44
5 Maintenance
Table 5:Test gas composition
5.1.11 Checking/Calibrating with Reference Measurement
• The system must be in operation (ideally at the desired operating point).
• Perform the calibration as described in Chapters 5.1.2 Checking/Calibrating the O
2
Elec-
trode and 5.1.9.3 Perform a Calibration of the CO/H
2
Electrode .
Test gas
Composition
O
2
[Vol.%] CO
e
[ppm] N
2
[Vol.%]
A 21 0 Rest
B 3 0 Rest
C 3 300 Rest
*
CO Equivalent CO
e
is the sum of all components in the exhaust gas. In test gases, it is represented by CO and H
2
in pro-
portion of 2:1, e.g. 300 ppm CO
e
= 200 ppm CO +100 ppm H
2
.
**
In the test gas device, the probe can be calibrated/tested with oil-free pressure air or synthetic air from test gas bottle. In
a CO
e
-free and defined surrounding, the probe can also be tested/calibrated outside of the test gas device.
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