The oxygen concentration sensor detects the oxygen concentration as an oxygen concentrator equipped with a control means that recovers the oxygen concentration suitable for treatment in a very short time by selecting the optimal purge time according to the deterioration state of the adsorbent. When the oxygen concentration control value is below the gas oxygen concentration control value and the detection value of the pressure sensor is equal to or higher than the adsorption pressure at which the oxygen concentration significantly increases before and after the control to shorten the purge time, the moisture absorption deterioration determination of the adsorbent is performed, and the purge process time An oxygen concentrator is provided that performs control so that the time is shorter than the set time.吸着剤の劣化状態に応じた最適なパージ時間を選択することで、ごく短い時間で治療に適した酸素濃度まで回復させる制御手段を備えた酸素濃縮装置として、酸素濃度センサの検出値が酸素濃縮ガスの酸素濃度制御値以下、圧力センサの検出値がパージ時間を短縮する制御の前後において酸素濃度が有意に上昇する吸着圧以上である場合に吸着剤の吸湿劣化判定を行い、パージ工程の時間を設定時間よりも短縮する制御を行うことを特徴とする酸素濃縮装置を提供する。
