The sample gas enters the instrument, absorbs the infrared radiation energy in the center of the 4.67 μm line in the front absorption chamber, and absorbs other radiation energy in the rear absorption chamber. The two chambers have different absorption energy, which destroys the gas in the original absorption chamber and generates pressure pulses with the same amplitude. The changed pressure pulses are applied to the differential thin-film microphone through a capillary tube, which is converted into a change in capacitance, which is then passed through the amplifier Converted to a DC measurement with a proportional concentration.
Convenient folding for long battery life.
fold
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