45
5 Maintenance
5.2.1
Scope
Adjustments must be made separately for each measuring range.
●
Zero point
●
Sensitivity
A
NOTICE!
For each measuring range always adjust the zero point
first, followed by the sensitivity.
5.2.2
Suitable test gas concentrations
The following test gas concentrations can be used for adjustment:
Zero point
Measuring range sensitivity
H2 PPM adjustment
H2 adjustment
Fresh air
H
2
in synthetic air
●
1 ppm
●
10 ppm
●
100 ppm
●
1000 ppm
●
1.00 % vol.
H
2
in N
2
●
5 – 100 % vol.
It is not necessary to use all test gas concentrations to adjust a
measuring range. However, adjusting with more than one test gas
concentration increases the measurement quality.
SEWERIN recommends the following test gas concentrations for
adjusting the sensitivity:
●
H2 PPM adjustment
: 100 ppm H
2
in synthetic air
●
H2 adjustment
:
5 % vol. H
2
in N
2
