Milestone Srl MA213-003 – DMA-80 EVO – User Manual
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Drying and decomposition steps: Here you can choose the best values of
time and temperature of the different drying and decompositions steps of your
analysis method.
This phase happens in the first empty part of the catalyst tube (ashing chamber,
furnace 1) which is surrounded by an heating coil and the temperature is
controlled by a thermocouple installed in the sample boat holder.
Ideal method graph: graphic representation of your analysis method where the
following steps are also shown by a coloured bar:
- Drying/decomposition time: red colour
- Purge time: grey colour
- Amalgamator heating time: purple colour
- Signal recording time: blue colour
Drying and decomposition parameters can be entered or modified also
graphically by selecting the position that must be entered new or modified. The
position will appear with purple background. Change the Temperature and the
Time by pulling the arrows into the desired position.
Time t can be entered in 10 seconds increments, and Temperature T in 10°C
increments.
Description: here you can enter all information regarding you method
Max. start T: The measurement only starts when the temperature of the ashing
oven (furnace 1) has dropped below the maximum starting temperature. This
would avoid evaporation of the sample (in case of liquid) before closing the
catalyst flange.
Purge time P: It is the time elapsing between the end of drying/decomposition
phase and the start of the Hg measurement (amalgamator heating). Purging
time is set and saved for each method (standard setting is 60 seconds).
During and after the decomposition, all pyrolysis gases are transported with the
oxygen flow from the catalyst to the amalgamator. Hg is trapped in the
amalgamator and all the other gases are flushed out from the system before Hg
is measured in the cuvette. Only in this way a matrix-free measurement can be
carried out.
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