Temperature of stainless calender rolls is measured.Stainless steel stainless steel: see steel. stainless steel Any of a family of alloy steels usually containing 10–30% chromium. The presence of chromium, together with low carbon content, gives remarkable resistance to corrosion and heat. calender CALENDER. An almanac. Julius Caesar ordained that the Roman year should consist of 365 days, except every fourth year, which should contain 366, the additional day to be reckoned by counting the twenty-fourth day of February (which was the 6th of the calends of March) twice. rolls are said to be widely used in the rubber and plastics industries. The surface temperature of these rolls is said to be critical to product quality and consistency. Effective temperature control of the surface is said to be achieved through accurate non-contact temperature measurement. Roll temperature monitoring is said to be important to prevent product sticking, and to control the heating process from start up to normal running conditions. Infrared An invisible band of radiation at the lower end of the visible light spectrum. With wavelengths from 750 nm to 1 mm, infrared starts at the end of the microwave spectrum and ends at the beginning of visible light. temperature measurement of shiny rolls is said to be challenging because of the low and varying emissivity Emissivity The ratio of the radiation intensity of a nonblack body to the radiation intensity of a blackbody. This ratio, which is usually designated by the Greek letter ε, is always less than or just equal to one. of the stainless steel surface as a result of aging and surface wear. The company's Pro 42 sensor with auto-null balancing measures low temperatures at short wavelengths to minimize temperature errors due to emissivity variations. These sensors are filtered in the 2.0 to 2.5 micron micron: see micrometer. One micrometer, which is one millionth of a meter or approximately 1/25,000 of an inch. The tiny elements that make up a transistor on a chip are measured in micrometers and nanometers. See process technology. region and are said to be five times less sensitive to emissivity variations than a sensor filtered in the 8 to 14 micron region. Williamson Circle 10 on card |
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