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The sheath is an important component in all temperature measurement applications, isolating the measurement process from the surrounding environment, not only to protect the environment and workers, but also to separate aggressive, high-pressure, high-flow media from the temperature sensor body, so that users can also change the thermometer during the work process. The sheath is available in a variety of designs and materials to meet all application requirements. When choosing a sheath, users need to pay attention to two important considerations, one is the type of process interface, and the other is the basic manufacturing method. Under normal circumstances, we mainly divide the sheath into threaded type, welded in type and flange type. In addition, the sheath can also be divided into two types of assembled and integrated, assembled sheath is made of pipe, the end of the solid welding closed. The integral sheath is machined from bar material. The JW40 series assembled flange sheathing is suitable for a wide range of electronic and mechanical thermometers manufactured by Ludwig. Designed according to DIN 43772, this series of jackets is suitable for small to medium process load applications and is the first choice for applications in the chemical industry, process technology and equipment manufacturing.