ELTRA CS-800 Manual Download Page 70

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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 /0020 Übersc hrift en/ELTRA 1.1 Übersc hrift en/11 C hopper mot or does n‘t r ot at e ELTR A @ 6\ mod_1368709089073_9. doc x @ 41319 @ 31221 @ 1

3.27

40B

Chopper motor doesn‘t rotate

Pos : 5. 60 /0010 ELTR A/ 0015 s ervic e_ins truc tions/C S-800_Ser vic e/ 0015 F ehl er/ 019550 M odul C hopper mot or does n‘t r ot at e ELTR A @ 6\ mod_1377688613914_9. doc x @ 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 Übersc hrift en/ELTRA 1.1 Übersc hrift en/11 Sample burns but no peak on the s creen @ 7\ mod_1381400077047_9. doc x @ 49828 @ 222 @ 1

3.28

41B

Sample burns but no peak on the screen

Pos : 5. 62 /0010 ELTR A/ 0015 s ervic e_ins truc tions/C S-800_Ser vic e/ 0015 F ehl er/ 019555 M odul Sample burns but no peak on screen @ 7\ mod_1381400241865_9. doc x @ 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 Übersc hrift en/ELTRA 1.1 Übersc hrift en/11 IR signal does not c ome down t o the base line at t he end of anal ysis @ 7\ mod_1381404509510_9. doc x @ 49850 @ 31222 @ 1

3.29

42B

IR signal does not come down to the base line at the end of analysis

Pos : 5. 64 /0010 ELTR A/ 0015 s ervic e_ins truc tions/C S-800_Ser vic e/ 0015 F ehl er/ 019560 M odul IR signal does not c ome down t o the base line at the end of anal ysis @ 7\ mod_1381404613105_9. doc x @ 49862 @ 3323333 @ 1

There are several different reasons for this effect: