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Faults

When the pulses at TP13 are present without starting analysis and with 12 V DC at TP9, then

the circuit board HF 42 is out of order.

If no scope is available, the pulses can be detected by using a voltmeter.

Normal values are about 0 V AC without pulses, and about 1 V AC with pulses.

This indicated value can be different, depending on the type of the voltmeter used.

If this AC voltage is practically zero but even though the generator is powered, the next possible

reason: The triac is faulty (short circuit), and has to be replaced.

Fig.

: Circuit board HF 42

Pos: 3.40 /0025 Üb erschriften/E LTRA 1.1 Übersc hriften/11 Cr ucible or boat cr acks or melts E LTRA @ 6\mo d_136870800 7091_9.doc x @ 41231 @ 2 @ 1

3.20 Crucible or boat cracks or melts

Pos: 3.41 /0010 E LTRA/0015 s ervice_instructio ns/CS-2000_s ervice/05Faults_C S-2000/0 615 Modul Crucibl e cracks or m elts @ 9\mod_ 1425540955461 _9.docx @ 7435 7 @ 33 @ 1

3.20.1 Induction furnace

One reason could be that the quality of the crucible is bad. Use a better quality.

Another reason could be that the furnace temperature is too high, due to:

– Excessive main voltage.

– Excessive sample and / or accelerator weight.

– The use of a "sample or accelerator" that requires lower generator power.

In this case reduce the generator power in case of induction furnace. See chapter „Induction

generator control“.

3.20.2 Resitance furnace

In case of resistance furnace, the boat melts when there is excessive amount of metal in the

combustion boat. The dangerous thing is that the molted metal destroys not only the boat but

also the combustion tube, finally dropping thru the tube on the thermocouple. It is then very hard

to remove the deformed tube from the furnace even after breaking it in two.

Pos: 3.42 /0025 Üb erschriften/E LTRA 1.1 Übersc hriften/11 O xygen pressur e goes up ver y slowly @ 9\ mod_142554847542 0_9.docx @ 74976 @ 2 @ 1

3.21 Oxygen pressure goes up very slowly

Pos: 3.43 /0010 E LTRA/0015 s ervice_instructio ns/CS-2000_s ervice/05Faults_C S-2000/0 620Modul The oxyg en pressure g oes up very slo wly @ 9\mod_ 14255409992 19_9.docx @ 743 69 @ @ 1

When using induction furnace operation:

After the button has been pressed to close the furnace (or to start the analysis by closing the

furnace first ), the oxygen gauge (6) should reach the normal level of

1,5 bar within a couple of seconds after the furnace has closed.

If this takes longer:

Then the problem is most probably outside the analyser.