Help: what kind of bimetallic thermometer sheath is suitable?

Bimetallic thermometer sheath with bimetallic thermometer mainly used in industrial equipment. Because change the bimetallic thermometer directly, it is not, and the cost is relatively high. At that time, a suitable bimetallic thermometer sheath is the first choice, so, what kind of bimetallic thermometer sheath is suitable? 。 Normally, select the bimetallic thermometer sheath is mainly focus on three aspects of the problem, the first is the material, it is important to choose SS304 or SS316 material, these two material is durable, if material is bad, need to replace the sheath is not convenient; The second point is the bimetallic thermometer sheath of the specifications of the female and male must ask clear, or it will affect the installation; The third point is the length of the heat pipe, the length of the heat pipe and the specifications of the internal thread, matching the length of the bimetallic thermometer heat pipe. Choose the suitable bimetallic thermometer sheath, usually also to regular maintenance and cleaning.