Bimetallic thermometer sheath how to choose?

Choose the bimetallic thermometer sheath mainly focus on three points, the first is qualitative, be sure to choose SS304 or SS316 material, this two kinds of stainless steel material is very durable; 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. Why do we need to use the double metal thermometer sheath? Mainly because the bimetallic thermometer is mainly used in petroleum, chemical industry, heating system, pipelines, power plants, Marine equipment, such devices are usually more expensive, use cycle is long, but there will be updated 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, for such reasons, many large equipment need to install the bimetallic temperature time, through the bimetallic thermometer sheath the bimetallic thermometer and equipment connections, so change the thermometer is very convenient and saves cost.