In the process of industrial production and manufacturing, some of the tanks measured are easy to crystallize, highly viscous, extremely corrosive, and easy to solidify. Single and double flange differential pressure transmitters are often used in these occasions. , Such as: tanks, towers, kettles, and tanks in coking plants; liquid storage tanks for the production of evaporator units, liquid level storage tanks for desulfurization and denitrification plants. Both single and double flange brothers have many applications, but they are different from the difference between open and sealed. Single-flange open tanks can be closed tanks, while double flanges have more closed tanks for users.