length determines how many molecules are present in the column of gas in the absorption tube.

The intensity of light is converted into a voltage by the detector/preamp module. The voltage is converted into a number by a high resolution A/D (analog-to-digital) converter. The digitized signal, along with the other variables, is used by the CPU to compute the concentration using the above formula.

P/N 06160D DCN6409 Teledyne API Model 465M O3 Monitor Instruction Manual - Page 14

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Teledyne 465M instruction manual