Operation
multi EA 4000 Version 01.16 59
− In the sample in boat 1 the elementary carbon (EC) is determined. Before measur-
ing boat 1 the suction pump is switched off automatically and a change from oxy-
gen to argon is made. Now set the argon flow at the Ar/O
2
rotameter to 2.3 –
2.5 l/min. This flow configuration remains in place for subsequent pyrolysis meas-
urements.
− The sample in boat 1 is first pyrolized in the argon flow after expiry of the waiting
time (flushing the combustion tube with argon). At the preset temperature volatile
components of the enclosed carbon compounds escape. In the ideal case and / or
after appropriate pretreatment the elementary carbon (EC) remains on the boat.
− After pyrolysis a change from argon to oxygen is made and the suction pump is
switched on automatically. The share of the remaining carbon (EC) in the already
pyrolyzed sample is detected by combustion in the oxygen flow.
− The sample in boat 2 is converted in the oxygen flow to detect the total carbon
content (TC).
− From the difference of the two measured values (TC and EC) the volume of de-
gradable or active carbon can be deducted.
IMPORTANT
During prolonged pauses during measurement the gas supply can be switched off in the
multiWin program saving oxygen accordingly. However the oxygen supply must be available
again in time (approx. 10 min) before starting the measurement.
7.4 Cl detection
7.4.1 Preparing the multi EA 4000 for Cl measurements
OCK!
Lethal voltages may occur in the combustion furnace. The combustion tube is part of the
cover of live components.
Therefore, only switch on the analyzer with the combustion tube
inserted! For conversion
and maintenance activities at the combustion tube or combustion furnace, always switch off
the analyzer from the mains switch and disconnect the multi EA 4000 by removing the mains
plug from the mains network.
Insert the quartz tube into the combustion furnace
1. Fill the quartz tube with approx. 2.5 cm
quartz wool and push the cotton plug into
the end of the tube.
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