3.26 Fumes in the resistance furnace
Pos: 3.53 /0010 E LTRA/0015 s ervice_instructio ns/CS-2000_s ervice/05Faults_C S-2000/0 645 Modul Fumes in the resistanc e furnace @ 9\ mod_1425541 226464_9.doc x @ 74429 @ @ 1
CAUTION! Never turn on the oxygen flow, when fumes come out of the furnace, or else
there can be an EXPLOSION!
Wait for at least 15 minutes, until the smoke has disappeared from the furnace before turning
on the oxygen supply!
When smoke comes out of the resistance furnace front, mostly the reason is that a sample is
entered into the hot zone of the furnace without having oxygen flow. If at that moment the
oxygen flow is restored, the gases in the furnace will ignite and explode with a loud bang and
with a flame shooting out of the combustion tube.
The explosive gases consist of carbon monoxide from carbon in the sample and (very little)
oxygen from the air which was in the combustion tube and of volatiles driven out of the sample
by the temperature without burning due to missing of oxygen.
Other possible reasons:
– It is a sign of bad combustion. See chapter “Bad combustion”.
– The furnace temperature is too low.
– No oxygen flow. See chapter “No oxygen flow”.
– The pressure switch is faulty.
– The oxygen inlet valve V5 is faulty. See chapter “Wiring diagrams”. Check for pressure
response. Unscrew the lower tube (1). The oxygen must exit the valve when the mains
power switch is set to pos. 2.
If not:
– There is no voltage (220 V) on the leads (2) of the coil (4.)
– The valve is blocked. Clean the valve by
a) closing the oxygen supply,
b) setting the mains switch to pos. 0
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