: Voltage across the heating elements
– Set the measuring range of a voltmeter to 1000 V AC. If the measured voltage is close to
220 V AC, then the heating elements are faulty.
– Replace the heating elements. See description in the operation manual.
– the measured voltage is much lower than 220 V AC, then the set value for the current
limit is too low, see chapter “Resistance furnace”.
A fault on the board TH-44 is also in question.
Pos: 3.48 /0025 Üb erschriften/E LTRA 1.1 Übersc hriften/11 Negati ve drift after start @ 9\ mod_1425549543 984_9.docx @ 75022 @ 2 @ 1
3.24 Negative drift after start
Pos: 3.49 /0010 E LTRA/0015 s ervice_instructio ns/CS-2000_s ervice/05Faults_C S-2000/0 635 Module Neg ative drift after start @ 9\mod_1 42554113027 5_9.docx @ 74 405 @ @ 1
This problem can appear in resistance furnace operation, when some material from previous
samples, fall off the combustion boat when shifted into the furnace. Then, when removing the
boat out of the furnace, the hot combustion boat may touch and burn this material, causing an
unwanted small peak on the base line.
If the following analysis is started while the base line is still above zero, then the electronics will
take this level as base line at the beginning of analysis so that the base line drifts negative when
that small peak comes down.
A problem of the IR-cell itself can be ruled out, when running a few blank analyses by just
entering manually a sample weight into the memory and pressing “START”, without inserting
any sample into the furnace. If the base line doesn’t show a negative drift, then the IR-cell is
O.K.
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