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Physical Gas Sensors,purpose the gas to be measured must be sucked in with a pump and fed to the gas sensor via a hose line. Alternatively, the gas can also reach the sensor by diffusion, but this is associated with a considerable time delay. Both types of gas transfer are used in different applications. With optical ga
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Separation Process,ry possible component. For practical reasons, certain applications have therefore been limited to so-called sum parameters. A typical example is the measurement of the sum of all hydrocarbons (THC) with a FID in combustion processes (exhaust gas analysis). In addition, there are also important appli
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IR Absorption Photometer, do this, he let the sunlight pass through a prism and placed a thermometer in each color range. He noticed that beyond the red end of the visible spectrum, the thermometer showed the highest temperature, although no visible radiation was visible there. From the observed temperature rise, he conclud
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UV Absorption Photometer,red to the IR range, however, there are some special features to be considered. Physically, the absorption spectra differ due to additional electronic transitions, since the photon energy in this spectral range is greater than in the IR range. Also, the absorption coefficients in the UV range are us
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Radiation Emission and Laser Technology,rs, or spectrometers, these methods work from the zero point. In absorption measurement, on the other hand, there is a high zero signal (.) at the zero point, which only changes by the amount Δ. caused by the gas concentration . to be measured (Fig. 9.1). For very small gas concentrations (ppm range
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Humidity Measurement in Gases,s referred to as humidity. Gas humidity is the proportion of water for any gas or gas mixture. The water content in solids is described via material moisture and is not dealt with further in this chapter.