Ambient temperature of dowty retarder

The original standard stipulates that the ambient weather temperature used by the dowty retarder is -50~50°C. But in fact, due to the different use locations of various dowty retarder, the ambient temperature that needs to be met is also very different. In order to minimize the cost, all kinds of dowty retarder only need to design and select the hydraulic oil, grease and rubber seal materials according to the ambient temperature of the place where they are used. Therefore, it is not required that each dowty retarder must meet The ambient temperature specified above. Therefore, the new standard cancels the requirement for ambient temperature.