In case of a fault however, a control of the flow rate is no longer possible and the gas flow
fluctuates. This can be caused, for example, by an excessive obstruction of the gas flow system
or by a faulty component that needs to be replaced.
See the next pages of this chapter and chapter 3.1 “Gas flow controller adjustment and
jumper settings”
Mostly, the problem lies in the saturation of the dust trap or of the chemicals.
In case the flow becomes lower and the regulating valve or the pump voltage goes higher
during combustion, it is obvious that the flow regulator is working. Therefore the problem must
be a restricted oxygen supply. When the accelerators start burning they take a lot of oxygen, so
that the pressure in the furnace goes down, and as a result for this the flow may also go down
List of fault reasons in order of probability: (Details to the above points)
1. Blocked metal dust filter
2. Blocked furnace outlet
3. Too low oxygen pressure
4. Blocked lance hole over the crucible.
4. The outlet tap of the oxygen bottle is
not properly open
5. Blocked hole of the ceramic heat
shield
5. A heavy item is placed on the plastic
tube of the oxygen supply
6. Too low oxygen pressure
6. Twisted plastic tube inside the
analyzer
7. The outlet tap of the oxygen bottle is
not properly open
7. Blocked dust filter cartridge
8. Faulty oxygen regulator
9. Contaminated or corroded solenoid
valve
9. Blocked flow sensor assembly
10. Bent plastic tube of oxygen supply
11. A heavy item is placed on the plastic
tube of the oxygen supply
12. Twisted plastic tube inside the
analyzer
13. The oxygen supply is interchanged
with the compressed air supply
14. Blocked dust filter cartridge
15. Blocked flow sensor assembly
Blocked metal dust filter:
Clean the metal dust filter according to the operation manual.
Caution: Even if the filter may be brushed and cleaned in ultrasonic cleaner, some day will not
be able to be cleaned any more. The filter doesn't last forever.
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