Do you know about activity card sets of bimetallic thermometer?

Activity card sets of the characteristics of the bimetallic thermometer is a thread to a certain position on the sheath maerial of fixed and random activity regulating insertion depth when using, to meet different requirements. These series of thermometer is designed for installation in pipelines, ships, factories and machinery; Activity card sets of bimetallic thermometer is a kind of measurement in the field of low temperature test instrument. This kind of bimetallic thermometer can be directly measured in the process of various production - 80 ℃ ~ + 500 ℃ within the scope of liquid, steam and gas medium temperature. Activity card sets of bimetallic thermometer principle structure thread is wound into a form of thermal bimetal as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial. （ Pictures of card set screw thermometer sheath)