Bimetallic thermometer with a protection casing insertion depth of the problem

Bimetallic thermometer is is widely applied in industrial production life of the instrument, can be divided into belt protection and without a protection casing pipe. With a protection casing is commonly used for measuring the temperature of the liquid in the pipeline, then there will be some problems. Is the bimetallic thermometer is installed? How deep should you insert? What the hell to do? Small make up to tell you. Because of the protective casing bimetallic thermometer with heat transfer and heat loss, so the results of the measurement error is inevitable. In order to reduce the measurement error, the bimetallic thermometer should have enough insertion depth. When measuring different pipeline as well as the nature of the liquid does not at the same time, the requirement is not the same. For measuring pipeline fluid temperature at the centre of the bimetallic thermometer, generally should be measuring end is inserted into the pipe center; At this time of the bimetallic thermometer should be installed vertically or tilted. For example, such as flow pipe diameter is 200 mm, the insert depth should choose 100 mm. Then there is the high temperature and high pressure and high velocity of temperature measurement, the main steam temperature. In order to reduce protection casing fluid inside the pipeline resistance and prevent cases break under the action of a fluid, can be taken to protect shallow plug-in mode or use heat pipe. But shallow plug-in protection sleeve, it well into the depth of the steam pipe should be no less than 75 mm; Heat set of the standard type insertion depth is 100 mm. Finally a case is when measuring the original insertion depth of more than 1 m, shall be installed vertically, as far as possible or add racks and protect casing. All in all, want to get more accurate measurement results, will be attention to the problem of insertion depth of the bimetallic thermometer.