1) Regularly purge and clean the sewage outlet; 2) Please read the operation and maintenance manual of the cold dryer carefully, and maintain the cold dryer strictly in accordance with the periodic maintenance methods and measures recommended by the cold dryer manufacturer. 3) 3, the periodic maintenance of the filter is mainly: 4) 1) according to the use of the filter periodically replace the filter element. If you find that the pressure difference of the filter is too large, please replace the filter element in time. 2) Please refer to the filter manufacturer recommended periodic maintenance methods and measures to maintain the filter. 5) Nitrogen production host basically does not need periodic maintenance. The user can check the normal operation of the nitrogen machine when all the equipment is overhauled every year.