Faults
61
3.26 Fumes in the resistance furnace
Pos : 3. 53 /0010 ELTR A/ 0015 s ervic e_ins truc tions/C S-2000_s er vice/ 05Faults _C S-2000/ 0645 M odul F umes in t he resis tanc e f urnac e @ 9\ mod_1425541226464_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
3
5
7
O
6
220 VAC
2
2
1
VAC
1-15-3
2
4
Содержание CS-2000
Страница 2: ...2 Copyright Copyright by Eltra GmbH Retsch Allee 1 5 D 42781 Haan Germany ...
Страница 6: ...Notes on service instructions 6 ...
Страница 72: ...Adjustments 72 Fig 57 Gas flow regulation The flow controller mainly consists of the following components ...
Страница 77: ...Adjustments 77 Fig 61 IRC 1 3 ...
Страница 107: ...Service 107 Fig 91 Tubes to squeeze ...
Страница 120: ...Miscellaneous 120 6 1 2 Left hand side Fig 106 Left hand side view ...
Страница 122: ...Miscellaneous 122 6 1 3 Right hand side Fig 107 Right hand side view ...
Страница 129: ...Miscellaneous 129 6 1 7 Infrared cell Fig 111 Infrared cell ...
Страница 139: ...Miscellaneous 139 Fig 119 Left hand side power wiring 6 2 3 Valve wiring ...
Страница 140: ...Miscellaneous 140 Fig 120 Valve wiring 6 2 4 Control signal wiring Fig 121 Control signal wiring ...
Страница 142: ...Miscellaneous 142 6 2 6 IR cell internal signals Fig 123 IR current supply new version ...
Страница 145: ...Miscellaneous 145 6 3 2 Gas flow for induction furnace when furnace is open ...
Страница 146: ...Miscellaneous 146 6 3 3 Gas flow for resistance furnace ...
Страница 147: ...Miscellaneous 147 6 3 4 Valve contolling ...
Страница 160: ...Copyright Copyright by Eltra GmbH Retsch Allee 1 5 D 42781 Haan Germany ...