ABB ACF-NT Operator's Manual page 29

Cleaning/Replacing the Sample Gas Filter in the SC Block,
42/23-572 EN Rev. 5
Step Action
3 Remove the sample gas filter assembly from the sample conditioning
block and disassemble it.
1 2
4 Clean the sample gas filter 6 in an ultrasonic bath. Use an aqueous
cleaner (e.g. Extran). Wash the filter element several times with
distilled water and acetone and dry it thoroughly. If a VOC analyzer is
integrated in the analyzer system all hydrocarbons must be removed
to avoid drift of the VOC analyzer.
5 Replace the O-ring 3 in the sample gas filter cover 2.
Replace the O-ring on the back of the bottom plate 4 (not visible in
the photo) and the two PTFE profile gaskets 5.
Always use new O-rings and gaskets with a cleaned sample
gas filter. Contaminated or damaged O-rings and gaskets will
reduce sample gas path seal integrity and lead to erroneous
measurement values.
6 Re-assemble the sample gas filter assembly and place it in the sample
conditioning block.
7 Place sample gas filter cover 2 on the sample conditioning block and
secure it with three mounting screws 1. Tighten mounting screws only
sufficiently to achieve metal-to-metal contact of the sample gas filter
holder.
Operator's Manual ACF-NT, ACF-NT V0309
3 4 5
continued
6 5 7 8
29