Characteristics of bimetallic thermometers
The advantages of bimetallic thermometers are fast response speed, small size, good linearity, and stability. Some foreign products also have high-temperature working performance.The thermoelectric potential of a bimetallic thermometer is only related to the thermoelectric properties of the thermoelectric electrode material and the temperature difference between the two ends.Using the same homogeneous conductor or semiconductor to form a circuit will not generate thermoelectric potential.The temperature of the two junctions of the thermocouple is T, T0. If T=T0, the thermoelectric potential of the thermocouple is zero. The law of intermediate temperature laid the foundation for the development of thermocouple calibration tables.For many years, scientists have attempted to study whether it is possible to express the relationship between the temperature at the hot end (measuring end) of a thermocouple and the thermoelectric potential generated by the thermocouple circuit using functional relationships or even piecewise functions, but ultimately failed.If two conductors A and B are combined with a third conductor to form a thermoelectric system with a wide temperature measurement range, the physical and chemical properties will be stable for long-term useHigh conductivity and low temperature coefficient of resistance; The configured thermoelectric potential has high sensitivity, with a linear relationship between thermoelectric potential and temperature, easy to replicate, simple process, and low price.But the compensating bridge with matching nickel chromium nickel silicon was mistakenly used, and the balance point of the compensating bridge is 0 º C. When the cold end temperature is 30 º C and the thermometer indicates a temperature of 900 º C, what is the actual temperature of the heating furnace? To determine the temperature dependent components using the standard electrode law.