Is large oxygen generator belongs to electromechanical equipment why

Large oxygen concentrator is not electromechanical equipment. Class II medical devices, must apply for a registration certificate. 1-2L flow oxygen generator is categorized as mechanical equipment. China's first all computerized process control of large-scale oxygen generator Bensteel four 10,000 cubic meters of oxygen generator completed and put into operation. Its main equipment was introduced from the Federal German Siemens.