Bimetallic thermometer case how to choose?

Bimetallic thermometer case is primarily and bimetallic thermometer used, mainly because the bimetallic thermometer is mainly used in petroleum, chemical industry, heating system, pipelines, power plants, Marine equipment, this equipment is usually more expensive, use cycle is long, but there will be a equipment or technology upgrading, bimetallic thermometer needs to be replaced, if the bimetallic thermometer is directly welded on the device, the replacement cost is high, in such a consideration, many large equipment need to install the bimetallic temperature time, through the bimetallic thermometer cases connect bimetallic thermometer and equipment. The bimetallic thermometer case how to choose? Actually choose bimetallic thermometer sheath mainly focus on three points, the first is qualitative, be sure 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 external thread 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.