146 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Simplified seal integrity test via FID
This method can be employed only if an FID is built into the analyzer system.
It is based on allowing hydrocarbon to act on any leaking points in the sam-
ple gas path and observing the measured value on the FID at the same time.
A commercially available felt pen is used as a punctiform "Hydrocarbon
source" for this purpose.
1 Starting at the sample gas sampling probe and working towards the
analyzer cabinet, hold the felt pen for a few seconds close to each fit-
ting, connection and screw.
2 Observe the FID measured value. In the presence of a leak, the measured
value rises and drops back to the normal value relatively quickly. Due to
the calibration times, the measured value can rise after a delay; after
each “contact” with the felt pen, wait at least 2 minutes for a possible
reaction.
3 Open the cover of the ASP block and hold the felt pen for a few seconds
close to the sample gas line connection at the ASP block.
The ASP block is hot (approx. 180°C)!
Wear suitable protective gloves and safety goggles!
Other indications of leaks
The following states can indicate a leak in the analyzer system:
The SGI and SGO pressures to be regulated by the analyzer system are
no longer reached.
The controlled variables for the SGI and SGO pressures in control mode
are too great (> 90).
The position variables can be found in the menu under
Diagnosis/Information → Module-specific →
Controller measured values → FID.
The measured oxygen concentration is much higher than the expected
values.
This is only a possible indication of a leak. The absence of the states men-
tioned must not be used to conclude that the analyzer system is tight.
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