As an oxygen concentrator provided with a control means for selecting an optimum purge time that corresponds to the deterioration state of an adsorbent, whereby recovery to an oxygen concentration suitable for treatment is achieved in an extremely short time, an oxygen concentrator is provided that is characterized by: a determination of the moisture-absorption deterioration of the adsorbent being performed when the detection value of an oxygen concentration sensor is at or below the oxygen concentration control value of the concentrated oxygen gas, and the detection value of a pressure sensor is at or above an adsorption pressure at which the oxygen concentration rises significantly before and after a control for shortening the purge time and a control being performed to make the time of the purge step shorter than a set time.提供一種氧濃縮裝置,包含有控制機構,該控制機構藉由選擇因應於吸附劑之劣化狀態的最佳沖放時間,可在極短時間內恢復到適合治療的氧濃度,前述氧濃縮裝置的特徵在於:當氧濃度感測器之檢測值在氧濃縮氣體之氧濃度控制值以下,且壓力感測器之檢測值在縮短沖放時間之控制的前後,氧濃度顯著地上昇之吸附壓以上時,則進行吸附劑之吸濕劣化判定,並且進行使沖放步驟之時間比設定時間縮短的控制。
