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280
AO2000
CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
CAUTION!
The heated sample gas connection is hot (approx. 180 °C)! Allow the sam-
ple gas connection to cool down after switching off the power supply
(approx. 30 minutes).
1
Turn off the sample gas supply to the analyzer module.
Switch off 115/230-V-AC power supply of the gas analyzer and heater as
well as if necessary, the separate 24-V-DC supply of the analyzer module.
2
Loosen three mounting screws
1
and remove sample gas filter holder
2
from the sample gas terminal section.
3
Remove O-rings
3
and
4
as well as contaminated sample gas filter
5
from
the sample gas filter holder
2
.
4
Insert new sample gas filter
5
and new O-rings
3
and
4
into the sample
gas filter holder
2
.
NOTE: Always replace O-rings in conjunction with sample gas filter.
Contaminated or damaged O-rings impair the seal integrity of sample
gas path; this leads to erroneous measurement values.
5
Put sample gas filter holder
2
on the sample gas terminal section and
secure with the three mounting screws
1
. Only tighten mounting studs
until the sample gas filter holder touches the metal. When doing so, take
care that the O-rings
3
and
4
do not fall out from the sample gas filter.
6
Reconnect the sample gas supply to the analyzer module.
7
Activate the power supply.
8
Check output variables of the internal pressure regulator for the supply
gases and adjust if necessary (see section "Fidas24: Gas analyzer
start-up" (see page 129)).
9
Calibrate the gas analyzer at the end of the warm-up phase.