Patent ID: 7387764

Claim:
In a contained oxygen analyzing apparatus, which analyzes and outputs an amount of contained oxygen in a sample to be measured by inputting the sample into an analyzing crucible within an analyzing furnace and heating and dissolving the sample, the improvement comprising: a preliminary reducing furnace unit having a preliminary reducing crucible and a power source for preliminarily reducing an oxide film on a surface of the sample by heating the sample to a temperature equal to or less than a melting point in a state of being apart from ambient air, the preliminary reducing furnace having a discharge hole for discharging gases formed in the preliminary reducing furnace; a gas used for the reduction; and a sample inputting unit for inputting the reduced sample to be measured from the preliminary reducing furnace unit into an analyzing crucible via a communication passage, the communication passage configured so that the preliminary reducing furnace and the analyzing crucible communicate in a state where the sample is isolated from ambient air.