How to choose the bimetallic thermometer heat tube length?

Bimetallic thermometer is a kind of measuring instrument in the field of low temperature detection, it can be directly measured various - in the process of production 80℃- + 500 ℃ within the scope of liquid, steam and gas medium temperature. Is also very convenient to use, as long as inserted the heat pipe can be measured medium, so how to choose the bimetallic thermometer heat tube length? Choose bimetallic temperature heat tube length need to consider several factors. The first is the range of measuring temperature, because the measuring temperature range determines the double the length of the metal sensors ( Double metal sensors installed in the bottom of the heat pipe) , temperature range is relatively narrow, or heat pipe diameter under the condition of relatively fine, bimetallic sensors is longer than the other. In general, from heat tube end, at least 50 mm, that is more than 50 mm length is ok. Second associated with installation of bimetallic thermometer, said pipe using bimetallic thermometer, for example, if the connection pipe installed on the base flange, etc. , or to count all the length of these parts. Third associated with pipe diameter, insert depth at least for more than two-thirds of the pipeline, so WenCai more accurate measurement. So, choose the bimetallic thermometer is important, however, the length of the heat pipe is too long can't install on the device, too short, precision is not allowed.