint 3
P/N 340486-B
09/2017
Calibration
In addition to the annual factory calibration, the device normally does not require further
calibration. If, though, the device measurements deviates more than +/- 3% when measuring
gas with a known CO
2
content, the calibration function should be used.
NOTE! Calibration requires for special skills and the access to certified calibration
gasses. Invalid calibration compromises measurement results.
Always calibrate 0% CO
2
before you calibrate 100% CO
2
.
For the 0% CO
2
calibration, 100% N
2
, technical air or atmospheric air can be used.
When using atmospheric air, please ensure that there is no increased or unstable
CO
2
concentration in the surrounding air, as this may result in erroneous measuring
at relatively high CO
2
measurements.
Carry out any such calibration far away from the CO
2
application area, and ventilate
the device thoroughly using atmospheric air by carrying out 5 measurements with
"clean" atmospheric air before calibrating.
When using gas from bottles, e.g. for the 100% CO
2
calibration, the calibration gas
must not be forced through the device.
Instead you must let the needle suck the gas from an overflow to which between 0.2
and 1.0 l/min is supplied (see below).
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