In-depth analysis of the working principle of molten steel temperature meter: how to accurately measure temperature with thermal resistors

As a special equipment, the molten steel thermometer can monitor the temperature of molten steel in real time, thus providing important data support for the subsequent smelting and casting process. This article will explore the working principle of the molten steel thermometer in depth, especially the application of thermal resistors in it.

1. Basic structure

The molten steel thermometer is mainly composed of sensors, displays and data processing units. The sensor is the core part of the thermometer, usually using temperature sensors such as thermal resistors or thermocouples. Thermal resistors are widely used in molten steel temperature measurement due to their high precision and stability.

2. Working principle of thermal resistors

Thermal resistors are sensors that measure temperature by using the property that the resistance of metal changes with temperature. The basic principle is that when the temperature rises, the resistance value of the metal will also increase. The working process of thermal resistors can be divided into the following steps:

1. Temperature change: When the temperature of molten steel changes, the sensing element of the thermal resistor (usually metals such as platinum, copper or nickel) will be affected.

2. Resistance change: As the temperature rises, the resistance value of the thermal resistor will increase.

3. Signal conversion: The resistance change of the thermal resistor is converted into a voltage signal through the circuit. After amplification and processing, this signal can be read by the display or data processing unit.

4. Temperature display: Finally, the processed signal will be converted into a temperature value and displayed in real time on the display.

III. Advantages of thermal resistors

1. High precision: The measurement accuracy of thermal resistors is high, usually up to ±0.1℃, which is suitable for metallurgical processes with strict temperature requirements.

2. Strong stability: Thermal resistors show good stability in long-term use and are not easily affected by the external environment.

3. Linear response: The relationship between the resistance and temperature of the thermal resistor is relatively linear, which is convenient for accurate temperature calculation.

4. High temperature resistance: The thermal resistor can work stably in a high temperature environment and is suitable for the measurement of high-temperature materials such as molten steel.

IV. Application examples

In actual applications, molten steel temperature meters are usually installed in smelting furnaces or casting equipment to monitor the temperature of molten steel in real time. For example, in an electric arc furnace, the temperature of molten steel needs to be kept within a certain range to ensure the smooth progress of the smelting process. Through the precise temperature measurement of the thermal resistor, the operator can adjust the temperature in the furnace in time to avoid smelting quality problems caused by too high or too low temperature.