Dry weather is the "culprit" of cold
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Platinum-rhodium thermocouples work on the principle that when a platinum-rhodium thermocouple is joined by a conductor of two different components, when the temperature of the two junctions is different, a thermal current is generated in the loop. If there is a temperature difference between the working end of the thermocouple and the reference junction, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. Platinum rhodium thermocouples are used as temperature measuring sensors. They are usually used together with temperature transmitters, regulators and display instruments to form a process control system for directly measuring or controlling fluids in the range of 0-1800 °C in various production processes. Temperatures such as steam and gaseous media as well as solid surfaces. The platinum-rhodium thermocouple uses noble metal high-purity platinum as the negative electrode and platinum-rhodium alloy as the positive electrode. It is used for powder metallurgy, sintering bright furnace, vacuum furnace, smelting furnace and various refractory materials, ceramics and porcelain. The outer tube material is corundum. The measured temperature is 0-1800 °C.
A platinum-iridium thermocouple is a circuit in which a conductor of two different compositions is joined into a loop. When the temperature of the two junctions is different, a thermal current is generated in the loop. If there is a temperature difference between the working end of the thermocouple and the reference junction, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. The thermoelectric heat of the platinum-rhodium thermocouple will increase with the temperature of the measuring end, and its size is only related to the thermocouple material and the temperature at both ends, regardless of the length and diameter of the hot electrode.
Platinum rhodium thermocouple field use matters:
1. When using the compensation wire, it must be noted that the model is matched, the polarity cannot be connected incorrectly, and the temperature of the connection end of the compensation wire and the thermocouple cannot exceed 100 °C.
2. When using a thermocouple with a large time constant to measure temperature or control temperature, although the temperature displayed by the meter fluctuates very little, the fluctuation of the actual furnace temperature may be large. In order to accurately measure the temperature, a thermocouple with a small time constant should be selected.
3. According to the wiring diagram of the instrument, after correct wiring, the meter first displays the thermocouple index number of the meter, then displays the range of the meter range, and then measures the set temperature of the digital tube in the lower row of the meter. The digital tube on the meter displays the measured temperature. .
4. The thermocouple cannot be installed in the area where the measured medium rarely flows. When measuring the temperature of the gas inside the tube with a thermocouple, the thermocouple must be installed against the flow direction and fully in contact with the gas.
5. In order to ensure sufficient heat exchange between the measuring end of the thermocouple and the thermal resistance and the measured medium, the position of the measuring point should be reasonably selected to avoid the valve.
6. According to the law of the intermediate conductor, in the actual temperature measurement application of the thermocouple, the hot end welding and the cold end open circuit are often adopted, and the cold end is connected with the display instrument through the connecting wire to form a temperature measuring system.
The platinum-rhodium thermocouple uses noble metal high-purity platinum as the negative electrode and platinum-rhodium alloy as the positive electrode. It is used for powder metallurgy, sintering bright furnace, vacuum furnace, smelting furnace and various refractory materials, ceramics and porcelain. The outer tube material is corundum. The measured temperature is 0-1800 °C. Platinum rhodium thermocouples are suitable for high temperature applications in various production processes and are widely used in glass and ceramic and industrial salt bath furnaces for temperature measurement.
"The child has been suffering from a cold for more than two weeks. He has a fever and a runny nose. At first, I thought he had a common cold, so I went to the nearby clinic to buy medicine, but it didn't work. Now the child not only coughs, but also has blisters on his mouth and nosebleeds at night. This year has passed without much comfort..." at a maternal and child health care hospital in Chaoyang District, Beijing, The child's parents, Ms. Zhao, said in distress.
According to the pediatrician of the hospital, there is a high incidence of respiratory diseases in children this winter. The main reason is that the weather is dry this year, there is no snow, and there are many bacteria and dust in the air. From the reception situation, the patients are basically mycoplasma infection or chlamydia infection, including many cross infections.
Zhang Xingchao, deputy director of internal medicine of Beijing hospital, introduced that due to the low air humidity, the influenza virus propagates faster in a dry environment and survives on floating dust, which will accelerate the spread of cold. However, due to the failure of "wet deposition", it will also cause serious urban air pollution and easily lead to respiratory diseases such as asthma and pneumonia.
The medical staff of the cardiovascular department of Beijing Municipal People's hospital told reporters that since the beginning of winter, there has been a long drought without rain (snow), the weather is warm and dry, and people's life is irregular during the Spring Festival, resulting in changes in human physiological functions, slow blood flow speed and increased blood viscosity. Middle-aged and elderly patients with hypertension and hyperlipidemia are prone to cerebrovascular spasm, coronary heart disease and other diseases. These diseases have strong concealment, sometimes come quickly and seriously, and are easy to lead to sudden death. Before and after the Spring Festival, the number of middle-aged and elderly patients with cardiovascular disease increased abnormally, especially the elderly over 65 years old.
Wang, director of cardiovascular department of Beijing Municipal People's Hospital, reminded that in the current extremely warm and dry weather environment, the effective way to prevent cardiovascular disease is to drink more water, eat less meat, exercise more and keep warm. Especially the middle-aged and elderly people with "three high" should pay special attention
The excellent performance design of the platinum-iridium thermocouple is safe, reliable and practical. It combines multiple functions and achieves better results.