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  Our high-performance dual-wavelength sensors offer unequalled performance for accurate ａnd repeatable measure-ments on kiln applications. These sensors can operate properly when the target energy signal is diluted over 99% by such things as dust ａnd smoke. To effectively measure targets through flames, the 1400 ａnd 4400 Series are recommended. These single-wavelength sensors utilize a very narrow band 3.8 micron filter that provides unequalled performance with measurements through flames.