How to chuck bimetallic thermometer for routine inspection?

Chuck thermometer apply to live health requirements more stringent environmental measuring, is mainly composed of two kinds of expansion coefficient difference is very big pieces of metal that can be used to directly measure the temperature of the gas, liquid and steam. In usual need daily check the thermometer, and to ensure that when using can't be measurement error. When chuck thermometer for daily check, first of all to wipe the surface, check whether instrument internal water, glass surface dust, watch case is in good condition, whether the thermometer in the oil turbidity, whether affect the value view, whether the instrument range. Chuck thermometer if measurement data error or mistakes, then you need to open it. After disassembly check the thermometer sensor deformation, gauge pointer to loosen, heating or cooling to check, check to see if the temperature changes, whether pointer moving smoothly. Check whether contains a lot of water in the clamp or impurities, and clean or replace.