Bimetallic thermometer pressure type thermometer belongs to?

Pressure type thermometer and bimetallic thermometer is used to measure the temperature of the measured medium, using the environment is similar. That pressure type thermometer belongs to bimetallic thermometer? Today we will come up from their use principle about it. The working principle of pressure type thermometer is according to the loading container seal of the pressure of heat medium with two temperature changing principle to measure the temperature. It mainly are connected by a spring tube, capillary and constitute of the bulb. Mainly used for remote temperature measurement, the internal and a closed with heat medium system. Bulb under the condition of heat, increase the stress direction along the spring tube in transmission organization leads, the instrument pointer will to a certain extent affect the elastic deformation of the spring pipe, and display the temperature. Bimetallic thermometer working 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. So pressure type thermometer does not belong to the bimetallic thermometer.