I Series 51i HCl

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The Model 15i analyzer operates on the principle that hydrogen chloride (HCl) absorbs infrared radiation at a wavelength of 3.4 microns. Because infrared absorption is a nonlinear measurement technique, it is necessary for the instrument electronics to transform the basic analyzer signal into a linear output. The instrument uses an exact calibration curve to accurately linearize the instrument output over any range up to a concentration of 5000ppm in emissions from a source.