This device passes inactive gas on the oxygen pump which attached the platinum electrode to the oxygen ion conductor, and controls the oxygen concentration in gas. Control of oxygen concentration is controlled by the constant variable type PID feedback circuit which combined the oxygen pump and the oxygen sensor, and the oxygen concentration in inactive gas is controlled and held in the range of 1-10E-30atm (type C circle method).

・Superconductivity substance : development of a new high-temperature superconductivity substance
・Ion conductivity thing : development of a fuel cell (SOFC), etc.
・Oxide semiconductor : development of a solar cell device
・Mixed oxide fuel : safety research of nuclear fuel, etc.