Bimetallic thermometer, electronic thermometer, pressure type thermometer work secret

Each object in life has its meaning of existence, these vehicles such as cars, trains can bring convenience to our travel, housing can shelter for people,,,,,,,, we all know that the thermometer can measure the temperature, so how is it able to perceive human changes in temperature? The explanation about the several kinds of thermometer work secret: bimetallic thermometer bimetallic thermometer is a kind of measurement in the field of low temperature test instrument. Can be directly measured in the process of various production - 80℃- Liquid + 500 ℃ range steam and gas medium temperature. It is made of round shape into threaded heat dual metallic piece as temperature sensing element, and put it in a protective sleeve, one end fixed ( Fixed end) And the other end, The free end) Connection on a thin shaft, shaft end is equipped with a pointer. When the temperature changes, temperature sensing element of the free end immediately rotation, thus fine axis pointer to produce angular displacement, indicates that the change in temperature on the dial. Due to the temperature sensing element has a linear relation with temperature changes, so the location of the bimetallic thermometer pointer indicated is measured temperature value. The principle of pressure type thermometer 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. When bulb feel 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. Electronic thermometer thermometer according to the principle of the different, divided into the thermocouple thermometer and thermal resistance thermometer. More common is the thermal resistance thermometer. Thermal resistance thermometer is in the low temperature area one of the most commonly used temperature detector. Its main characteristic is high accuracy, stable performance. The platinum thermal resistance measurement accuracy is the highest, it is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument.