The measurement accuracy of flat film and convex film is the same, but there is a difference in the measurement structure. The choice of the two types of diaphragms is mainly based on the different applications. For example, in regular occasions, the material is easy to flow and not easy to crystallize and block. Just use a flat diaphragm. If the measuring medium is easy to crystallize and block, consider the convex diaphragm structure. Of course, we must also consider the installation and pressure pipe issues.