Fault removal
118 Edition 01/2016 multi EA 4000
9.6.5 Measurements in pyrolysis mode (EC)
Results of elementary carbon too low (after pyrolysis)
− Waiting time to display the oxygen
with argon in the combustion tube
chosen too short
− Waiting time after changing from oxygen to
argon supply should be at least 60 s.
Results of elementary carbon too high (after pyrolysis)
Cause Solution
− Pyrolysis time selected too short
− The pyrolysis time should be at least 3 min. to
ensure that all organic compounds have been
dissolved and purged completely.
− Pyrolysis temperature chosen too
high
− At temperatures above 1000 °C soot is in-
creasingly formed from organic compounds
(plastics) through "coking", which is also de-
tected in stage 2 as elementary carbon. The
optimum furnace temperature for pyrolysis
measurements is 850 °C.
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