The hottest infrared thermometer is widely used in

  • Detail

Infrared thermometers are widely used in glass processing

in the production process of the glass industry, temperature measurement and control is a very important and necessary means. Infrared thermometers are valued for their simple operation, fast response, no aging, small drift, flexible configuration, and will not pollute the glass solution

in the glass industry, it is necessary to measure the temperature of transparent and opaque objects. Opaque objects include molds, domes, and the side walls of glass melting furnaces. As a non-contact temperature measurement object, glass is a transparent visible object, its spectrum is within the near-infrared spectrum range, and its emissivity is related to the wavelength and the thickness of the glass. When the spectral range is 5 ~ 8 μ M, its emissivity is the highest, so the temperature of the glass can be reliably measured in this range. The measured value conforms to the surface temperature of the glass, independent of the thickness of the glass, and there is basically no radiation in this range. In order to avoid the influence of ambient air on the measurement, the thermometer only uses a very narrow infrared spectral band. High quality thermometers only work in the spectral range of the so-called environmental window, because there will not be absorption of infrared rays due to air humidity or carbon oxides, so as to avoid temperature measurement errors caused by changes in air humidity or measurement distance. Narrow band range 5 (about 5 μ m) Used to measure the temperature of the surface

infrared thermometers generally have 5.14 μ The spectral range of M works, because the hot exhaust gas from the burning fire in this area will not affect the measured value. For other applications, it is necessary to measure the temperature inside the glass, because the glass layer close to the surface is greatly affected by convection. What we need to measure here is the melted glass, so we need to use a thermometer in the near-infrared range. Because the penetration depth reached at different wavelengths is also different, the choice of thermometer depends on the layer thickness of the glass. The non-contact temperature measurement technology of glass furnace, tin bath and annealing furnace is increasingly replacing the traditional thermocouple temperature measurement in glass furnace

compared with thermometers, thermocouples will soon age and drift under high operating temperature and aggressive environmental conditions. In order to protect thermocouples, platinum metal is required to be used as a protective shell in some places, so the cost will rise a lot. It is specially used in this field. It does not need the cooling system to work when the ambient temperature reaches 250 ℃. By using the optical fiber pyrometer, the installation and operation costs can be significantly reduced. The optical fiber can be protected by a solid stainless steel shell, and the maximum length can reach 30 meters. Required installation accessories such as installation angle, air cleaner and peep tube (can be used until 1200 ℃)

measurement of glass drops

in principle, the temperature of glass drops can only be obtained through non-contact temperature measurement technology. Because the beat time is very short, Baumert said: "One of the innovative ways is to transfer the products that have been mature in one field to other fields and use the thermometer with fast response time. In addition, it must be able to measure the internal temperature of glass drops. Because the surface temperature of glass is greatly affected by environmental conditions, the measurement of surface temperature will be inaccurate. The penetration depth of glass is determined by the spectral range of the thermometer, and the selection should be based on the type of glass and drops At first, it was decided by the size of the test equipment installed on the aircraft

under normal circumstances, the temperature is maintained and displayed in a short time with the help of the maximum numerical storage force. The digital infrared thermometer measures the internal temperature of glass drops in the automatic glass bottle production line, and the response time is 10 milliseconds. Measurement of glass mold temperature measuring the temperature of glass mold also requires a fast response time, because the glass mold opens and closes at a very fast speed. Because the temperature of metal objects is to be measured here, the spectral sensitivity of the thermometer should be in the short wave infrared range, and the response time should be between 1 and 2 milliseconds. In addition to the measured value output of 0 – 20mA or Ma, the serial interface (RS232 or RS485) can also be selected, so that data processing can be carried out through the computer. The instrument can also choose convenient mounting bracket and cooling cover

temperature measurement in the production of flat glass

for the temperature measurement of flat glass, we also have a suitable spectral range of 5 μ M thermometer, that is, only the surface temperature of glass is measured. In the production line of flat glass, this measurement method is used in tin bath and annealing furnace. As mentioned above, the emissivity is very low in this spectral range, so the radiation of thermal rays will not actually affect the measurement

glass deep processing and bulb production

glass surface temperature is an interesting process parameter in bulb production, bending and annealing of flat glass and hot firing forming process. Here, the temperature measurement should also be independent of the thickness of the glass, so the spectral sensitivity of 5 should also be used μ M thermometer

Copyright © 2011 JIN SHI