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Teledyne API Model 465L O3 Monitor Operation Manual
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Teledyne API Model 465L O
3
Monitor Manual
05509G DCN6806
The intensity of light is converted into a voltage by a high resolution A/D (analog-
to-digital) converter. The digitized signal and other variables are used by the CPU to
compute the concentration using the above formula.
About every 2.5 seconds the 465L completes a measurement cycle consisting of a 1
second wait period for the sample tube to flush, followed by a 150 ms measurement
of the UV light intensity to obtain I. The sample valve is switched to admit scrubbed
sample gas for 1 second, followed by a 150 ms measurement of the UV light
intensity to obtain Io. Measurement of the Io every 2.5 seconds eliminates
instrument drift due to changing intensity of the lamp caused by aging and dirt.
Содержание 465L
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