70
availability of oxygen in the furnace, coming thru the chamber valve V3
and/or thru the lance valve V2. In case of metal analysis, the burned sample
in the crucible looks like normally combusted sample. If so, check the bypass
valve V4.
– The IR call is faulty.
Pos: 5.59 /0 020 Über sc hrif ten /ELT RA 1.1 Über sc hri ften /11 C ho pper m otor do esn‘ t r otat e ELT RA @ 6 \mod_1368709089073_9.docx @ 41319 @ 31221 @ 1
3.27 40BChopper motor doesn‘t rotate
Pos: 5.60 /0 010 ELTR A/ 0015 s ervic e_i nstr uc tio ns/C S-800 _S ervic e/ 001 5 F ehler /01 955 0 M odul Cho pper m otor do esn‘ t r otat e E LTR A @ 6 \mod_1377688613914_9.docx @ 46831 @ 2 @ 1
The rotation of the chopper motor needs to be checked in case of problems only,
like when there are no combustion peaks on the screen or the IR signals are minus
-10V (take care, minus) displayed on the PC screen in the window “inputs”.
In order to check whether the chopper motor is rotating, the easiest way is to
remove an IR path.
See chapter IR-Paths cleaning and replacing.
Mostly, the easiest path to remove is the shortest one. Then, the chopper blade
can be seen thru the hole of the chopper housing, which becomes free (open) after
removing the path.
The reason of failure can be a faulty motor but also the controlling electronics of
the motor may have become defective. If so, the motor or the IRC board has to be
replaced. Before replacing, check at least the voltages on the board, mainly the
supply voltage of 24VDC.
See chapter Infrared base line adjustments.
For replacing the chopper see chapter Chopper.
Pos: 5.61 /0020 Überschriften/ELTRA 1.1 Überschriften/11 Sample burns but no peak on the screen @ 7\mod_1381400077047_9.docx @ 49828 @ 222 @ 1
3.28 41BSample burns but no peak on the screen
Pos: 5.62 /0 010 ELTR A/ 0015 s ervic e_i nstr uc tio ns/C S-800 _S ervic e/ 001 5 F ehler /01 955 5 M odul Sa mple bur ns but no pea k on scr een @ 7\ mod_1381400241865_9.docx @ 49839 @ 3 @ 1
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, causing the oxygen flow to bypass the
furnace like in case of open furnace.
See chapter “Gas flow regulation.
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
availability of oxygen in the furnace, coming thru the chamber valve V3 and/or thru
the lance valve V2. In case of metal analysis, the burned sample in the crucible
looks like normally combusted sample. If so, check the bypass valve V4.
Pos: 5.63 /0020 Überschriften/ELTRA 1.1 Überschriften/11 IR signal does not come down to the base li ne at th e en d of anal ys is @ 7\ mod_1381404509510_9.docx @ 49850 @ 31222 @ 1
3.29 42BIR signal does not come down to the base line at the end of analysis
Pos: 5.64 /0 010 ELTR A/ 0015 s ervic e_i nstr uc tio ns/C S-800 _Ser vice/ 0015 F ehler/ 01956 0 Modul IR sign al does n ot come do wn to the b ase lin e at the en d of anal ysis @ 7\ mod_1381404613105_9.docx @ 49862 @ 3323333 @ 1
There are several different reasons for this effect:
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