A. The infra-red (IR) sensor is a transducer for the measurement of the concentration of hydrocarbons by the absorption of infra-red radiation. B. The vapor to be monitored reaches the measuring chamber by diffusion or by means of a pump. C. An infrared source illuminates a volume of gas that has entered inside the measurement chamber. D. The gas absorbs some of the infrared wavelengths as the light passes through it, while others pass through it completely unattenuated. « Previous Next »
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