Draeger Evita series ventilators mainly include Evita 2 Dura, Evita 4, Evita XL and etc, with the similar operational principles and main functions. The author summarized the maintenance experiences and analysis mentality in Evita 2 Dura and Evita XL ventilators on the basis of the introdution to the ventilator operational principles. The method that the pneumatic and electronic malfunction were checked step by step was proved helpful for engineers and improved the efficiency.
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