ELTRA CS-2000, Руководство по обслуживанию

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Fig. 24: Analysis time
The analysis respectively the combustion, takes normally a maximum of 100 seconds. At the
beginning of combustion, the IR-cells signals start going up on the computer screen, reaching a
peak maximum depending on the C resp. S concentrations in the sample. When the signal
comes down, the analysis will be terminated when the signal has reached a comparator level.
The value of this comparator level is entered in the configuration window of the software.
If, for some reason, the signal may not come down to the comparator level, the analysis is
terminated when the maximum analysis time expires. This time is also entered in the
configuration window.
The analysis stops also when the maximum analysis time expires before the signal comes down
to the comparator level.
The meaning of setting a maximum analysis time is to protect the induction generator from
overheating, in case the signal may not come down to the comparator level. One reason why
the signal not to come down to the comparator level is that Hydrocarbons from the oxygen burn
on the hot crucible, preventing the IR-signal from coming down to zero resp. down to the
comparator level. One more reason is a too low comparator level, so that a small positive drift of
the base line during analysis makes the base line higher than the comparator level at the end of
the combustion. In such cases, the comparator level should be set higher.
The comparator level value entered into the configuration window is a minimum value which
increases according to the peak maximum of each analysis. During combustion, the software
takes the peak maximum to add to the entered comparator value an additional amount
depending on the actual peak maximum.