Temperature Application Highlights

With a continuous heating process, the product is heated as it passes along a conveyor, walking beam, or roller system. In this process, controlling product temperature uniformity is important because variations in the side-to-side temperatures as well as the thermal load can result in inconsistent product quality. For temperature process control, some systems use computer models or thermocouples, but for more accurate and repeatable results, infrared sensors are often used for direct in-zone control as well as furnace entrance and exit temperature measurements.

Solution
For metal applications, short-wavelength, single-wavelength sensors are used within the furnace to minimize sensitivity to emissivity variation, flames, and reflections from hot furnace walls. With furnace entrance and exit measurements, WilliamsonÕs high-performance dual-wavelength sensors are typically used to provide effective compensation for emissivity variance and the formation of scale and oxides. Fast response time and signal conditioning options are available for specific process control requirements.

When heating with quartz lamps or exposed electric heating elements, single-wavelength sensors filtered at wavelengths longer than 4.8 microns are generally used to eliminate the interference of reflected energy. 

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