Digital temperature sensor chip used in thermometer
A thermometer indicator is a type of thermometer that uses the principle of infrared transmission to sense the surface temperature of an object. It is easy to operate, especially for measuring high-temperature objects. Widely used for measuring surface temperatures of various objects, such as steel casting, furnace temperature, machine parts, glass, and room temperature and body temperature. The infrared thermometer is commonly used.
With the development of science and technology and the needs of modern industrial technology, temperature measurement technology is constantly improving and enhancing. Due to the increasingly wide temperature measurement range, different temperature measuring instruments are manufactured according to different requirements.
Gas thermometer:
Hydrogen or helium is often used as a temperature measuring substance because their liquefaction temperature is very low, close to zero degrees, so their temperature measurement range is very wide. This thermometer has high accuracy and is often used for precise measurements.
Resistance thermometer:
It is divided into metal resistance thermometers and semiconductor resistance thermometers, both of which are made based on the characteristic that the resistance value changes with temperature. Metal thermometers are mainly made of pure metals such as platinum, gold, copper, nickel, as well as rhodium iron and phosphor bronze alloys; Semiconductor thermometers mainly use carbon, germanium, etc. Resistance thermometers are convenient and reliable to use, and have been widely used. Its measurement range is around -260 ℃ to 600 ℃.
Thermocouple thermometer:
It is a widely used temperature measuring instrument in industry. Made using the thermoelectric phenomenon. Two different metal wires are welded together to form the working end, and the other two ends are connected to the measuring instrument to form a circuit. When the working end is placed at the measured temperature and the temperature of the working end is different from that of the free end, an electromotive force will occur, resulting in current passing through the circuit. By measuring electrical quantities and utilizing the temperature at a known location, the temperature at another location can be determined.
High temperature thermometer:
It refers to a thermometer specifically used to measure temperatures above 500 ℃, including optical thermometers, colorimetric thermometers, and radiation thermometers. The principle and structure of high-temperature thermometers are quite complex, and will not be discussed here. Its measurement range is above 500 ℃ to 3000 ℃ and is not suitable for measuring low temperatures.
