The principle of pointer thermometer

Today we are going to learn about the principle of pointer thermometer, bimetallic thermometer and pressure type thermometer are pointer thermometer. Bimetallic thermometer principle is to 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. The principle of pressure type thermometer is based on the sealing temperature measuring system of liquid evaporation changes in the relationship between saturated vapor pressure and temperature, the temperature measurement. Bag when I feel the temperature change when temperature, saturated vapor produced the corresponding pressure in the closed system, cause the change of curvature elastic element, make its produce a shift in the free end, again by the displacement amplification mechanism of gear into the indicated value, the thermometer with a bulb small volume, fast response, high sensitivity, intuitive reading and remote temperature measurement, etc.