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It uses infrared (IR) absorption as its detection method. IR absorption is but a subset of the overall field of “spectroscopy,” which measures the interaction of light and matter.
The basis of absorption spectroscopy is when an electromagnetic wave (i.e., the scientific description of “light”) with a particular wavelength impinges on a substance that absorbs a fraction of the total electromagnetic radiation. The wavelength of radiation is well known, for instance, in differentiating colors in the visible light spectrum.
In the infrared spectral region, the wavelength of light overlaps with discrete absorptions created by molecular vibrations. IR absorption is often used in diagnosing molecular composition based on “fingerprints” of these absorptions over a wide wavelength range. Conversely, if the strength of a single vibrational absorbance is known, a single wavelength is often used to determine the amount of a particular substance. This is how we measure moisture.
The sensor operates on a Coulometric principle. Oxygen in the sample gas is reduced in an electrochemical reaction that results in a measurable current flow. The use of this technique is widely recognized for its ability to provide a precise oxygen measurement.
The sample gas is in direct contact with the sensor cathode. Oxygen in the sample gas is reduced electrochemically at the cathode to hydroxyl ions (OH-).The electrolyte solution contains potassium hydroxide (KOH) which assists in the migration of hydroxyl ions (OH - ) to the anode where they are oxidized to complete the reaction. A voltage of approximately 1.3 VDC, applied to the sensor electrodes, drives the reduction and oxidation reactions. The current flow resulting from the reaction is proportional to the oxygen content in the sample gas. The processed signal is then displayed in ppm or ppb units of oxygen.