19
4.7.5 Readjustment with test gas i A distinguishing feature of the exhau-
st-gas analyzer module is the excel-
lent long-time stability of its measu-
ring accuracy. Despite this, the ex-
haust-gas analyzer may be required
by law or by the regulations of appro-
val authorities to be recalibrated with
calibrating gas at given intervals.
To recalibrate the exhaust-gas analyzer,
you will need a calibrating-gas mixture
with the following concentrations (depen-
ding on requirements):
HC: 400 to 2000 ppm vol C
3
H
8
,
entry
in propane
CO: 1% to 10% vol CO
CO
2
: 5% to 18% vol CO
2
Using the keyboard, enter the calibrating-
gas values for CO as stated on the certi-
ficate.
Confirm your entry of these values by
clicking OK or by pressing E.
Using the keyboard, enter the calibrating-
gas values for CO
2
as stated on the certifi-
cate.
Confirm your entry of these values by
clicking OK or by pressing E.
Using the keyboard, enter the calibrating-
gas values for HC as stated on the certif-
icate.
Confirm your entry of these values by
clicking OK or by pressing E.
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