Introduction to the Application Range and Working Principle of Thermocouple Thermometers

Introduction to the Application Range and Working Principle of Thermocouple Thermometers

Thermocouples are the most common temperature measuring instruments and have a wide range of applications. However, the market demand is also staggering. So why is this common temperature measuring instrument so attractive? Below, experts from National Energy Instruments will explain the application scope and working principle of thermocouple thermometers.

A thermocouple is a temperature sensing element. It directly measures temperature and converts the temperature signal into a thermoelectric electromotive force signal, which is then converted into the temperature of the measured medium through electrical instruments (secondary instruments). Next, let's understand the working principle and application range of thermocouple thermometers.

1、 The working principle and application range of thermocouple thermometers

The working principle of a thermocouple thermometer is that the wire or thermoelectric electrode is connected to a synthetic circuit at both ends. When the temperature at the junction is different, an electromotive force is generated in the circuit, which is called the thermoelectric effect, and this electromotive force is called the thermal electromotive force. Thermocouples use this principle for temperature measurement, where the end directly used for measuring the temperature of the medium is called the working end (also known as the measurement end), and the other end is called the cold end (also known as the compensation end); The cold end is connected to a display instrument or supporting instrument, and the display instrument will indicate the thermoelectric potential generated by the thermocouple. Guoneng Instrument specializes in producing pressure gauges: pressure gauges, precision pressure gauges, stainless steel pressure gauges, double needle pressure gauges, diaphragm pressure gauges, shockproof pressure gauges, electric contact pressure gauges, explosion-proof electric contact pressure gauges, and other series of pressure gauges.

2、 The application range of thermocouple thermometers

The integrated temperature transmission method using bimetallic thermometers, thermocouples, or thermal resistors not only meets the needs of on-site temperature measurement but also long-distance transmission. It can directly measure the temperature of liquid, steam, gas media, and solid surfaces within the range of -80-+500 ℃ in various production processes.

Purpose: Used to measure various temperature objects, with a wide measurement range, far greater than alcohol and mercury thermometers. It is suitable for high-temperature areas such as steelmaking furnaces and coke ovens, and can also measure low-temperature objects such as liquid hydrogen and liquid nitrogen.

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