Temperature instrumentation is a branch of many instruments, common temperature instruments are glass tube thermometers, bimetal thermometers, pressure thermometers, temperature transmitters, non-contact thermometers, etc. Glass tube thermometer is a kind of thermometer that is widely used, with simple structure, easy to use, high accuracy and low price. The finer the inner diameter of the glass tube thermometer, the more obvious the thermal expansion and contraction, and therefore the more accurate it is. Glass tube thermometers are widely used in chemical, pharmaceutical, brewing, printing and dyeing and machinery manufacturing. At the same time, it is also suitable for temperature measurement in laboratories and laboratories of various scientific research, education and medical institutions. The bimetal thermometer is a combination of two metals with different linear expansion coefficients, one end is fixed, when the temperature changes, the thermal expansion of the two metals is different, driving the pointer to deflect to indicate the temperature. The temperature measurement range of this thermometer is -80~500°C. It is suitable for temperature measurement where industrial precision is not required. A pressure thermometer is a thermometer that measures the temperature based on the relationship between the saturated vapor pressure and the temperature of the evaporated liquid in a closed temperature measurement system. It is mainly composed of a warm bag, a capillary tube and a spring tube. When the temperature change is felt by the temperature bulb, the saturated vapor in the closed system generates the corresponding pressure, which causes the change of the curvature of the elastic element, and causes the displacement of the free end, and then the displacement is changed to the indicated value by the gear amplification mechanism. The temperature transmitter uses thermocouple and thermal resistance as the temperature measurement element, and the output signal from the temperature measuring element is sent to the transmitter module, and after the circuit processing of voltage stabilization filtering, operation amplification, nonlinear correction, V/I conversion, constant current and reverse protection, it is converted into a 4~20mA current signal 0-5V/0-10V voltage signal with a linear relationship with the temperature, and RS485 digital signal output. Temperature transmitters are widely used in petroleum, chemical industry, and chemical fiber; textile, rubber, building materials; electric power, metallurgy, medicine; On-site temperature measurement process control in food and other industrial fields; It is especially suitable for computer measurement and control system, and can also be used with instruments. The non-contact thermometer relies on infrared radiation, brightness, color difference and other methods to sense and compare to obtain the temperature of the measured object. The advantage is that it can be telemetric, has a large measuring range, and can measure extremely high temperature objects. Such as infrared thermometer, brightness thermometer, etc. The disadvantage is that the general accuracy is not high. However, it is indispensable as a factory-aided temperature measuring element.

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