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.
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