: Gas-flow diagram - furnace closed
This happens when there is no restrictor in the left hand fitting of the valve V3 or when the
internal diameter of the restrictor is too large. This can easily be checked when removing the
connected tube.
The restrictor should have an internal diameter of 1 mm.
See draft “Gas-flow diagram - furnace closed”
in the chapter “Modification Overview”.
The sample material is causing dust:
This will be caused mainly through tin analysis. Tin causes a light grey dust. The same problem
appears when tin is used as accelerator. Therefore using tin as accelerator should be avoided.
Also the tungsten – tin mixture shouldn’t be used. Almost all different materials can be analyzed
without the need of tin accelerators.
See Operation Manual chapter “Applications”.
Usage of other materials:
Cast-iron causes brown dust during the analysis.
When the dust is yellow, too much tungsten is used as accelerator. If the dust is brown, too
much iron accelerator is used.
See Operation Manual chapter“Applications”.
Pos: 3.16 /0025 Üb erschriften/E LTRA 1.1 Übersc hriften/11 Erratic results @ 8\ mod_13968 82131370_9.doc x @ 60214 @ 2 @ 1
3.8 Erratic results
Pos: 3.17 /0010 E LTRA/0015 s ervice_instructio ns/CS-2000_s ervice/05Faults_C S-2000/0 545 Modul Erratic results @ 9\m od_14255396 99891_9.docx @ 74189 @ @ 1
There are a lot of different reasons for this
– Saturated chemicals or clogged dust filter
– Heterogeneous samples
– Leakage
– Flow problems
– The electronic noise or drift of the infrared signal
– It can happen quite often that the combustion start is delayed and the analysis
time is too long
– Incomplete or bad combustion
– Too high blank value for the crucible and tungsten. This will be especially noticeable,
mostly though, in the low carbon channel
– Widely different weights of sample and accelerator (tungsten)
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