69
Abb. 42: Oscillator
Blow the dust away with compressed air. Blow from the inside to the outside,
otherwise the dust will be blown into the oscillator. Take care of the rotary speed of
the blower to remain within the operation limits. When blowing compressed air, the
rotary speed of the blower can exceed the limit of operation causing damage to the
bearings and to the shaft.
Pos: 5. 57 /00 20 Übers chrif ten/E LTRA 1.1 Übers chri ften/1 1 Anal ysis c ycle sto ps befor e the pea k begi ns ELTRA @ 6\mod_1368708916668_9.docx @ 41297 @ 233 @ 1
3.26 39BAnalysis cycle stops before the peak begins
Pos: 5.58 /0 010 ELTR A/ 0015 s ervic e_i nstr uc tio ns/C S-800 _Ser vice/ 0015 F ehler/ 01954 5 Modul analysi s cycl e stops befor e the pea k begins E LTRA @ 6\ mod_1377688613716_9.docx @ 46819 @ @ 1
Reasons:
The minimum analysis time is set too short in the configuration window, so that the
analysis time expires before the peak starts. Normally the peak starts about 6 to 8
seconds after the start of combustion. If the minimum analysis time is set for
example to 4 seconds, the analysis may be terminated before the peak starts. If
the minimum analysis time is set far over 8 seconds, the peak starts before the
minimum time expires. Due to the IR signal being then higher than the comparator
level, the analysis continues until the IR signal comes down to the comparator
level, unless the maximum analysis time expires earlier. If so, it is advisable to
increase the maximum analysis time in order to integrate the whole peak.
If after prolongation of the minimum analysis time to a reasonable value, a peak
still doesn't appear, possible reasons for the fault are:
– No combustion.
– There is no gas flow.
– There is gas flow, but bypassing the furnace, so that there is gas flow shown
on the flow meter and by the flow sensor on the screen but no gas flow thru
the furnace. In this case the bypass valve V4 jams, keeping the oxygen flow
bypassing the furnace like in case of open furnace. The furnace has though
oxygen pressure but without having oxygen flow. Due to oxygen being
present, the metal sample and accelerator(s) burn, because there is
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