IKA C 7010 Operating Instructions Manual

21C7010/12 0508be checked for wear by an expert after each combustion operati-on. The main sealing must be replaced if wear is evident.• Remove the main sealing (item 4) by using a suitable tool topry the O-ring out of the groove in the cover (item 2).• Pull the O-ring toward the side of the cover that is smaller indiameter.Make certain not to damage the cover with tool. This may causethe decomposition vessel to leak. The sealing that has thus beenreplaced may not be reused. Replaced the old sealing with a newone from the set of O-rings.• The new sealing is also mounted on the side of the cover thatis smaller in diameter. Place the O-ring on one side the groove inthe cover.• Use your fingers to pull the O-ring over the edge of the coveruntil it snaps into groove on its own.Perform a leak test after the decomposition vessel has beenassembled.(see capture “Leakage test”)The leak test does not replacepressure testing !Replacing the crucible holderThe crucible holder must be replaced it if has become worn as aresult of the combustion operations.• Open the decomposition vessel as described under „Openingthe decomposition vessel“.• Remove ignition wire and ignition electrode as discribed befo-re.• Unscrew the hexagonal nut (II) adjacent to the inside cover of thecrucible holder in a counterclockwise direction using the SW 5,5double open ended spanner.• Screw the crucible holder out of the cover.Installation of the new crucible holder contained in the set of electro-des with deflector is performed in the reverse order.• Check the decomposition vessel for escaping bubles of oxy-gen.The leak test does not replace pressuretesting !Oxygen valve maintenanceThe oxygen valve is used to fill and emptycthe decomposition ves-sel. It is a non-returnable valve that only closes when the decom-position vessel is full with oxygen.The ignition electrode item 5 serves at the same time as a valvepiston. The sealing surface is in the cover of the decompositionvessel. The O-ring sealing wears through use and because ofaggressive combustion gases, which means that the decomposi-tion vessel may not be tight.Check the sealings for wear in accordance with regular intervalsstipulated by the safety provisions. If the decomposition leaksduring combustion in the calorimeter the escaping oxygen maydamage the decomposition vessel and the calorimeter.• In order to replace the O-ring the ignition electrode must beremoved from the cover as described.• Remove the O-ring item 7 by first pulling the bearing bushing(item 9) off of the ignition electrode and then removing the O-ring.• Place the new O-ring from the set of O-rings onto the ignitionelectrode item 5 from above and then push the bearing bushingitem 9 until it again reaches the ignition electrode.Make certain that the O-ring does not become damaged by sharpedges.After installation of the ignition electrode the bearing bushing isteightened with the hexagonal nut item 6/11 in order to prevent itfrom slipping out of place.Replacing the main sealingThe main sealing item 4 is used to seal off the cover item 2 fromthe bottom part item 1.The main sealing and the sealing surface on the bottom part must