First of all, the tank liquid for a full range of testing, testing items include: temperature, Ph value, conductivity, solid, acid value and amine value. The test methods are as follows: use Alcohol thermometer to test the bath liquid as needed; test the Ph value in the hot pure water tank and the pure water tank once a day; test the conductivity of the bath liquid once a day with a conductivity meter; The Ed tank and water washing were tested by analytical balance, drying dish, and so on. The ED tank was tested once every 3 days, and the ED tank was tested by 10 ml basic burette and 2-butoxyethanol once a week Once a week, 10 ml acid burette, deionized water, 2-butoxyethanol, etc. are used to test the ED tank. The main points of daily attention to the electrophoresis tank are: 1: In order to prevent the precipitation of the electrophoretic liquid, in peacetime do not electrophoretic coating, but also to open the circulation system to cycle, in the coating operation to be based on the situation to mix periodically, so as not to affect the quality of coating tank liquid precipitation. 2: To control the temperature of the bath within the prescribed range, but also often turn on the electrophoretic fluid heat and cold exchanger. 3: Filter also should often check, check the use of the filter element, dust or sundry, according to the use of the situation should not be regularly replaced. 4: Regular Inspection tank liquid solid content, as the case and timely add paint and water. 5: Control the content of impurity ions in the bath, according to conductivity and Ph detection, through the start of ED refining to remove impurity ions, to ensure the purity of the bath. 6: Regular Detection of certain technological conditions under the swimming penetration, in the process of painting to check the change in the swimming penetration.