Electric contact thermometer is bimetallic thermometer?

Electric contact thermometer bimetallic thermometer? This is from the point of view they work. We all know the working principle of bimetallic thermometer is round shape into threaded heat bimetallic strip 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. Electric contact thermometer is the use of lead contact changes when temperature changes, when touch point contact with the upper and lower limits or disconnected at the same time, make the circuit of relay action, to control and alarm automatically. It is mainly used in production field of temperature control and alarm automatically. So the electric contact thermometer also belongs to a kind of bimetallic thermometer.