Application of temperature measuring instruments in refractory materials factories
Infrared thermometers are widely used in refractory materials factories due to their high temperature measurement accuracy. Among them, there are many temperature measurement points in the key tunnel kiln. Infrared thermometers have the characteristics of many temperature measurement points and long continuous working time. If the temperature parameters are not well controlled, it will bring significant economic losses to the production enterprise. Therefore, choosing the appropriate temperature measurement method is to ensure the normal operation of the kiln. an important link. There are two traditional temperature measurement methods for tunnel kilns: one is to use thermocouples to measure temperature. This method is characterized by high temperature measurement accuracy and can be connected to a recorder or control system for closed-loop control. Its disadvantage is that it has a short lifespan, especially In high-temperature kilns above 1300°C, the coupling consumption is extremely large, the price is also very expensive, and the equipment operating cost is high; the second method is the optical pyrometer, which measures the temperature based on the color of the object being measured. It does not directly contact the high-temperature area, so it has a long service life, but the measurement accuracy is low, there is no electrical signal output, and it cannot automatically record. It is also affected by human factors and has poor authenticity. The application of HD series infrared thermometer can effectively overcome the above shortcomings. The instrument has high measurement accuracy (up to ±0.5%), and can output electrical signals like a thermocouple for automatic recording and control. It also has a long service life (more than five years), simple operation, and small human error. Etc. Therefore, the HD series infrared thermometer is an ideal temperature measurement instrument for high-temperature tunnel kilns. In the application of HD series infrared thermometers in tunnel kilns, according to different user requirements, there are two commonly used solutions: single-point measurement and multi-point switching temperature measurement. They are introduced as follows:
Single-point temperature measurement system: Each temperature measurement point is composed of a probe and an instrument box, and the temperature measurement unit collects temperature. Then connect the 4~20MA analog signals output from the instrument box of each unit to a multi-point recorder or control actuator, and communicate data with computers, printers and other equipment through the RS-232 port. The temperature measurement unit in this system usually uses the HDIR-2A instrument with higher accuracy and stronger functions.
Switching temperature measurement system: This system performs signal processing by connecting the infrared probe signals installed at each temperature measurement point to an HDMU-2 multi-point thermometer. It also outputs 1~5V temperature signals corresponding to each temperature measurement point for recording by multi-point recorders. At the same time, the temperature data can also be directly input into the computer through the RS232 port for analysis and processing by the computer. It can also be connected to a printer to directly print the temperature data. come out.
Among the above two solutions, the single-point temperature measurement system has an independent temperature measurement and signal processing system for each temperature measurement point, and its output analog and digital signals are real-time continuous signals with fast response speed and can be used as a control system. Real-time control signal of the actuator to achieve closed-loop control. As for the multi-point switching temperature measurement system, although its output analog signal is also continuous, there is a certain lag with the real-time temperature value, so it can only be used for data collection and recording, not as a control signal. Its advantage is that it is cost-effective. , which can reduce equipment costs in situations where usage requirements are not too high.
