ANALYZER FOR TRACE OF CARBON IN SAMPLE

摘要

PURPOSE:To reduce the measuring time while enabling accurate and stable measurement, by arranging a gas flow rate adjustor connected to the upstream side of an oxygen gas supply port of a measuring combustion tube and a gas flow rate control valve connected to the downstream side of the measuring combustion tube. CONSTITUTION:One end of a measuring combustion tube 2 forms an opening 2a allowing the entry or withdrawal of a ceramic boat 9 carrying a sample 10 and an oxygen gas is supplied as shown by the direction of the arrow X to burn the sample from an oxygen gas supply port 2b near the opening 2a. Then, by adjusting the amount of oxygen flowing through an oxygen gas flowrate adjustor 5 on the upstream side and a gas flowrate control valve 7 on the downstream side, the amount of oxygen flowing through the oxygen gas supply port 2b is made so larger than the intake of a diaphragm type air pump 6 to always release a part of oxygen inflow into the air from the opening 2b as shown by the arrow X'. Thus, the mixing-in of outside air can be prevented.