63
for refineries where the crucible has to be below 60°C when the furnace
opens. So check the configuration file.
2. One other reason is a badly blocked metal filter, perchlorate, copper oxide or
paper filter, so that it takes long for the pressure to escape from the furnace
and consequently, the pressure switch reports with delay low furnace
pressure to the software for opening the furnace.
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Furnace does not open
Pos: 5.46 /0 010 ELTR A/ 0015 s ervic e_i nstr uc tio ns/C S-800 _S ervic e/ 001 5 F ehler /019 515 Mod ul Furn ace do es not ope n ELTR A @ 6\mod_1377688610853_9.docx @ 46747 @ 2 @ 1
Possible reasons:
• See first chapter Furnace opens with delay.
• The outflow valve jams. See chapter Gas flow regulation and see chapter
Solenoid valves cleaning.
• The pressure switch is faulty. See chapter Pressure switch.
• Electronic problem.
When the furnace does not open at the end of analysis, or a closed furnace doesn't
open by pressing F2, there are the following possible reasons for the fault.
The valve V1 cannot open to release the oxygen pressure
In order to verify that, turn the twist grip on top of the dust filter to enable the
oxygen pressure to escape. If then the furnace opens, it is obvious that the
pressure could not be released after the end of analysis resp. after pressing F4.
The valve V1 is energized for releasing the pressure out of the furnace area. See
diagram 12202. When the pressure comes down below 1 bar, the pressure switch
opens, reporting low pressure to the electronics. After a short delay, the pneumatic
valve is deenergized and the furnace piston moves down opening the furnace.
In such case, mostly the plunger of the valve V1 cannot move due to particles
trapped in the valve or due to corrosion. Open and clean the valve or replace it.
The metal dust filter is installed upside down in the metal filter housing.
One more reason could be a completely blocked filter or fully depleted chemicals.
This is however quite unlike to get filters so badly blocked to completely seal the
furnace area, especially from one analysis to the next. In case of very dusty filters
or depleted reagents, the furnace opens with delay.
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