M&C TechGroup PMA 100 Operator's manual - Manual (Page 29)

9-3.12-ME M&C Products Analysentechnik GmbH
- 29 -
Example :
The residual oxygen percentage should be measured in a
closed 100% carbon dioxide (CO
2
) atmosphere. The „zero-
calibration“ is done by means of Nitrogen (N
2
).
According to the list of cross-sensitivities the error for CO
2
at 20
°
C is -0,27%. In order to obtain a higher accuracy this
means for the calibration that the reading should be
adjusted at +0,27% with N
2
, in order to compensate the
error of CO
2
.
Since the values of cross-sensitivities are based on 100 Vol.-%
of that particular gas, the error at 50 Vol.-% CO
2
and
50 Vol.-% N
2
is -0,135%.